feat: upgrade buttplug package to protocol v4 and WASM v10

Upgrade the buttplug TypeScript client from class-based v3 protocol to interface-based v4 protocol, and the Rust/WASM server from the monolithic buttplug 9.0.9 crate to the split buttplug_core/buttplug_server/ buttplug_server_device_config 10.0.0 crates. TypeScript changes: - Messages are now plain interfaces with msgId()/setMsgId() helpers - ActuatorType → OutputType, SensorType → InputType - ScalarCmd/RotateCmd/LinearCmd → OutputCmd, SensorReadCmd → InputCmd - Client.ts → ButtplugClient.ts, new DeviceCommand/DeviceFeature files - Devices getter returns Map instead of array - Removed class-transformer/reflect-metadata dependencies Rust/WASM changes: - Split imports across buttplug_core, buttplug_server, buttplug_server_device_config - Removed ButtplugServerDowngradeWrapper (use ButtplugServer directly) - Replaced ButtplugFuture/ButtplugFutureStateShared with tokio::sync::oneshot - Updated Hardware::new for new 6-arg signature - Uses git fork (valknarthing/buttplug) to fix missing wasm deps in buttplug_core Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-02-06 14:46:47 +01:00
parent fed2dd65e5
commit 6ea4ed1933
31 changed files with 1763 additions and 2441 deletions
--- a/package.json
+++ b/package.json
@@ -17,8 +17,10 @@
 	"packageManager": "pnpm@10.19.0",
 	"pnpm": {
 		"onlyBuiltDependencies": [
+			"es5-ext",
+			"esbuild",
 			"svelte-preprocess",
-			"vue-demi"
+			"wasm-pack"
 		],
 		"ignoredBuiltDependencies": [
 			"@tailwindcss/oxide",
--- a/packages/buttplug/Cargo.lock
+++ b/packages/buttplug/Cargo.lock
--- a/packages/buttplug/Cargo.toml
+++ b/packages/buttplug/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "buttplug_wasm"
-version = "9.0.9"
+version = "10.0.0"
 authors = ["Nonpolynomial Labs, LLC <kyle@nonpolynomial.com>"]
 description = "WASM Interop for the Buttplug Intimate Hardware Control Library"
 license = "BSD-3-Clause"
@@ -16,9 +16,9 @@ name = "buttplug_wasm"
 path = "src/lib.rs"

 [dependencies]
-buttplug = { version = "9.0.9", default-features = false, features = ["wasm"] }
-# buttplug = { path = "../../../buttplug/buttplug", default-features = false, features = ["wasm"] }
-# buttplug_derive = { path = "../buttplug_derive" }
+buttplug_core = { git = "https://github.com/valknarthing/buttplug.git", default-features = false, features = ["wasm"] }
+buttplug_server = { git = "https://github.com/valknarthing/buttplug.git", default-features = false, features = ["wasm"] }
+buttplug_server_device_config = { git = "https://github.com/valknarthing/buttplug.git" }
 js-sys = "0.3.80"
 tracing-wasm = "0.2.1"
 log-panics = { version = "2.1.0", features = ["with-backtrace"] }
--- a/packages/buttplug/package.json
+++ b/packages/buttplug/package.json
@@ -13,9 +13,7 @@
 		"build:wasm": "wasm-pack build --out-dir wasm --out-name index --target bundler --release"
 	},
 	"dependencies": {
-		"class-transformer": "^0.5.1",
 		"eventemitter3": "^5.0.1",
-		"reflect-metadata": "^0.2.2",
 		"typescript": "^5.9.2",
 		"vite": "^7.1.4",
 		"vite-plugin-wasm": "3.5.0",
--- a/packages/buttplug/src/client/ButtplugBrowserWebsocketClientConnector.ts
+++ b/packages/buttplug/src/client/ButtplugBrowserWebsocketClientConnector.ts
@@ -6,11 +6,11 @@
 * @copyright Copyright (c) Nonpolynomial Labs LLC. All rights reserved.
 */

-"use strict";
+'use strict';

-import { IButtplugClientConnector } from "./IButtplugClientConnector";
-import { ButtplugMessage } from "../core/Messages";
-import { ButtplugBrowserWebsocketConnector } from "../utils/ButtplugBrowserWebsocketConnector";
+import { IButtplugClientConnector } from './IButtplugClientConnector';
+import { ButtplugMessage } from '../core/Messages';
+import { ButtplugBrowserWebsocketConnector } from '../utils/ButtplugBrowserWebsocketConnector';

 export class ButtplugBrowserWebsocketClientConnector
  extends ButtplugBrowserWebsocketConnector
@@ -18,7 +18,7 @@ export class ButtplugBrowserWebsocketClientConnector
 {
  public send = (msg: ButtplugMessage): void => {
    if (!this.Connected) {
-			throw new Error("ButtplugClient not connected");
+      throw new Error('ButtplugClient not connected');
    }
    this.sendMessage(msg);
  };
--- a/packages/buttplug/src/client/ButtplugClient.ts
+++ b/packages/buttplug/src/client/ButtplugClient.ts
@@ -0,0 +1,242 @@
+/*!
+ * Buttplug JS Source Code File - Visit https://buttplug.io for more info about
+ * the project. Licensed under the BSD 3-Clause license. See LICENSE file in the
+ * project root for full license information.
+ *
+ * @copyright Copyright (c) Nonpolynomial Labs LLC. All rights reserved.
+ */
+
+'use strict';
+
+import { ButtplugLogger } from '../core/Logging';
+import { EventEmitter } from 'eventemitter3';
+import { ButtplugClientDevice } from './ButtplugClientDevice';
+import { IButtplugClientConnector } from './IButtplugClientConnector';
+import { ButtplugMessageSorter } from '../utils/ButtplugMessageSorter';
+import * as Messages from '../core/Messages';
+import {
+  ButtplugError,
+  ButtplugInitError,
+  ButtplugMessageError,
+} from '../core/Exceptions';
+import { ButtplugClientConnectorException } from './ButtplugClientConnectorException';
+
+export class ButtplugClient extends EventEmitter {
+  protected _pingTimer: NodeJS.Timeout | null = null;
+  protected _connector: IButtplugClientConnector | null = null;
+  protected _devices: Map<number, ButtplugClientDevice> = new Map();
+  protected _clientName: string;
+  protected _logger = ButtplugLogger.Logger;
+  protected _isScanning = false;
+  private _sorter: ButtplugMessageSorter = new ButtplugMessageSorter(true);
+
+  constructor(clientName = 'Generic Buttplug Client') {
+    super();
+    this._clientName = clientName;
+    this._logger.Debug(`ButtplugClient: Client ${clientName} created.`);
+  }
+
+  public get connected(): boolean {
+    return this._connector !== null && this._connector.Connected;
+  }
+
+  public get devices(): Map<number, ButtplugClientDevice> {
+    // While this function doesn't actually send a message, if we don't have a
+    // connector, we shouldn't have devices.
+    this.checkConnector();
+    return this._devices;
+  }
+
+  public get isScanning(): boolean {
+    return this._isScanning;
+  }
+
+  public connect = async (connector: IButtplugClientConnector) => {
+    this._logger.Info(
+      `ButtplugClient: Connecting using ${connector.constructor.name}`
+    );
+    await connector.connect();
+    this._connector = connector;
+    this._connector.addListener('message', this.parseMessages);
+    this._connector.addListener('disconnect', this.disconnectHandler);
+    await this.initializeConnection();
+  };
+
+  public disconnect = async () => {
+    this._logger.Debug('ButtplugClient: Disconnect called');
+    this._devices.clear();
+    this.checkConnector();
+    await this.shutdownConnection();
+    await this._connector!.disconnect();
+  };
+
+  public startScanning = async () => {
+    this._logger.Debug('ButtplugClient: StartScanning called');
+    this._isScanning = true;
+    await this.sendMsgExpectOk({ StartScanning: { Id: 1 } });
+  };
+
+  public stopScanning = async () => {
+    this._logger.Debug('ButtplugClient: StopScanning called');
+    this._isScanning = false;
+    await this.sendMsgExpectOk({ StopScanning: { Id: 1 } });
+  };
+
+  public stopAllDevices = async () => {
+    this._logger.Debug('ButtplugClient: StopAllDevices');
+    await this.sendMsgExpectOk({ StopCmd: { Id: 1, DeviceIndex: undefined, FeatureIndex: undefined, Inputs: true, Outputs: true } });
+  };
+
+  protected disconnectHandler = () => {
+    this._logger.Info('ButtplugClient: Disconnect event receieved.');
+    this.emit('disconnect');
+  };
+
+  protected parseMessages = (msgs: Messages.ButtplugMessage[]) => {
+    const leftoverMsgs = this._sorter.ParseIncomingMessages(msgs);
+    for (const x of leftoverMsgs) {
+      if (x.DeviceList !== undefined) {
+        this.parseDeviceList(x as Messages.DeviceList);
+        break;
+      } else if (x.ScanningFinished !== undefined) {
+        this._isScanning = false;
+        this.emit('scanningfinished', x);
+      } else if (x.InputReading !== undefined) {
+        // TODO this should be emitted from the device or feature, not the client
+        this.emit('inputreading', x);
+      } else {
+        console.log(`Unhandled message: ${x}`);
+      }
+    }
+  };
+
+  protected initializeConnection = async (): Promise<boolean> => {
+    this.checkConnector();
+    const msg = await this.sendMessage(
+      {
+        RequestServerInfo: {
+          ClientName: this._clientName,
+          Id: 1,
+          ProtocolVersionMajor: Messages.MESSAGE_SPEC_VERSION_MAJOR,
+          ProtocolVersionMinor: Messages.MESSAGE_SPEC_VERSION_MINOR
+        }
+      }
+    );
+    if (msg.ServerInfo !== undefined) {
+      const serverinfo = msg as Messages.ServerInfo;
+      this._logger.Info(
+        `ButtplugClient: Connected to Server ${serverinfo.ServerName}`
+      );
+      // TODO: maybe store server name, do something with message template version?
+      const ping = serverinfo.MaxPingTime;
+      // If the server version is lower than the client version, the server will disconnect here.
+      if (ping > 0) {
+        /*
+        this._pingTimer = setInterval(async () => {
+          // If we've disconnected, stop trying to ping the server.
+          if (!this.Connected) {
+            await this.ShutdownConnection();
+            return;
+          }
+          await this.SendMessage(new Messages.Ping());
+        } , Math.round(ping / 2));
+        */
+      }
+      await this.requestDeviceList();
+      return true;
+    } else if (msg.Error !== undefined) {
+      // Disconnect and throw an exception with the error message we got back.
+      // This will usually only error out if we have a version mismatch that the
+      // server has detected.
+      await this._connector!.disconnect();
+      const err = msg.Error as Messages.Error;
+      throw ButtplugError.LogAndError(
+        ButtplugInitError,
+        this._logger,
+        `Cannot connect to server. ${err.ErrorMessage}`
+      );
+    }
+    return false;
+  }
+
+  private parseDeviceList = (list: Messages.DeviceList) => {
+    for (let [_, d] of Object.entries(list.Devices)) {
+      if (!this._devices.has(d.DeviceIndex)) {
+        const device = ButtplugClientDevice.fromMsg(
+          d,
+          this.sendMessageClosure
+        );
+        this._logger.Debug(`ButtplugClient: Adding Device: ${device}`);
+        this._devices.set(d.DeviceIndex, device);
+        this.emit('deviceadded', device);
+      } else {
+        this._logger.Debug(`ButtplugClient: Device already added: ${d}`);
+      }
+    }
+    for (let [index, device] of this._devices.entries()) {
+      if (!list.Devices.hasOwnProperty(index.toString())) {
+        this._devices.delete(index);
+        this.emit('deviceremoved', device);
+      }
+    }
+  }
+
+  protected requestDeviceList = async () => {
+    this.checkConnector();
+    this._logger.Debug('ButtplugClient: ReceiveDeviceList called');
+    const response = (await this.sendMessage(
+      {
+        RequestDeviceList: { Id: 1 }
+      }
+    ));
+    this.parseDeviceList(response.DeviceList!);
+  };
+
+  protected shutdownConnection = async () => {
+    await this.stopAllDevices();
+    if (this._pingTimer !== null) {
+      clearInterval(this._pingTimer);
+      this._pingTimer = null;
+    }
+  };
+
+  protected async sendMessage(
+    msg: Messages.ButtplugMessage
+  ): Promise<Messages.ButtplugMessage> {
+    this.checkConnector();
+    const p = this._sorter.PrepareOutgoingMessage(msg);
+    await this._connector!.send(msg);
+    return await p;
+  }
+
+  protected checkConnector() {
+    if (!this.connected) {
+      throw new ButtplugClientConnectorException(
+        'ButtplugClient not connected'
+      );
+    }
+  }
+
+  protected sendMsgExpectOk = async (
+    msg: Messages.ButtplugMessage
+  ): Promise<void> => {
+    const response = await this.sendMessage(msg);
+    if (response.Ok !== undefined) {
+      return;
+    } else if (response.Error !== undefined) {
+      throw ButtplugError.FromError(response as Messages.Error);
+    } else {
+      throw ButtplugError.LogAndError(
+        ButtplugMessageError,
+        this._logger,
+        `Message ${response} not handled by SendMsgExpectOk`
+      );
+    }
+  };
+
+  protected sendMessageClosure = async (
+    msg: Messages.ButtplugMessage
+  ): Promise<Messages.ButtplugMessage> => {
+    return await this.sendMessage(msg);
+  };
+}
--- a/packages/buttplug/src/client/ButtplugClientConnectorException.ts
+++ b/packages/buttplug/src/client/ButtplugClientConnectorException.ts
@@ -6,8 +6,8 @@
 * @copyright Copyright (c) Nonpolynomial Labs LLC. All rights reserved.
 */

-import { ButtplugError } from "../core/Exceptions";
-import * as Messages from "../core/Messages";
+import { ButtplugError } from '../core/Exceptions';
+import * as Messages from '../core/Messages';

 export class ButtplugClientConnectorException extends ButtplugError {
  public constructor(message: string) {
--- a/packages/buttplug/src/client/ButtplugClientDevice.ts
+++ b/packages/buttplug/src/client/ButtplugClientDevice.ts
@@ -6,20 +6,24 @@
 * @copyright Copyright (c) Nonpolynomial Labs LLC. All rights reserved.
 */

-"use strict";
-import * as Messages from "../core/Messages";
+'use strict';
+import * as Messages from '../core/Messages';
 import {
  ButtplugDeviceError,
  ButtplugError,
  ButtplugMessageError,
-} from "../core/Exceptions";
-import { EventEmitter } from "eventemitter3";
-import { getMessageClassFromMessage } from "../core/MessageUtils";
+} from '../core/Exceptions';
+import { EventEmitter } from 'eventemitter3';
+import { ButtplugClientDeviceFeature } from './ButtplugClientDeviceFeature';
+import { DeviceOutputCommand } from './ButtplugClientDeviceCommand';

 /**
 * Represents an abstract device, capable of taking certain kinds of messages.
 */
 export class ButtplugClientDevice extends EventEmitter {
+
+  private _features: Map<number, ButtplugClientDeviceFeature>;
+
  /**
   * Return the name of the device.
   */
@@ -48,354 +52,114 @@ export class ButtplugClientDevice extends EventEmitter {
    return this._deviceInfo.DeviceMessageTimingGap;
  }

-	/**
-	 * Return a list of message types the device accepts.
-	 */
-	public get messageAttributes(): Messages.MessageAttributes {
-		return this._deviceInfo.DeviceMessages;
+  public get features(): Map<number, ButtplugClientDeviceFeature> {
+    return this._features;
  }

  public static fromMsg(
    msg: Messages.DeviceInfo,
    sendClosure: (
-			device: ButtplugClientDevice,
-			msg: Messages.ButtplugDeviceMessage,
-		) => Promise<Messages.ButtplugMessage>,
+      msg: Messages.ButtplugMessage
+    ) => Promise<Messages.ButtplugMessage>
  ): ButtplugClientDevice {
    return new ButtplugClientDevice(msg, sendClosure);
  }

-	// Map of messages and their attributes (feature count, etc...)
-	private allowedMsgs: Map<string, Messages.MessageAttributes> = new Map<
-		string,
-		Messages.MessageAttributes
-	>();
-
  /**
   * @param _index Index of the device, as created by the device manager.
   * @param _name Name of the device.
   * @param allowedMsgs Buttplug messages the device can receive.
   */
-	constructor(
+  private constructor(
    private _deviceInfo: Messages.DeviceInfo,
    private _sendClosure: (
-			device: ButtplugClientDevice,
-			msg: Messages.ButtplugDeviceMessage,
-		) => Promise<Messages.ButtplugMessage>,
+      msg: Messages.ButtplugMessage
+    ) => Promise<Messages.ButtplugMessage>
  ) {
    super();
-		_deviceInfo.DeviceMessages.update();
+    this._features = new Map(Object.entries(_deviceInfo.DeviceFeatures).map(([index, v]) => [parseInt(index), new ButtplugClientDeviceFeature(_deviceInfo.DeviceIndex, _deviceInfo.DeviceName, v, _sendClosure)]));
  }

  public async send(
-		msg: Messages.ButtplugDeviceMessage,
+    msg: Messages.ButtplugMessage
  ): Promise<Messages.ButtplugMessage> {
    // Assume we're getting the closure from ButtplugClient, which does all of
    // the index/existence/connection/message checks for us.
-		return await this._sendClosure(this, msg);
+    return await this._sendClosure(msg);
  }

-	public async sendExpectOk(
-		msg: Messages.ButtplugDeviceMessage,
-	): Promise<void> {
+  protected sendMsgExpectOk = async (
+    msg: Messages.ButtplugMessage
+  ): Promise<void> => {
    const response = await this.send(msg);
-		switch (getMessageClassFromMessage(response)) {
-			case Messages.Ok:
+    if (response.Ok !== undefined) {
      return;
-			case Messages.Error:
+    } else if (response.Error !== undefined) {
      throw ButtplugError.FromError(response as Messages.Error);
-			default:
-				throw new ButtplugMessageError(
-					`Message type ${response.constructor} not handled by SendMsgExpectOk`,
-				);
-		}
-	}
-
-	public async scalar(
-		scalar: Messages.ScalarSubcommand | Messages.ScalarSubcommand[],
-	): Promise<void> {
-		if (Array.isArray(scalar)) {
-			await this.sendExpectOk(new Messages.ScalarCmd(scalar, this.index));
    } else {
-			await this.sendExpectOk(new Messages.ScalarCmd([scalar], this.index));
+      /*
+      throw ButtplugError.LogAndError(
+        ButtplugMessageError,
+        this._logger,
+        `Message ${response} not handled by SendMsgExpectOk`
+      );
+      */
+    }
+  };
+
+  protected isOutputValid(featureIndex: number, type: Messages.OutputType) {
+    if (!this._deviceInfo.DeviceFeatures.hasOwnProperty(featureIndex.toString())) {
+      throw new ButtplugDeviceError(`Feature index ${featureIndex} does not exist for device ${this.name}`);
+    }
+    if (this._deviceInfo.DeviceFeatures[featureIndex.toString()].Outputs !== undefined && !this._deviceInfo.DeviceFeatures[featureIndex.toString()].Outputs.hasOwnProperty(type)) {
+      throw new ButtplugDeviceError(`Feature index ${featureIndex} does not support type ${type} for device ${this.name}`);
    }
  }

-	private async scalarCommandBuilder(
-		speed: number | number[],
-		actuator: Messages.ActuatorType,
-	) {
-		const scalarAttrs = this.messageAttributes.ScalarCmd?.filter(
-			(x) => x.ActuatorType === actuator,
-		);
-		if (!scalarAttrs || scalarAttrs.length === 0) {
-			throw new ButtplugDeviceError(
-				`Device ${this.name} has no ${actuator} capabilities`,
-			);
-		}
-		const cmds: Messages.ScalarSubcommand[] = [];
-		if (typeof speed === "number") {
-			scalarAttrs.forEach((x) =>
-				cmds.push(new Messages.ScalarSubcommand(x.Index, speed, actuator)),
-			);
-		} else if (Array.isArray(speed)) {
-			if (speed.length > scalarAttrs.length) {
-				throw new ButtplugDeviceError(
-					`${speed.length} commands send to a device with ${scalarAttrs.length} vibrators`,
-				);
-			}
-			scalarAttrs.forEach((x, i) => {
-				cmds.push(new Messages.ScalarSubcommand(x.Index, speed[i], actuator));
-			});
-		} else {
-			throw new ButtplugDeviceError(
-				`${actuator} can only take numbers or arrays of numbers.`,
-			);
-		}
-		await this.scalar(cmds);
+  public hasOutput(type: Messages.OutputType): boolean {
+    return this._features.values().filter((f) => f.hasOutput(type)).toArray().length > 0;
  }

-	public get vibrateAttributes(): Messages.GenericDeviceMessageAttributes[] {
-		return (
-			this.messageAttributes.ScalarCmd?.filter(
-				(x) => x.ActuatorType === Messages.ActuatorType.Vibrate,
-			) ?? []
-		);
+  public hasInput(type: Messages.InputType): boolean {
+    return this._features.values().filter((f) => f.hasInput(type)).toArray().length > 0;
  }

-	public async vibrate(speed: number | number[]): Promise<void> {
-		await this.scalarCommandBuilder(speed, Messages.ActuatorType.Vibrate);
-	}
-
-	public get oscillateAttributes(): Messages.GenericDeviceMessageAttributes[] {
-		return (
-			this.messageAttributes.ScalarCmd?.filter(
-				(x) => x.ActuatorType === Messages.ActuatorType.Oscillate,
-			) ?? []
-		);
-	}
-
-	public async oscillate(speed: number | number[]): Promise<void> {
-		await this.scalarCommandBuilder(speed, Messages.ActuatorType.Oscillate);
-	}
-
-	public get rotateAttributes(): Messages.GenericDeviceMessageAttributes[] {
-		return this.messageAttributes.RotateCmd ?? [];
-	}
-
-	public async rotate(
-		values: number | [number, boolean][],
-		clockwise?: boolean,
-	): Promise<void> {
-		const rotateAttrs = this.messageAttributes.RotateCmd;
-		if (!rotateAttrs || rotateAttrs.length === 0) {
-			throw new ButtplugDeviceError(
-				`Device ${this.name} has no Rotate capabilities`,
-			);
-		}
-		let msg: Messages.RotateCmd;
-		if (typeof values === "number") {
-			msg = Messages.RotateCmd.Create(
-				this.index,
-				new Array(rotateAttrs.length).fill([values, clockwise]),
-			);
-		} else if (Array.isArray(values)) {
-			msg = Messages.RotateCmd.Create(this.index, values);
-		} else {
-			throw new ButtplugDeviceError(
-				"SendRotateCmd can only take a number and boolean, or an array of number/boolean tuples",
-			);
-		}
-		await this.sendExpectOk(msg);
-	}
-
-	public get linearAttributes(): Messages.GenericDeviceMessageAttributes[] {
-		return this.messageAttributes.LinearCmd ?? [];
-	}
-
-	public async linear(
-		values: number | [number, number][],
-		duration?: number,
-	): Promise<void> {
-		const linearAttrs = this.messageAttributes.LinearCmd;
-		if (!linearAttrs || linearAttrs.length === 0) {
-			throw new ButtplugDeviceError(
-				`Device ${this.name} has no Linear capabilities`,
-			);
-		}
-		let msg: Messages.LinearCmd;
-		if (typeof values === "number") {
-			msg = Messages.LinearCmd.Create(
-				this.index,
-				new Array(linearAttrs.length).fill([values, duration]),
-			);
-		} else if (Array.isArray(values)) {
-			msg = Messages.LinearCmd.Create(this.index, values);
-		} else {
-			throw new ButtplugDeviceError(
-				"SendLinearCmd can only take a number and number, or an array of number/number tuples",
-			);
-		}
-		await this.sendExpectOk(msg);
-	}
-
-	public async sensorRead(
-		sensorIndex: number,
-		sensorType: Messages.SensorType,
-	): Promise<number[]> {
-		const response = await this.send(
-			new Messages.SensorReadCmd(this.index, sensorIndex, sensorType),
-		);
-		switch (getMessageClassFromMessage(response)) {
-			case Messages.SensorReading:
-				return (response as Messages.SensorReading).Data;
-			case Messages.Error:
-				throw ButtplugError.FromError(response as Messages.Error);
-			default:
-				throw new ButtplugMessageError(
-					`Message type ${response.constructor} not handled by sensorRead`,
-				);
+  public async runOutput(cmd: DeviceOutputCommand): Promise<void> {
+    let p: Promise<void>[] = [];
+    for (let f of this._features.values()) {
+      if (f.hasOutput(cmd.outputType)) {
+        p.push(f.runOutput(cmd));
      }
    }
-
-	public get hasBattery(): boolean {
-		const batteryAttrs = this.messageAttributes.SensorReadCmd?.filter(
-			(x) => x.SensorType === Messages.SensorType.Battery,
-		);
-		return batteryAttrs !== undefined && batteryAttrs.length > 0;
+    if (p.length == 0) {
+      return Promise.reject(`No features with output type ${cmd.outputType}`);
    }
-
-	public async battery(): Promise<number> {
-		if (!this.hasBattery) {
-			throw new ButtplugDeviceError(
-				`Device ${this.name} has no Battery capabilities`,
-			);
-		}
-		const batteryAttrs = this.messageAttributes.SensorReadCmd?.filter(
-			(x) => x.SensorType === Messages.SensorType.Battery,
-		);
-		// Find the battery sensor, we'll need its index.
-		const result = await this.sensorRead(
-			batteryAttrs![0].Index,
-			Messages.SensorType.Battery,
-		);
-		return result[0] / 100.0;
-	}
-
-	public get hasRssi(): boolean {
-		const rssiAttrs = this.messageAttributes.SensorReadCmd?.filter(
-			(x) => x.SensorType === Messages.SensorType.RSSI,
-		);
-		return rssiAttrs !== undefined && rssiAttrs.length === 0;
-	}
-
-	public async rssi(): Promise<number> {
-		if (!this.hasRssi) {
-			throw new ButtplugDeviceError(
-				`Device ${this.name} has no RSSI capabilities`,
-			);
-		}
-		const rssiAttrs = this.messageAttributes.SensorReadCmd?.filter(
-			(x) => x.SensorType === Messages.SensorType.RSSI,
-		);
-		// Find the battery sensor, we'll need its index.
-		const result = await this.sensorRead(
-			rssiAttrs![0].Index,
-			Messages.SensorType.RSSI,
-		);
-		return result[0];
-	}
-
-	public async rawRead(
-		endpoint: string,
-		expectedLength: number,
-		timeout: number,
-	): Promise<Uint8Array> {
-		if (!this.messageAttributes.RawReadCmd) {
-			throw new ButtplugDeviceError(
-				`Device ${this.name} has no raw read capabilities`,
-			);
-		}
-		if (this.messageAttributes.RawReadCmd.Endpoints.indexOf(endpoint) === -1) {
-			throw new ButtplugDeviceError(
-				`Device ${this.name} has no raw readable endpoint ${endpoint}`,
-			);
-		}
-		const response = await this.send(
-			new Messages.RawReadCmd(this.index, endpoint, expectedLength, timeout),
-		);
-		switch (getMessageClassFromMessage(response)) {
-			case Messages.RawReading:
-				return new Uint8Array((response as Messages.RawReading).Data);
-			case Messages.Error:
-				throw ButtplugError.FromError(response as Messages.Error);
-			default:
-				throw new ButtplugMessageError(
-					`Message type ${response.constructor} not handled by rawRead`,
-				);
-		}
-	}
-
-	public async rawWrite(
-		endpoint: string,
-		data: Uint8Array,
-		writeWithResponse: boolean,
-	): Promise<void> {
-		if (!this.messageAttributes.RawWriteCmd) {
-			throw new ButtplugDeviceError(
-				`Device ${this.name} has no raw write capabilities`,
-			);
-		}
-		if (this.messageAttributes.RawWriteCmd.Endpoints.indexOf(endpoint) === -1) {
-			throw new ButtplugDeviceError(
-				`Device ${this.name} has no raw writable endpoint ${endpoint}`,
-			);
-		}
-		await this.sendExpectOk(
-			new Messages.RawWriteCmd(this.index, endpoint, data, writeWithResponse),
-		);
-	}
-
-	public async rawSubscribe(endpoint: string): Promise<void> {
-		if (!this.messageAttributes.RawSubscribeCmd) {
-			throw new ButtplugDeviceError(
-				`Device ${this.name} has no raw subscribe capabilities`,
-			);
-		}
-		if (
-			this.messageAttributes.RawSubscribeCmd.Endpoints.indexOf(endpoint) === -1
-		) {
-			throw new ButtplugDeviceError(
-				`Device ${this.name} has no raw subscribable endpoint ${endpoint}`,
-			);
-		}
-		await this.sendExpectOk(new Messages.RawSubscribeCmd(this.index, endpoint));
-	}
-
-	public async rawUnsubscribe(endpoint: string): Promise<void> {
-		// This reuses raw subscribe's info.
-		if (!this.messageAttributes.RawSubscribeCmd) {
-			throw new ButtplugDeviceError(
-				`Device ${this.name} has no raw unsubscribe capabilities`,
-			);
-		}
-		if (
-			this.messageAttributes.RawSubscribeCmd.Endpoints.indexOf(endpoint) === -1
-		) {
-			throw new ButtplugDeviceError(
-				`Device ${this.name} has no raw unsubscribable endpoint ${endpoint}`,
-			);
-		}
-		await this.sendExpectOk(
-			new Messages.RawUnsubscribeCmd(this.index, endpoint),
-		);
+    await Promise.all(p);
  }

  public async stop(): Promise<void> {
-		await this.sendExpectOk(new Messages.StopDeviceCmd(this.index));
+    await this.sendMsgExpectOk({StopCmd: { Id: 1, DeviceIndex: this.index, FeatureIndex: undefined, Inputs: true, Outputs: true}});
+  }
+
+  public async battery(): Promise<number> {
+    let p: Promise<void>[] = [];
+    for (let f of this._features.values()) {
+      if (f.hasInput(Messages.InputType.Battery)) {
+        // Right now, we only have one battery per device, so assume the first one we find is it.
+        let response = await f.runInput(Messages.InputType.Battery, Messages.InputCommandType.Read);
+        if (response === undefined) {
+          throw new ButtplugMessageError("Got incorrect message back.");
+        }
+        if (response.Reading[Messages.InputType.Battery] === undefined) {
+          throw new ButtplugMessageError("Got reading with no Battery info.");
+        }
+        return response.Reading[Messages.InputType.Battery].Value;
+      }
+    }
+    throw new ButtplugDeviceError(`No battery present on this device.`);
  }

  public emitDisconnected() {
-		this.emit("deviceremoved");
+    this.emit('deviceremoved');
  }
 }
--- a/packages/buttplug/src/client/ButtplugClientDeviceCommand.ts
+++ b/packages/buttplug/src/client/ButtplugClientDeviceCommand.ts
@@ -0,0 +1,111 @@
+import { ButtplugDeviceError } from "../core/Exceptions";
+import { OutputType } from "../core/Messages";
+
+class PercentOrSteps {
+  private _percent: number | undefined;
+  private _steps: number | undefined;
+
+  public get percent() {
+    return this._percent;
+  }
+
+  public get steps() {
+    return this._steps;
+  }
+
+  public static createSteps(s: number): PercentOrSteps {
+    let v = new PercentOrSteps;
+    v._steps = s;
+    return v;
+  }
+
+  public static createPercent(p: number): PercentOrSteps {
+    if (p < 0 || p > 1.0) {
+      throw new ButtplugDeviceError(`Percent value ${p} is not in the range 0.0 <= x <= 1.0`);
+    }
+
+    let v = new PercentOrSteps;
+    v._percent = p;
+    return v;
+  }
+}
+
+export class DeviceOutputCommand {
+  public constructor(
+    private _outputType: OutputType,
+    private _value: PercentOrSteps,
+    private _duration?: number,
+  )
+  {}
+
+  public get outputType() {
+    return this._outputType;
+  }
+
+  public get value() {
+    return this._value;
+  }
+
+  public get duration() {
+    return this._duration;
+  }
+}
+
+export class DeviceOutputValueConstructor {
+  public constructor(
+    private _outputType: OutputType)
+  {}
+
+  public steps(steps: number): DeviceOutputCommand {
+    return new DeviceOutputCommand(this._outputType, PercentOrSteps.createSteps(steps), undefined);
+  }
+
+  public percent(percent: number): DeviceOutputCommand {
+    return new DeviceOutputCommand(this._outputType, PercentOrSteps.createPercent(percent), undefined);
+  }
+}
+
+export class DeviceOutputPositionWithDurationConstructor {
+  public steps(steps: number, duration: number): DeviceOutputCommand {
+    return new DeviceOutputCommand(OutputType.Position, PercentOrSteps.createSteps(steps), duration);
+  }
+
+  public percent(percent: number, duration: number): DeviceOutputCommand {
+    return new DeviceOutputCommand(OutputType.HwPositionWithDuration, PercentOrSteps.createPercent(percent), duration);
+  }
+}
+
+export class DeviceOutput {
+  private constructor() {}
+
+  public static get Vibrate() {
+    return new DeviceOutputValueConstructor(OutputType.Vibrate);
+  }
+  public static get Rotate() {
+    return new DeviceOutputValueConstructor(OutputType.Rotate);
+  }
+  public static get Oscillate() {
+    return new DeviceOutputValueConstructor(OutputType.Oscillate);
+  }
+  public static get Constrict() {
+    return new DeviceOutputValueConstructor(OutputType.Constrict);
+  }
+  public static get Inflate() {
+    return new DeviceOutputValueConstructor(OutputType.Inflate);
+  }
+  public static get Temperature() {
+    return new DeviceOutputValueConstructor(OutputType.Temperature);
+  }
+  public static get Led() {
+    return new DeviceOutputValueConstructor(OutputType.Led);
+  }
+  public static get Spray() {
+    return new DeviceOutputValueConstructor(OutputType.Spray);
+  }
+  public static get Position() {
+    return new DeviceOutputValueConstructor(OutputType.Position);
+  }
+  public static get PositionWithDuration() {
+    return new DeviceOutputPositionWithDurationConstructor();
+  }
+}
--- a/packages/buttplug/src/client/ButtplugClientDeviceFeature.ts
+++ b/packages/buttplug/src/client/ButtplugClientDeviceFeature.ts
@@ -0,0 +1,168 @@
+import { ButtplugDeviceError, ButtplugError, ButtplugMessageError } from "../core/Exceptions";
+import * as Messages from "../core/Messages";
+import { DeviceOutputCommand } from "./ButtplugClientDeviceCommand";
+
+export class ButtplugClientDeviceFeature {
+
+  constructor(
+    private _deviceIndex: number,
+    private _deviceName: string,
+    private _feature: Messages.DeviceFeature,
+    private _sendClosure: (
+      msg: Messages.ButtplugMessage
+    ) => Promise<Messages.ButtplugMessage>) {
+  }
+
+  protected send = async (msg: Messages.ButtplugMessage): Promise<Messages.ButtplugMessage> => {
+    return await this._sendClosure(msg);
+  }
+
+  protected sendMsgExpectOk = async (
+    msg: Messages.ButtplugMessage
+  ): Promise<void> => {
+    const response = await this.send(msg);
+    if (response.Ok !== undefined) {
+      return;
+    } else if (response.Error !== undefined) {
+      throw ButtplugError.FromError(response as Messages.Error);
+    } else {
+      throw new ButtplugMessageError("Expected Ok or Error, and didn't get either!");
+    }
+  };
+
+  protected isOutputValid(type: Messages.OutputType) {
+    if (this._feature.Output !== undefined && !this._feature.Output.hasOwnProperty(type)) {
+      throw new ButtplugDeviceError(`Feature index ${this._feature.FeatureIndex} does not support type ${type} for device ${this._deviceName}`);
+    }
+  }
+
+  protected isInputValid(type: Messages.InputType) {
+    if (this._feature.Input !== undefined && !this._feature.Input.hasOwnProperty(type)) {
+      throw new ButtplugDeviceError(`Feature index ${this._feature.FeatureIndex} does not support type ${type} for device ${this._deviceName}`);
+    }
+  }
+
+  protected async sendOutputCmd(command: DeviceOutputCommand): Promise<void> {
+    // Make sure the requested feature is valid
+    this.isOutputValid(command.outputType);
+    if (command.value === undefined) {
+      throw new ButtplugDeviceError(`${command.outputType} requires value defined`);
+    }
+
+    let type = command.outputType;
+    let duration: undefined | number = undefined;
+    if (type == Messages.OutputType.HwPositionWithDuration) {
+      if (command.duration === undefined) {
+        throw new ButtplugDeviceError("PositionWithDuration requires duration defined");
+      }
+      duration = command.duration;
+    }
+    let value: number;
+    let p = command.value;
+    if (p.percent === undefined) {
+      // TODO Check step limits here
+      value = command.value.steps!;
+    } else {
+      value = Math.ceil(this._feature.Output[type]!.Value![1] * p.percent);
+    }
+    let newCommand: Messages.DeviceFeatureOutput = { Value: value, Duration: duration };
+    let outCommand = {};
+    outCommand[type.toString()] = newCommand;
+
+    let cmd: Messages.ButtplugMessage = {
+      OutputCmd: {
+        Id: 1,
+        DeviceIndex: this._deviceIndex,
+        FeatureIndex: this._feature.FeatureIndex,
+        Command: outCommand
+      }
+    };
+    await this.sendMsgExpectOk(cmd);
+  }
+
+  public get featureDescriptor(): string {
+    return this._feature.FeatureDescriptor;
+  }
+
+  public get featureIndex(): number {
+    return this._feature.FeatureIndex;
+  }
+
+  public get outputTypes(): Messages.OutputType[] {
+    if (this._feature.Output === undefined) return [];
+    return Object.keys(this._feature.Output) as Messages.OutputType[];
+  }
+
+  public get inputTypes(): Messages.InputType[] {
+    if (this._feature.Input === undefined) return [];
+    return Object.keys(this._feature.Input) as Messages.InputType[];
+  }
+
+  public outputMaxValue(type: Messages.OutputType): number {
+    if (this._feature.Output === undefined || this._feature.Output[type] === undefined) {
+      return 0;
+    }
+    const val = this._feature.Output[type]!.Value;
+    // Value can arrive as number[] [min, max] from server or as number
+    if (Array.isArray(val)) {
+      return val[val.length - 1];
+    }
+    return val as number;
+  }
+
+  public hasOutput(type: Messages.OutputType): boolean {
+    if (this._feature.Output !== undefined) {
+      return this._feature.Output.hasOwnProperty(type.toString());
+    }
+    return false;
+  }
+
+  public hasInput(type: Messages.InputType): boolean {
+    if (this._feature.Input !== undefined) {
+      return this._feature.Input.hasOwnProperty(type.toString());
+    }
+    return false;
+  }
+
+
+  public async runOutput(cmd: DeviceOutputCommand): Promise<void> {
+    if (this._feature.Output !== undefined && this._feature.Output.hasOwnProperty(cmd.outputType.toString())) {
+      return this.sendOutputCmd(cmd);
+    }
+    throw new ButtplugDeviceError(`Output type ${cmd.outputType} not supported by feature.`);
+  }
+
+  public async runInput(inputType: Messages.InputType, inputCommand: Messages.InputCommandType): Promise<Messages.InputReading | undefined> {
+    // Make sure the requested feature is valid
+    this.isInputValid(inputType);
+    let inputAttributes = this._feature.Input[inputType];
+    console.log(this._feature.Input);
+    if ((inputCommand === Messages.InputCommandType.Unsubscribe && !inputAttributes.Command.includes(Messages.InputCommandType.Subscribe)) && !inputAttributes.Command.includes(inputCommand)) {
+      throw new ButtplugDeviceError(`${inputType} does not support command ${inputCommand}`);
+    }
+
+    let cmd: Messages.ButtplugMessage = {
+      InputCmd: {
+        Id: 1,
+        DeviceIndex: this._deviceIndex,
+        FeatureIndex: this._feature.FeatureIndex,
+        Type: inputType,
+        Command: inputCommand,
+      }
+    };
+    if (inputCommand == Messages.InputCommandType.Read) {
+      const response = await this.send(cmd);
+      if (response.InputReading !== undefined) {
+        return response.InputReading;
+      } else if (response.Error !== undefined) {
+        throw ButtplugError.FromError(response as Messages.Error);
+      } else {
+        throw new ButtplugMessageError("Expected InputReading or Error, and didn't get either!");
+      }
+    } else {
+      console.log(`Sending subscribe message: ${JSON.stringify(cmd)}`);
+      await this.sendMsgExpectOk(cmd);
+      console.log("Got back ok?");
+    }
+  }
+}
--- a/packages/buttplug/src/client/ButtplugNodeWebsocketClientConnector.ts
+++ b/packages/buttplug/src/client/ButtplugNodeWebsocketClientConnector.ts
@@ -6,10 +6,10 @@
 * @copyright Copyright (c) Nonpolynomial Labs LLC. All rights reserved.
 */

-"use strict";
+'use strict';

-import { ButtplugBrowserWebsocketClientConnector } from "./ButtplugBrowserWebsocketClientConnector";
-import { WebSocket as NodeWebSocket } from "ws";
+import { ButtplugBrowserWebsocketClientConnector } from './ButtplugBrowserWebsocketClientConnector';
+import { WebSocket as NodeWebSocket } from 'ws';

 export class ButtplugNodeWebsocketClientConnector extends ButtplugBrowserWebsocketClientConnector {
  protected _websocketConstructor =
--- a/packages/buttplug/src/client/Client.ts
+++ b/packages/buttplug/src/client/Client.ts
@@ -1,276 +0,0 @@
-/*!
- * Buttplug JS Source Code File - Visit https://buttplug.io for more info about
- * the project. Licensed under the BSD 3-Clause license. See LICENSE file in the
- * project root for full license information.
- *
- * @copyright Copyright (c) Nonpolynomial Labs LLC. All rights reserved.
- */
-
-"use strict";
-
-import { ButtplugLogger } from "../core/Logging";
-import { EventEmitter } from "eventemitter3";
-import { ButtplugClientDevice } from "./ButtplugClientDevice";
-import { IButtplugClientConnector } from "./IButtplugClientConnector";
-import { ButtplugMessageSorter } from "../utils/ButtplugMessageSorter";
-
-import * as Messages from "../core/Messages";
-import {
-	ButtplugDeviceError,
-	ButtplugError,
-	ButtplugInitError,
-	ButtplugMessageError,
-} from "../core/Exceptions";
-import { ButtplugClientConnectorException } from "./ButtplugClientConnectorException";
-import { getMessageClassFromMessage } from "../core/MessageUtils";
-
-export class ButtplugClient extends EventEmitter {
-	protected _pingTimer: NodeJS.Timeout | null = null;
-	protected _connector: IButtplugClientConnector | null = null;
-	protected _devices: Map<number, ButtplugClientDevice> = new Map();
-	protected _clientName: string;
-	protected _logger = ButtplugLogger.Logger;
-	protected _isScanning = false;
-	private _sorter: ButtplugMessageSorter = new ButtplugMessageSorter(true);
-
-	constructor(clientName = "Generic Buttplug Client") {
-		super();
-		this._clientName = clientName;
-		this._logger.Debug(`ButtplugClient: Client ${clientName} created.`);
-	}
-
-	public get connected(): boolean {
-		return this._connector !== null && this._connector.Connected;
-	}
-
-	public get devices(): ButtplugClientDevice[] {
-		// While this function doesn't actually send a message, if we don't have a
-		// connector, we shouldn't have devices.
-		this.checkConnector();
-		const devices: ButtplugClientDevice[] = [];
-		this._devices.forEach((d) => {
-			devices.push(d);
-		});
-		return devices;
-	}
-
-	public get isScanning(): boolean {
-		return this._isScanning;
-	}
-
-	public connect = async (connector: IButtplugClientConnector) => {
-		this._logger.Info(
-			`ButtplugClient: Connecting using ${connector.constructor.name}`,
-		);
-		await connector.connect();
-		this._connector = connector;
-		this._connector.addListener("message", this.parseMessages);
-		this._connector.addListener("disconnect", this.disconnectHandler);
-		await this.initializeConnection();
-	};
-
-	public disconnect = async () => {
-		this._logger.Debug("ButtplugClient: Disconnect called");
-		this.checkConnector();
-		await this.shutdownConnection();
-		await this._connector!.disconnect();
-	};
-
-	public startScanning = async () => {
-		this._logger.Debug("ButtplugClient: StartScanning called");
-		this._isScanning = true;
-		await this.sendMsgExpectOk(new Messages.StartScanning());
-	};
-
-	public stopScanning = async () => {
-		this._logger.Debug("ButtplugClient: StopScanning called");
-		this._isScanning = false;
-		await this.sendMsgExpectOk(new Messages.StopScanning());
-	};
-
-	public stopAllDevices = async () => {
-		this._logger.Debug("ButtplugClient: StopAllDevices");
-		await this.sendMsgExpectOk(new Messages.StopAllDevices());
-	};
-
-	private async sendDeviceMessage(
-		device: ButtplugClientDevice,
-		deviceMsg: Messages.ButtplugDeviceMessage,
-	): Promise<Messages.ButtplugMessage> {
-		this.checkConnector();
-		const dev = this._devices.get(device.index);
-		if (dev === undefined) {
-			throw ButtplugError.LogAndError(
-				ButtplugDeviceError,
-				this._logger,
-				`Device ${device.index} not available.`,
-			);
-		}
-		deviceMsg.DeviceIndex = device.index;
-		return await this.sendMessage(deviceMsg);
-	}
-
-	protected disconnectHandler = () => {
-		this._logger.Info("ButtplugClient: Disconnect event receieved.");
-		this.emit("disconnect");
-	};
-
-	protected parseMessages = (msgs: Messages.ButtplugMessage[]) => {
-		const leftoverMsgs = this._sorter.ParseIncomingMessages(msgs);
-		for (const x of leftoverMsgs) {
-			switch (getMessageClassFromMessage(x)) {
-				case Messages.DeviceAdded: {
-					const addedMsg = x as Messages.DeviceAdded;
-					const addedDevice = ButtplugClientDevice.fromMsg(
-						addedMsg,
-						this.sendDeviceMessageClosure,
-					);
-					this._devices.set(addedMsg.DeviceIndex, addedDevice);
-					this.emit("deviceadded", addedMsg, addedDevice);
-					break;
-				}
-				case Messages.DeviceRemoved: {
-					const removedMsg = x as Messages.DeviceRemoved;
-					if (this._devices.has(removedMsg.DeviceIndex)) {
-						const removedDevice = this._devices.get(removedMsg.DeviceIndex);
-						removedDevice?.emitDisconnected();
-						this._devices.delete(removedMsg.DeviceIndex);
-						this.emit("deviceremoved", removedMsg, removedDevice);
-					}
-					break;
-				}
-				case Messages.ScanningFinished:
-					this._isScanning = false;
-					this.emit("scanningfinished", x);
-					break;
-			}
-		}
-	};
-
-	protected initializeConnection = async (): Promise<boolean> => {
-		this.checkConnector();
-		const msg = await this.sendMessage(
-			new Messages.RequestServerInfo(
-				this._clientName,
-				Messages.MESSAGE_SPEC_VERSION,
-			),
-		);
-		switch (getMessageClassFromMessage(msg)) {
-			case Messages.ServerInfo: {
-				const serverinfo = msg as Messages.ServerInfo;
-				this._logger.Info(
-					`ButtplugClient: Connected to Server ${serverinfo.ServerName}`,
-				);
-				// TODO: maybe store server name, do something with message template version?
-				const ping = serverinfo.MaxPingTime;
-				if (serverinfo.MessageVersion < Messages.MESSAGE_SPEC_VERSION) {
-					// Disconnect and throw an exception explaining the version mismatch problem.
-					await this._connector!.disconnect();
-					throw ButtplugError.LogAndError(
-						ButtplugInitError,
-						this._logger,
-						`Server protocol version ${serverinfo.MessageVersion} is older than client protocol version ${Messages.MESSAGE_SPEC_VERSION}. Please update server.`,
-					);
-				}
-				if (ping > 0) {
-					/*
-          this._pingTimer = setInterval(async () => {
-            // If we've disconnected, stop trying to ping the server.
-            if (!this.Connected) {
-              await this.ShutdownConnection();
-              return;
-            }
-            await this.SendMessage(new Messages.Ping());
-          } , Math.round(ping / 2));
-          */
-				}
-				await this.requestDeviceList();
-				return true;
-			}
-			case Messages.Error: {
-				// Disconnect and throw an exception with the error message we got back.
-				// This will usually only error out if we have a version mismatch that the
-				// server has detected.
-				await this._connector!.disconnect();
-				const err = msg as Messages.Error;
-				throw ButtplugError.LogAndError(
-					ButtplugInitError,
-					this._logger,
-					`Cannot connect to server. ${err.ErrorMessage}`,
-				);
-			}
-		}
-		return false;
-	};
-
-	protected requestDeviceList = async () => {
-		this.checkConnector();
-		this._logger.Debug("ButtplugClient: ReceiveDeviceList called");
-		const deviceList = (await this.sendMessage(
-			new Messages.RequestDeviceList(),
-		)) as Messages.DeviceList;
-		deviceList.Devices.forEach((d) => {
-			if (!this._devices.has(d.DeviceIndex)) {
-				const device = ButtplugClientDevice.fromMsg(
-					d,
-					this.sendDeviceMessageClosure,
-				);
-				this._logger.Debug(`ButtplugClient: Adding Device: ${device}`);
-				this._devices.set(d.DeviceIndex, device);
-				this.emit("deviceadded", device);
-			} else {
-				this._logger.Debug(`ButtplugClient: Device already added: ${d}`);
-			}
-		});
-	};
-
-	protected shutdownConnection = async () => {
-		await this.stopAllDevices();
-		if (this._pingTimer !== null) {
-			clearInterval(this._pingTimer);
-			this._pingTimer = null;
-		}
-	};
-
-	protected async sendMessage(
-		msg: Messages.ButtplugMessage,
-	): Promise<Messages.ButtplugMessage> {
-		this.checkConnector();
-		const p = this._sorter.PrepareOutgoingMessage(msg);
-		await this._connector!.send(msg);
-		return await p;
-	}
-
-	protected checkConnector() {
-		if (!this.connected) {
-			throw new ButtplugClientConnectorException(
-				"ButtplugClient not connected",
-			);
-		}
-	}
-
-	protected sendMsgExpectOk = async (
-		msg: Messages.ButtplugMessage,
-	): Promise<void> => {
-		const response = await this.sendMessage(msg);
-		switch (getMessageClassFromMessage(response)) {
-			case Messages.Ok:
-				return;
-			case Messages.Error:
-				throw ButtplugError.FromError(response as Messages.Error);
-			default:
-				throw ButtplugError.LogAndError(
-					ButtplugMessageError,
-					this._logger,
-					`Message type ${getMessageClassFromMessage(response)!.constructor} not handled by SendMsgExpectOk`,
-				);
-		}
-	};
-
-	protected sendDeviceMessageClosure = async (
-		device: ButtplugClientDevice,
-		msg: Messages.ButtplugDeviceMessage,
-	): Promise<Messages.ButtplugMessage> => {
-		return await this.sendDeviceMessage(device, msg);
-	};
-}
--- a/packages/buttplug/src/client/IButtplugClientConnector.ts
+++ b/packages/buttplug/src/client/IButtplugClientConnector.ts
@@ -6,8 +6,8 @@
 * @copyright Copyright (c) Nonpolynomial Labs LLC. All rights reserved.
 */

-import { ButtplugMessage } from "../core/Messages";
-import { EventEmitter } from "eventemitter3";
+import { ButtplugMessage } from '../core/Messages';
+import { EventEmitter } from 'eventemitter3';

 export interface IButtplugClientConnector extends EventEmitter {
  connect: () => Promise<void>;
--- a/packages/buttplug/src/core/Exceptions.ts
+++ b/packages/buttplug/src/core/Exceptions.ts
@@ -6,8 +6,8 @@
 * @copyright Copyright (c) Nonpolynomial Labs LLC. All rights reserved.
 */

-import * as Messages from "./Messages";
-import { ButtplugLogger } from "./Logging";
+import * as Messages from './Messages';
+import { ButtplugLogger } from './Logging';

 export class ButtplugError extends Error {
  public get ErrorClass(): Messages.ErrorClass {
@@ -23,14 +23,20 @@ export class ButtplugError extends Error {
  }

  public get ErrorMessage(): Messages.ButtplugMessage {
-		return new Messages.Error(this.message, this.ErrorClass, this.Id);
+    return {
+      Error: {
+        Id: this.Id,
+        ErrorCode: this.ErrorClass,
+        ErrorMessage: this.message
+      }
+    }
  }

  public static LogAndError<T extends ButtplugError>(
    constructor: new (str: string, num: number) => T,
    logger: ButtplugLogger,
    message: string,
-		id: number = Messages.SYSTEM_MESSAGE_ID,
+    id: number = Messages.SYSTEM_MESSAGE_ID
  ): T {
    logger.Error(message);
    return new constructor(message, id);
@@ -61,7 +67,7 @@ export class ButtplugError extends Error {
    message: string,
    errorClass: Messages.ErrorClass,
    id: number = Messages.SYSTEM_MESSAGE_ID,
-		inner?: Error,
+    inner?: Error
  ) {
    super(message);
    this.errorClass = errorClass;
--- a/packages/buttplug/src/core/Logging.ts
+++ b/packages/buttplug/src/core/Logging.ts
@@ -6,7 +6,7 @@
 * @copyright Copyright (c) Nonpolynomial Labs LLC. All rights reserved.
 */

-import { EventEmitter } from "eventemitter3";
+import { EventEmitter } from 'eventemitter3';

 export enum ButtplugLogLevel {
  Off,
@@ -69,7 +69,9 @@ export class LogMessage {
   * Returns a formatted string with timestamp, level, and message.
   */
  public get FormattedMessage() {
-		return `${ButtplugLogLevel[this.logLevel]} : ${this.timestamp} : ${this.logMessage}`;
+    return `${ButtplugLogLevel[this.logLevel]} : ${this.timestamp} : ${
+      this.logMessage
+    }`;
  }
 }

@@ -189,7 +191,7 @@ export class ButtplugLogger extends EventEmitter {
      console.log(logMsg.FormattedMessage);
    }
    if (level <= this.maximumEventLogLevel) {
-			this.emit("log", logMsg);
+      this.emit('log', logMsg);
    }
  }
 }
--- a/packages/buttplug/src/core/MessageUtils.ts
+++ b/packages/buttplug/src/core/MessageUtils.ts
@@ -1,48 +0,0 @@
-/*!
- * Buttplug JS Source Code File - Visit https://buttplug.io for more info about
- * the project. Licensed under the BSD 3-Clause license. See LICENSE file in the
- * project root for full license information.
- *
- * @copyright Copyright (c) Nonpolynomial Labs LLC. All rights reserved.
- */
-
-"use strict";
-import { plainToInstance } from "class-transformer";
-import * as Messages from "./Messages";
-
-function getMessageClass(
-	type: string,
-): (new (...args: unknown[]) => Messages.ButtplugMessage) | null {
-	for (const value of Object.values(Messages)) {
-		if (typeof value === "function" && "Name" in value && value.Name === type) {
-			return value;
-		}
-	}
-	return null;
-}
-
-export function getMessageClassFromMessage(
-	msg: Messages.ButtplugMessage,
-): (new (...args: unknown[]) => Messages.ButtplugMessage) | null {
-	// Making the bold assumption all message classes have the Name static. Should define a
-	// requirement for this in the abstract class.
-	return getMessageClass(Object.getPrototypeOf(msg).constructor.Name);
-}
-
-export function fromJSON(str): Messages.ButtplugMessage[] {
-	const msgarray: object[] = JSON.parse(str);
-	const msgs: Messages.ButtplugMessage[] = [];
-	for (const x of Array.from(msgarray)) {
-		const type = Object.getOwnPropertyNames(x)[0];
-		const cls = getMessageClass(type);
-		if (cls) {
-			const msg = plainToInstance<Messages.ButtplugMessage, unknown>(
-				cls,
-				x[type],
-			);
-			msg.update();
-			msgs.push(msg);
-		}
-	}
-	return msgs;
-}
--- a/packages/buttplug/src/core/Messages.ts
+++ b/packages/buttplug/src/core/Messages.ts
@@ -7,136 +7,59 @@
 */

 // tslint:disable:max-classes-per-file
-"use strict";
+'use strict';

-import { instanceToPlain, Type } from "class-transformer";
-import "reflect-metadata";
+import { ButtplugMessageError } from './Exceptions';

 export const SYSTEM_MESSAGE_ID = 0;
 export const DEFAULT_MESSAGE_ID = 1;
 export const MAX_ID = 4294967295;
-export const MESSAGE_SPEC_VERSION = 3;
+export const MESSAGE_SPEC_VERSION_MAJOR = 4;
+export const MESSAGE_SPEC_VERSION_MINOR = 0;

-export class MessageAttributes {
-	public ScalarCmd?: Array<GenericDeviceMessageAttributes>;
-	public RotateCmd?: Array<GenericDeviceMessageAttributes>;
-	public LinearCmd?: Array<GenericDeviceMessageAttributes>;
-	public RawReadCmd?: RawDeviceMessageAttributes;
-	public RawWriteCmd?: RawDeviceMessageAttributes;
-	public RawSubscribeCmd?: RawDeviceMessageAttributes;
-	public SensorReadCmd?: Array<SensorDeviceMessageAttributes>;
-	public SensorSubscribeCmd?: Array<SensorDeviceMessageAttributes>;
-	public StopDeviceCmd: {};
-
-	constructor(data: Partial<MessageAttributes>) {
-		Object.assign(this, data);
+// Base message interfaces
+export interface ButtplugMessage {
+  Ok?: Ok;
+  Ping?: Ping;
+  Error?: Error;
+  RequestServerInfo?: RequestServerInfo;
+  ServerInfo?: ServerInfo;
+  RequestDeviceList?: RequestDeviceList;
+  StartScanning?: StartScanning;
+  StopScanning?: StopScanning;
+  ScanningFinished?: ScanningFinished;
+  StopCmd?: StopCmd;
+  InputCmd?: InputCmd;
+  InputReading?: InputReading;
+  OutputCmd?: OutputCmd;
+  DeviceList?: DeviceList;
 }

-	public update() {
-		this.ScalarCmd?.forEach((x, i) => (x.Index = i));
-		this.RotateCmd?.forEach((x, i) => (x.Index = i));
-		this.LinearCmd?.forEach((x, i) => (x.Index = i));
-		this.SensorReadCmd?.forEach((x, i) => (x.Index = i));
-		this.SensorSubscribeCmd?.forEach((x, i) => (x.Index = i));
+export function msgId(msg: ButtplugMessage): number {
+  for (let [_, entry] of Object.entries(msg)) {
+    if (entry != undefined) {
+      return entry.Id;
    }
  }
+  throw new ButtplugMessageError(`Message ${msg} does not have an ID.`);
+}

-export enum ActuatorType {
-	Unknown = "Unknown",
-	Vibrate = "Vibrate",
-	Rotate = "Rotate",
-	Oscillate = "Oscillate",
-	Constrict = "Constrict",
-	Inflate = "Inflate",
-	Position = "Position",
+export function setMsgId(msg: ButtplugMessage, id: number) {
+  for (let [_, entry] of Object.entries(msg)) {
+    if (entry != undefined) {
+      entry.Id = id;
+      return;
+    }
+  }
+  throw new ButtplugMessageError(`Message ${msg} does not have an ID.`);
 }

-export enum SensorType {
-	Unknown = "Unknown",
-	Battery = "Battery",
-	RSSI = "RSSI",
-	Button = "Button",
-	Pressure = "Pressure",
-	// Temperature,
-	// Accelerometer,
-	// Gyro,
+export interface Ok {
+  Id: number | undefined;
 }

-export class GenericDeviceMessageAttributes {
-	public FeatureDescriptor: string;
-	public ActuatorType: ActuatorType;
-	public StepCount: number;
-	public Index = 0;
-	constructor(data: Partial<GenericDeviceMessageAttributes>) {
-		Object.assign(this, data);
-	}
-}
-
-export class RawDeviceMessageAttributes {
-	constructor(public Endpoints: Array<string>) {}
-}
-
-export class SensorDeviceMessageAttributes {
-	public FeatureDescriptor: string;
-	public SensorType: SensorType;
-	public StepRange: Array<number>;
-	public Index = 0;
-	constructor(data: Partial<GenericDeviceMessageAttributes>) {
-		Object.assign(this, data);
-	}
-}
-
-export abstract class ButtplugMessage {
-	constructor(public Id: number) {}
-
-	// tslint:disable-next-line:ban-types
-	public get Type(): Function {
-		return this.constructor;
-	}
-
-	public toJSON(): string {
-		return JSON.stringify(this.toProtocolFormat());
-	}
-
-	public toProtocolFormat(): object {
-		const jsonObj = {};
-		jsonObj[(this.constructor as unknown as { Name: string }).Name] =
-			instanceToPlain(this);
-		return jsonObj;
-	}
-
-	public update() {}
-}
-
-export abstract class ButtplugDeviceMessage extends ButtplugMessage {
-	constructor(
-		public DeviceIndex: number,
-		public Id: number,
-	) {
-		super(Id);
-	}
-}
-
-export abstract class ButtplugSystemMessage extends ButtplugMessage {
-	constructor(public Id: number = SYSTEM_MESSAGE_ID) {
-		super(Id);
-	}
-}
-
-export class Ok extends ButtplugSystemMessage {
-	static Name = "Ok";
-
-	constructor(public Id: number = DEFAULT_MESSAGE_ID) {
-		super(Id);
-	}
-}
-
-export class Ping extends ButtplugMessage {
-	static Name = "Ping";
-
-	constructor(public Id: number = DEFAULT_MESSAGE_ID) {
-		super(Id);
-	}
+export interface Ping {
+  Id: number | undefined;
 }

 export enum ErrorClass {
@@ -147,345 +70,140 @@ export enum ErrorClass {
  ERROR_DEVICE,
 }

-export class Error extends ButtplugMessage {
-	static Name = "Error";
-
-	constructor(
-		public ErrorMessage: string,
-		public ErrorCode: ErrorClass = ErrorClass.ERROR_UNKNOWN,
-		public Id: number = DEFAULT_MESSAGE_ID,
-	) {
-		super(Id);
+export interface Error {
+  ErrorMessage: string;
+  ErrorCode: ErrorClass;
+  Id: number | undefined;
 }

-	get Schemversion() {
-		return 0;
-	}
+export interface RequestDeviceList {
+  Id: number | undefined;
 }

-export class DeviceInfo {
-	public DeviceIndex: number;
-	public DeviceName: string;
-	@Type(() => MessageAttributes)
-	public DeviceMessages: MessageAttributes;
-	public DeviceDisplayName?: string;
-	public DeviceMessageTimingGap?: number;
-
-	constructor(data: Partial<DeviceInfo>) {
-		Object.assign(this, data);
-	}
+export interface StartScanning {
+  Id: number | undefined;
 }

-export class DeviceList extends ButtplugMessage {
-	static Name = "DeviceList";
-
-	@Type(() => DeviceInfo)
-	public Devices: DeviceInfo[];
-	public Id: number;
-
-	constructor(devices: DeviceInfo[], id: number = DEFAULT_MESSAGE_ID) {
-		super(id);
-		this.Devices = devices;
-		this.Id = id;
+export interface StopScanning {
+  Id: number | undefined;
 }

-	public update() {
-		for (const device of this.Devices) {
-			device.DeviceMessages.update();
-		}
-	}
+export interface StopAllDevices {
+  Id: number | undefined;
 }

-export class DeviceAdded extends ButtplugSystemMessage {
-	static Name = "DeviceAdded";
-
-	public DeviceIndex: number;
-	public DeviceName: string;
-	@Type(() => MessageAttributes)
-	public DeviceMessages: MessageAttributes;
-	public DeviceDisplayName?: string;
-	public DeviceMessageTimingGap?: number;
-
-	constructor(data: Partial<DeviceAdded>) {
-		super();
-		Object.assign(this, data);
+export interface ScanningFinished {
+  Id: number | undefined;
 }

-	public update() {
-		this.DeviceMessages.update();
-	}
+export interface RequestServerInfo {
+  ClientName: string;
+  ProtocolVersionMajor: number;
+  ProtocolVersionMinor: number;
+  Id: number | undefined;
 }

-export class DeviceRemoved extends ButtplugSystemMessage {
-	static Name = "DeviceRemoved";
-
-	constructor(public DeviceIndex: number) {
-		super();
-	}
+export interface ServerInfo {
+  MaxPingTime: number;
+  ServerName: string;
+  ProtocolVersionMajor: number;
+  ProtocolVersionMinor: number;
+  Id: number | undefined;
 }

-export class RequestDeviceList extends ButtplugMessage {
-	static Name = "RequestDeviceList";
-
-	constructor(public Id: number = DEFAULT_MESSAGE_ID) {
-		super(Id);
-	}
+export interface DeviceFeature {
+  FeatureDescriptor: string;
+  Output: { [key: string]: DeviceFeatureOutput };
+  Input: { [key: string]: DeviceFeatureInput };
+  FeatureIndex: number;
 }

-export class StartScanning extends ButtplugMessage {
-	static Name = "StartScanning";
-
-	constructor(public Id: number = DEFAULT_MESSAGE_ID) {
-		super(Id);
-	}
+export interface DeviceInfo {
+  DeviceIndex: number;
+  DeviceName: string;
+  DeviceFeatures: { [key: number]: DeviceFeature };
+  DeviceDisplayName?: string;
+  DeviceMessageTimingGap?: number;
 }

-export class StopScanning extends ButtplugMessage {
-	static Name = "StopScanning";
-
-	constructor(public Id: number = DEFAULT_MESSAGE_ID) {
-		super(Id);
-	}
+export interface DeviceList {
+  Devices: { [key: number]: DeviceInfo };
+  Id: number | undefined;
 }

-export class ScanningFinished extends ButtplugSystemMessage {
-	static Name = "ScanningFinished";
-
-	constructor() {
-		super();
-	}
+export enum OutputType {
+  Unknown = 'Unknown',
+  Vibrate = 'Vibrate',
+  Rotate = 'Rotate',
+  Oscillate = 'Oscillate',
+  Constrict = 'Constrict',
+  Inflate = 'Inflate',
+  Position = 'Position',
+  HwPositionWithDuration = 'HwPositionWithDuration',
+  Temperature = 'Temperature',
+  Spray = 'Spray',
+  Led = 'Led',
 }

-export class RequestServerInfo extends ButtplugMessage {
-	static Name = "RequestServerInfo";
-
-	constructor(
-		public ClientName: string,
-		public MessageVersion: number = 0,
-		public Id: number = DEFAULT_MESSAGE_ID,
-	) {
-		super(Id);
-	}
+export enum InputType {
+  Unknown = 'Unknown',
+  Battery = 'Battery',
+  RSSI = 'RSSI',
+  Button = 'Button',
+  Pressure = 'Pressure',
+  // Temperature,
+  // Accelerometer,
+  // Gyro,
 }

-export class ServerInfo extends ButtplugSystemMessage {
-	static Name = "ServerInfo";
-
-	constructor(
-		public MessageVersion: number,
-		public MaxPingTime: number,
-		public ServerName: string,
-		public Id: number = DEFAULT_MESSAGE_ID,
-	) {
-		super();
-	}
+export enum InputCommandType {
+  Read = 'Read',
+  Subscribe = 'Subscribe',
+  Unsubscribe = 'Unsubscribe',
 }

-export class StopDeviceCmd extends ButtplugDeviceMessage {
-	static Name = "StopDeviceCmd";
-
-	constructor(
-		public DeviceIndex: number = -1,
-		public Id: number = DEFAULT_MESSAGE_ID,
-	) {
-		super(DeviceIndex, Id);
-	}
+export interface DeviceFeatureInput {
+  Value: number[];
+  Command: InputCommandType[];
 }

-export class StopAllDevices extends ButtplugMessage {
-	static Name = "StopAllDevices";
-
-	constructor(public Id: number = DEFAULT_MESSAGE_ID) {
-		super(Id);
-	}
+export interface DeviceFeatureOutput {
+  Value: number;
+  Duration?: number;
 }

-export class GenericMessageSubcommand {
-	protected constructor(public Index: number) {}
+export interface OutputCmd {
+  DeviceIndex: number;
+  FeatureIndex: number;
+  Command: { [key: string]: DeviceFeatureOutput };
+  Id: number | undefined;
 }

-export class ScalarSubcommand extends GenericMessageSubcommand {
-	constructor(
-		Index: number,
-		public Scalar: number,
-		public ActuatorType: ActuatorType,
-	) {
-		super(Index);
-	}
+// Device Input Commands
+
+export interface InputCmd {
+  DeviceIndex: number;
+  FeatureIndex: number;
+  Type: InputType;
+  Command: InputCommandType;
+  Id: number | undefined;
 }

-export class ScalarCmd extends ButtplugDeviceMessage {
-	static Name = "ScalarCmd";
-
-	constructor(
-		public Scalars: ScalarSubcommand[],
-		public DeviceIndex: number = -1,
-		public Id: number = DEFAULT_MESSAGE_ID,
-	) {
-		super(DeviceIndex, Id);
-	}
+export interface InputValue {
+  Value: number;
 }

-export class RotateSubcommand extends GenericMessageSubcommand {
-	constructor(
-		Index: number,
-		public Speed: number,
-		public Clockwise: boolean,
-	) {
-		super(Index);
-	}
+export interface InputReading {
+  DeviceIndex: number;
+  FeatureIndex: number;
+  Reading: { [key: string]: InputValue };
+  Id: number | undefined;
 }

-export class RotateCmd extends ButtplugDeviceMessage {
-	static Name = "RotateCmd";
-
-	public static Create(
-		deviceIndex: number,
-		commands: [number, boolean][],
-	): RotateCmd {
-		const cmdList: RotateSubcommand[] = new Array<RotateSubcommand>();
-
-		let i = 0;
-		for (const [speed, clockwise] of commands) {
-			cmdList.push(new RotateSubcommand(i, speed, clockwise));
-			++i;
-		}
-
-		return new RotateCmd(cmdList, deviceIndex);
-	}
-	constructor(
-		public Rotations: RotateSubcommand[],
-		public DeviceIndex: number = -1,
-		public Id: number = DEFAULT_MESSAGE_ID,
-	) {
-		super(DeviceIndex, Id);
-	}
-}
-
-export class VectorSubcommand extends GenericMessageSubcommand {
-	constructor(
-		Index: number,
-		public Position: number,
-		public Duration: number,
-	) {
-		super(Index);
-	}
-}
-
-export class LinearCmd extends ButtplugDeviceMessage {
-	static Name = "LinearCmd";
-
-	public static Create(
-		deviceIndex: number,
-		commands: [number, number][],
-	): LinearCmd {
-		const cmdList: VectorSubcommand[] = new Array<VectorSubcommand>();
-
-		let i = 0;
-		for (const cmd of commands) {
-			cmdList.push(new VectorSubcommand(i, cmd[0], cmd[1]));
-			++i;
-		}
-
-		return new LinearCmd(cmdList, deviceIndex);
-	}
-	constructor(
-		public Vectors: VectorSubcommand[],
-		public DeviceIndex: number = -1,
-		public Id: number = DEFAULT_MESSAGE_ID,
-	) {
-		super(DeviceIndex, Id);
-	}
-}
-
-export class SensorReadCmd extends ButtplugDeviceMessage {
-	static Name = "SensorReadCmd";
-
-	constructor(
-		public DeviceIndex: number,
-		public SensorIndex: number,
-		public SensorType: SensorType,
-		public Id: number = DEFAULT_MESSAGE_ID,
-	) {
-		super(DeviceIndex, Id);
-	}
-}
-
-export class SensorReading extends ButtplugDeviceMessage {
-	static Name = "SensorReading";
-
-	constructor(
-		public DeviceIndex: number,
-		public SensorIndex: number,
-		public SensorType: SensorType,
-		public Data: number[],
-		public Id: number = DEFAULT_MESSAGE_ID,
-	) {
-		super(DeviceIndex, Id);
-	}
-}
-
-export class RawReadCmd extends ButtplugDeviceMessage {
-	static Name = "RawReadCmd";
-
-	constructor(
-		public DeviceIndex: number,
-		public Endpoint: string,
-		public ExpectedLength: number,
-		public Timeout: number,
-		public Id: number = DEFAULT_MESSAGE_ID,
-	) {
-		super(DeviceIndex, Id);
-	}
-}
-
-export class RawWriteCmd extends ButtplugDeviceMessage {
-	static Name = "RawWriteCmd";
-
-	constructor(
-		public DeviceIndex: number,
-		public Endpoint: string,
-		public Data: Uint8Array,
-		public WriteWithResponse: boolean,
-		public Id: number = DEFAULT_MESSAGE_ID,
-	) {
-		super(DeviceIndex, Id);
-	}
-}
-
-export class RawSubscribeCmd extends ButtplugDeviceMessage {
-	static Name = "RawSubscribeCmd";
-
-	constructor(
-		public DeviceIndex: number,
-		public Endpoint: string,
-		public Id: number = DEFAULT_MESSAGE_ID,
-	) {
-		super(DeviceIndex, Id);
-	}
-}
-
-export class RawUnsubscribeCmd extends ButtplugDeviceMessage {
-	static Name = "RawUnsubscribeCmd";
-
-	constructor(
-		public DeviceIndex: number,
-		public Endpoint: string,
-		public Id: number = DEFAULT_MESSAGE_ID,
-	) {
-		super(DeviceIndex, Id);
-	}
-}
-
-export class RawReading extends ButtplugDeviceMessage {
-	static Name = "RawReading";
-
-	constructor(
-		public DeviceIndex: number,
-		public Endpoint: string,
-		public Data: number[],
-		public Id: number = DEFAULT_MESSAGE_ID,
-	) {
-		super(DeviceIndex, Id);
-	}
+export interface StopCmd {
+  Id: number | undefined;
+  DeviceIndex: number | undefined;
+  FeatureIndex: number | undefined;
+  Inputs: boolean | undefined;
+  Outputs: boolean | undefined;
 }
--- a/packages/buttplug/src/index.ts
+++ b/packages/buttplug/src/index.ts
@@ -1,19 +1,27 @@
-import { ButtplugMessage } from "./core/Messages";
-import { IButtplugClientConnector } from "./client/IButtplugClientConnector";
-import { fromJSON } from "./core/MessageUtils";
-import { EventEmitter } from "eventemitter3";
+/*!
+ * Buttplug JS Source Code File - Visit https://buttplug.io for more info about
+ * the project. Licensed under the BSD 3-Clause license. See LICENSE file in the
+ * project root for full license information.
+ *
+ * @copyright Copyright (c) Nonpolynomial Labs LLC. All rights reserved.
+ */

-export * from "./client/Client";
-export * from "./client/ButtplugClientDevice";
-export * from "./client/ButtplugBrowserWebsocketClientConnector";
-export * from "./client/ButtplugNodeWebsocketClientConnector";
-export * from "./client/ButtplugClientConnectorException";
-export * from "./utils/ButtplugMessageSorter";
-export * from "./client/IButtplugClientConnector";
-export * from "./core/Messages";
-export * from "./core/MessageUtils";
-export * from "./core/Logging";
-export * from "./core/Exceptions";
+import { ButtplugMessage } from './core/Messages';
+import { IButtplugClientConnector } from './client/IButtplugClientConnector';
+import { EventEmitter } from 'eventemitter3';
+
+export * from './client/ButtplugClient';
+export * from './client/ButtplugClientDevice';
+export * from './client/ButtplugBrowserWebsocketClientConnector';
+export * from './client/ButtplugNodeWebsocketClientConnector';
+export * from './client/ButtplugClientConnectorException';
+export * from './utils/ButtplugMessageSorter';
+export * from './client/ButtplugClientDeviceCommand';
+export * from './client/ButtplugClientDeviceFeature';
+export * from './client/IButtplugClientConnector';
+export * from './core/Messages';
+export * from './core/Logging';
+export * from './core/Exceptions';

 export class ButtplugWasmClientConnector
  extends EventEmitter
@@ -36,18 +44,18 @@ export class ButtplugWasmClientConnector
  private static maybeLoadWasm = async () => {
    if (ButtplugWasmClientConnector.wasmInstance == undefined) {
      ButtplugWasmClientConnector.wasmInstance = await import(
-				"../wasm/index.js"
+        '../wasm/index.js'
      );
    }
  };

-	public static activateLogging = async (logLevel: string = "debug") => {
+  public static activateLogging = async (logLevel: string = 'debug') => {
    await ButtplugWasmClientConnector.maybeLoadWasm();
    if (this._loggingActivated) {
-			console.log("Logging already activated, ignoring.");
+      console.log('Logging already activated, ignoring.');
      return;
    }
-		console.log("Turning on logging.");
+    console.log('Turning on logging.');
    ButtplugWasmClientConnector.wasmInstance.buttplug_activate_env_logger(
      logLevel,
    );
@@ -57,7 +65,6 @@ export class ButtplugWasmClientConnector

  public connect = async (): Promise<void> => {
    await ButtplugWasmClientConnector.maybeLoadWasm();
-		//ButtplugWasmClientConnector.wasmInstance.buttplug_activate_env_logger('debug');
    this.client =
      ButtplugWasmClientConnector.wasmInstance.buttplug_create_embedded_wasm_server(
        (msgs) => {
@@ -73,7 +80,7 @@ export class ButtplugWasmClientConnector
  public send = (msg: ButtplugMessage): void => {
    ButtplugWasmClientConnector.wasmInstance.buttplug_client_send_json_message(
      this.client,
-			new TextEncoder().encode("[" + msg.toJSON() + "]"),
+      new TextEncoder().encode('[' + JSON.stringify(msg) + ']'),
      (output) => {
        this.emitMessage(output);
      },
@@ -82,7 +89,7 @@ export class ButtplugWasmClientConnector

  private emitMessage = (msg: Uint8Array) => {
    const str = new TextDecoder().decode(msg);
-		// This needs to use buttplug-js's fromJSON, otherwise we won't resolve the message name correctly.
-		this.emit("message", fromJSON(str));
+    const msgs: ButtplugMessage[] = JSON.parse(str);
+    this.emit('message', msgs);
  };
 }
--- a/packages/buttplug/src/lib.rs
+++ b/packages/buttplug/src/lib.rs
@@ -8,12 +8,16 @@ mod webbluetooth;
 use js_sys;
 use tokio_stream::StreamExt;
 use crate::webbluetooth::{WebBluetoothCommunicationManagerBuilder};
-use buttplug::{
-  core::message::{ButtplugServerMessageCurrent,serializer::vec_to_protocol_json},
-  server::{ButtplugServerBuilder,ButtplugServerDowngradeWrapper,device::{ServerDeviceManagerBuilder,configuration::{DeviceConfigurationManager}}},
-  util::async_manager, core::message::{BUTTPLUG_CURRENT_MESSAGE_SPEC_VERSION, ButtplugServerMessageVariant, serializer::{ButtplugSerializedMessage, ButtplugMessageSerializer, ButtplugServerJSONSerializer}},
-  util::device_configuration::load_protocol_configs
+use buttplug_core::{
+  message::{ButtplugServerMessageCurrent, BUTTPLUG_CURRENT_API_MAJOR_VERSION, serializer::{ButtplugSerializedMessage, ButtplugMessageSerializer}},
+  util::async_manager,
 };
+use buttplug_server::{
+  ButtplugServerBuilder, ButtplugServer,
+  device::ServerDeviceManagerBuilder,
+  message::{ButtplugServerMessageVariant, serializer::ButtplugServerJSONSerializer},
+};
+use buttplug_server_device_config::{DeviceConfigurationManager, load_protocol_configs};

 type FFICallback = js_sys::Function;
 type FFICallbackContext = u32;
@@ -33,16 +37,17 @@ use wasm_bindgen::prelude::*;
 use std::sync::Arc;
 use js_sys::Uint8Array;

-pub type ButtplugWASMServer = Arc<ButtplugServerDowngradeWrapper>;
+pub type ButtplugWASMServer = Arc<ButtplugServer>;

 pub fn send_server_message(
  message: &ButtplugServerMessageCurrent,
  callback: &FFICallback,
 ) {
-  let msg_array = [message.clone()];
-  let json_msg = vec_to_protocol_json(&msg_array);
-  let buf = json_msg.as_bytes();
-  {
+  let serializer = ButtplugServerJSONSerializer::default();
+  serializer.force_message_version(&BUTTPLUG_CURRENT_API_MAJOR_VERSION);
+  let json_msg = serializer.serialize(&[ButtplugServerMessageVariant::V4(message.clone())]);
+  if let ButtplugSerializedMessage::Text(json) = json_msg {
+    let buf = json.as_bytes();
    let this = JsValue::null();
    let uint8buf = unsafe { Uint8Array::new(&Uint8Array::view(buf)) };
    callback.call1(&this, &JsValue::from(uint8buf));
@@ -50,10 +55,9 @@ pub fn send_server_message(
 }

 #[no_mangle]
-pub fn create_test_dcm(allow_raw_messages: bool) -> DeviceConfigurationManager {
+pub fn create_test_dcm(_allow_raw_messages: bool) -> DeviceConfigurationManager {
  load_protocol_configs(&None, &None, false)
    .expect("If this fails, the whole library goes with it.")
-    .allow_raw_messages(allow_raw_messages)
    .finish()
    .expect("If this fails, the whole library goes with it.")
 }
@@ -68,18 +72,17 @@ pub fn buttplug_create_embedded_wasm_server(
  let mut sdm = ServerDeviceManagerBuilder::new(dcm);
  sdm.comm_manager(WebBluetoothCommunicationManagerBuilder::default());
  let builder = ButtplugServerBuilder::new(sdm.finish().unwrap());
-  let server = builder.finish().unwrap();
-  let wrapper = Arc::new(ButtplugServerDowngradeWrapper::new(server));
-  let event_stream = wrapper.server_version_event_stream();
+  let server = Arc::new(builder.finish().unwrap());
+  let event_stream = server.server_version_event_stream();
  let callback = callback.clone();
  async_manager::spawn(async move {
    pin_mut!(event_stream);
    while let Some(message) = event_stream.next().await {
-      send_server_message(&ButtplugServerMessageCurrent::try_from(message).unwrap(), &callback);
+      send_server_message(&message, &callback);
    }
  });

-  Box::into_raw(Box::new(wrapper))
+  Box::into_raw(Box::new(server))
 }

 #[no_mangle]
@@ -106,15 +109,18 @@ pub fn buttplug_client_send_json_message(
  };
  let callback = callback.clone();
  let serializer = ButtplugServerJSONSerializer::default();
-  serializer.force_message_version(&BUTTPLUG_CURRENT_MESSAGE_SPEC_VERSION);
+  serializer.force_message_version(&BUTTPLUG_CURRENT_API_MAJOR_VERSION);
  let input_msg = serializer.deserialize(&ButtplugSerializedMessage::Text(std::str::from_utf8(buf).unwrap().to_owned())).unwrap();
  async_manager::spawn(async move {
    let msg = input_msg[0].clone();
    let response = server.parse_message(msg).await.unwrap();
-    if let ButtplugServerMessageVariant::V3(response) = response {
-      send_server_message(&response, &callback);
+    let json_msg = serializer.serialize(&[response]);
+    if let ButtplugSerializedMessage::Text(json) = json_msg {
+      let buf = json.as_bytes();
+      let this = JsValue::null();
+      let uint8buf = unsafe { Uint8Array::new(&Uint8Array::view(buf)) };
+      callback.call1(&this, &JsValue::from(uint8buf));
    }
-
  });
 }

--- a/packages/buttplug/src/utils/ButtplugBrowserWebsocketConnector.ts
+++ b/packages/buttplug/src/utils/ButtplugBrowserWebsocketConnector.ts
@@ -6,11 +6,10 @@
 * @copyright Copyright (c) Nonpolynomial Labs LLC. All rights reserved.
 */

-"use strict";
+'use strict';

-import { EventEmitter } from "eventemitter3";
-import { ButtplugMessage } from "../core/Messages";
-import { fromJSON } from "../core/MessageUtils";
+import { EventEmitter } from 'eventemitter3';
+import { ButtplugMessage } from '../core/Messages';

 export class ButtplugBrowserWebsocketConnector extends EventEmitter {
  protected _ws: WebSocket | undefined;
@@ -27,20 +26,18 @@ export class ButtplugBrowserWebsocketConnector extends EventEmitter {
  public connect = async (): Promise<void> => {
    return new Promise<void>((resolve, reject) => {
      const ws = new (this._websocketConstructor ?? WebSocket)(this._url);
-			const onErrorCallback = (event: Event) => {
-				reject(event);
-			};
-			const onCloseCallback = (event: CloseEvent) => reject(event.reason);
-			ws.addEventListener("open", async () => {
+      const onErrorCallback = (event: Event) => {reject(event)}
+      const onCloseCallback = (event: CloseEvent) => reject(event.reason)
+      ws.addEventListener('open', async () => {
        this._ws = ws;
        try {
          await this.initialize();
-					this._ws.addEventListener("message", (msg) => {
+          this._ws.addEventListener('message', (msg) => {
            this.parseIncomingMessage(msg);
          });
-					this._ws.removeEventListener("close", onCloseCallback);
-					this._ws.removeEventListener("error", onErrorCallback);
-					this._ws.addEventListener("close", this.disconnect);
+          this._ws.removeEventListener('close', onCloseCallback);
+          this._ws.removeEventListener('error', onErrorCallback);
+          this._ws.addEventListener('close', this.disconnect);
          resolve();
        } catch (e) {
          reject(e);
@@ -50,8 +47,8 @@ export class ButtplugBrowserWebsocketConnector extends EventEmitter {
      // browsers usually only throw Error Code 1006. It's up to those using this
      // library to state what the problem might be.

-			ws.addEventListener("error", onErrorCallback);
-			ws.addEventListener("close", onCloseCallback);
+      ws.addEventListener('error', onErrorCallback)
+      ws.addEventListener('close', onCloseCallback);
    });
  };

@@ -61,14 +58,14 @@ export class ButtplugBrowserWebsocketConnector extends EventEmitter {
    }
    this._ws!.close();
    this._ws = undefined;
-		this.emit("disconnect");
+    this.emit('disconnect');
  };

  public sendMessage(msg: ButtplugMessage) {
    if (!this.Connected) {
-			throw new Error("ButtplugBrowserWebsocketConnector not connected");
+      throw new Error('ButtplugBrowserWebsocketConnector not connected');
    }
-		this._ws!.send("[" + msg.toJSON() + "]");
+    this._ws!.send('[' + JSON.stringify(msg) + ']');
  }

  public initialize = async (): Promise<void> => {
@@ -76,16 +73,16 @@ export class ButtplugBrowserWebsocketConnector extends EventEmitter {
  };

  protected parseIncomingMessage(event: MessageEvent) {
-		if (typeof event.data === "string") {
-			const msgs = fromJSON(event.data);
-			this.emit("message", msgs);
+    if (typeof event.data === 'string') {
+      const msgs: ButtplugMessage[] = JSON.parse(event.data);
+      this.emit('message', msgs);
    } else if (event.data instanceof Blob) {
      // No-op, we only use text message types.
    }
  }

  protected onReaderLoad(event: Event) {
-		const msgs = fromJSON((event.target as FileReader).result);
-		this.emit("message", msgs);
+    const msgs: ButtplugMessage[] = JSON.parse((event.target as FileReader).result as string);
+    this.emit('message', msgs);
  }
 }
--- a/packages/buttplug/src/utils/ButtplugMessageSorter.ts
+++ b/packages/buttplug/src/utils/ButtplugMessageSorter.ts
@@ -6,8 +6,8 @@
 * @copyright Copyright (c) Nonpolynomial Labs LLC. All rights reserved.
 */

-import * as Messages from "../core/Messages";
-import { ButtplugError } from "../core/Exceptions";
+import * as Messages from '../core/Messages';
+import { ButtplugError } from '../core/Exceptions';

 export class ButtplugMessageSorter {
  protected _counter = 1;
@@ -22,10 +22,10 @@ export class ButtplugMessageSorter {
  // them while waiting for them to return across the line.
  // tslint:disable:promise-function-async
  public PrepareOutgoingMessage(
-		msg: Messages.ButtplugMessage,
+    msg: Messages.ButtplugMessage
  ): Promise<Messages.ButtplugMessage> {
    if (this._useCounter) {
-			msg.Id = this._counter;
+      Messages.setMsgId(msg, this._counter);
      // Always increment last, otherwise we might lose sync
      this._counter += 1;
    }
@@ -35,23 +35,24 @@ export class ButtplugMessageSorter {
      (resolve, reject) => {
        res = resolve;
        rej = reject;
-			},
+      }
    );
-		this._waitingMsgs.set(msg.Id, [res, rej]);
+    this._waitingMsgs.set(Messages.msgId(msg), [res, rej]);
    return msgPromise;
  }

  public ParseIncomingMessages(
-		msgs: Messages.ButtplugMessage[],
+    msgs: Messages.ButtplugMessage[]
  ): Messages.ButtplugMessage[] {
    const noMatch: Messages.ButtplugMessage[] = [];
    for (const x of msgs) {
-			if (x.Id !== Messages.SYSTEM_MESSAGE_ID && this._waitingMsgs.has(x.Id)) {
-				const [res, rej] = this._waitingMsgs.get(x.Id)!;
+      let id = Messages.msgId(x);
+      if (id !== Messages.SYSTEM_MESSAGE_ID && this._waitingMsgs.has(id)) {
+        const [res, rej] = this._waitingMsgs.get(id)!;
        // If we've gotten back an error, reject the related promise using a
        // ButtplugException derived type.
-				if (x.Type === Messages.Error) {
-					rej(ButtplugError.FromError(x as Messages.Error));
+        if (x.Error !== undefined) {
+          rej(ButtplugError.FromError(x.Error!));
          continue;
        }
        res(x);
--- a/packages/buttplug/src/webbluetooth/webbluetooth_hardware.rs
+++ b/packages/buttplug/src/webbluetooth/webbluetooth_hardware.rs
@@ -1,12 +1,7 @@
 use async_trait::async_trait;
-use buttplug::{
-  core::{
-    errors::ButtplugDeviceError,
-    message::Endpoint,
-  },
-  server::device::{
-  configuration::{BluetoothLESpecifier, ProtocolCommunicationSpecifier},
-  hardware::{
+use buttplug_core::errors::ButtplugDeviceError;
+use buttplug_server_device_config::{BluetoothLESpecifier, Endpoint, ProtocolCommunicationSpecifier};
+use buttplug_server::device::hardware::{
    Hardware,
    HardwareConnector,
    HardwareEvent,
@@ -17,9 +12,6 @@ use buttplug::{
    HardwareSubscribeCmd,
    HardwareUnsubscribeCmd,
    HardwareWriteCmd,
-  },
-},
-  util::future::{ButtplugFuture, ButtplugFutureStateShared},
 };
 use futures::future::{self, BoxFuture};
 use js_sys::{DataView, Uint8Array};
@@ -28,7 +20,7 @@ use std::{
  convert::TryFrom,
  fmt::{self, Debug},
 };
-use tokio::sync::{broadcast, mpsc};
+use tokio::sync::{broadcast, mpsc, oneshot};
 use wasm_bindgen::prelude::*;
 use wasm_bindgen::JsCast;
 use wasm_bindgen_futures::{spawn_local, JsFuture};
@@ -41,9 +33,6 @@ use web_sys::{
  MessageEvent,
 };

-type WebBluetoothResultFuture = ButtplugFuture<Result<(), ButtplugDeviceError>>;
-type WebBluetoothReadResultFuture = ButtplugFuture<Result<HardwareReading, ButtplugDeviceError>>;
-
 struct BluetoothDeviceWrapper {
  pub device: BluetoothDevice
 }
@@ -179,7 +168,7 @@ impl HardwareSpecializer for WebBluetoothHardwareSpecializer {
          receiver,
          command_sender,
        ));
-        Ok(Hardware::new(&name, &address, &[], device_impl))
+        Ok(Hardware::new(&name, &address, &[], &None, false, device_impl))
      }
      WebBluetoothEvent::Disconnected => Err(
        ButtplugDeviceError::DeviceCommunicationError(
@@ -202,19 +191,19 @@ pub enum WebBluetoothEvent {
 pub enum WebBluetoothDeviceCommand {
  Write(
    HardwareWriteCmd,
-    ButtplugFutureStateShared<Result<(), ButtplugDeviceError>>,
+    oneshot::Sender<Result<(), ButtplugDeviceError>>,
  ),
  Read(
    HardwareReadCmd,
-    ButtplugFutureStateShared<Result<HardwareReading, ButtplugDeviceError>>,
+    oneshot::Sender<Result<HardwareReading, ButtplugDeviceError>>,
  ),
  Subscribe(
    HardwareSubscribeCmd,
-    ButtplugFutureStateShared<Result<(), ButtplugDeviceError>>,
+    oneshot::Sender<Result<(), ButtplugDeviceError>>,
  ),
  Unsubscribe(
    HardwareUnsubscribeCmd,
-    ButtplugFutureStateShared<Result<(), ButtplugDeviceError>>,
+    oneshot::Sender<Result<(), ButtplugDeviceError>>,
  ),
 }

@@ -287,7 +276,7 @@ async fn run_webbluetooth_loop(
    .await;
  while let Some(msg) = device_command_receiver.recv().await {
    match msg {
-      WebBluetoothDeviceCommand::Write(write_cmd, waker) => {
+      WebBluetoothDeviceCommand::Write(write_cmd, sender) => {
        debug!("Writing to endpoint {:?}", write_cmd.endpoint());
        let chr = char_map.get(&write_cmd.endpoint()).unwrap().clone();
        spawn_local(async move {
@@ -295,10 +284,10 @@ async fn run_webbluetooth_loop(
          JsFuture::from(chr.write_value_with_u8_array(&uint8buf).unwrap())
            .await
            .unwrap();
-          waker.set_reply(Ok(()));
+          let _ = sender.send(Ok(()));
        });
      }
-      WebBluetoothDeviceCommand::Read(read_cmd, waker) => {
+      WebBluetoothDeviceCommand::Read(read_cmd, sender) => {
        debug!("Writing to endpoint {:?}", read_cmd.endpoint());
        let chr = char_map.get(&read_cmd.endpoint()).unwrap().clone();
        spawn_local(async move {
@@ -307,10 +296,10 @@ async fn run_webbluetooth_loop(
          let mut body = vec![0; data_view.byte_length() as usize];
          Uint8Array::new(&data_view).copy_to(&mut body[..]);
          let reading = HardwareReading::new(read_cmd.endpoint(), &body);
-          waker.set_reply(Ok(reading));
+          let _ = sender.send(Ok(reading));
        });
      }
-      WebBluetoothDeviceCommand::Subscribe(subscribe_cmd, waker) => {
+      WebBluetoothDeviceCommand::Subscribe(subscribe_cmd, sender) => {
        debug!("Subscribing to endpoint {:?}", subscribe_cmd.endpoint());
        let chr = char_map.get(&subscribe_cmd.endpoint()).unwrap().clone();
        let ep = subscribe_cmd.endpoint();
@@ -335,10 +324,10 @@ async fn run_webbluetooth_loop(
        spawn_local(async move {
          JsFuture::from(chr.start_notifications()).await.unwrap();
          debug!("Endpoint subscribed");
-          waker.set_reply(Ok(()));
+          let _ = sender.send(Ok(()));
        });
      }
-      WebBluetoothDeviceCommand::Unsubscribe(_unsubscribe_cmd, _waker) => {}
+      WebBluetoothDeviceCommand::Unsubscribe(_unsubscribe_cmd, _sender) => {}
    }
  }
  debug!("run_webbluetooth_loop exited!");
@@ -388,12 +377,13 @@ impl HardwareInternal for WebBluetoothHardware {
    let sender = self.device_command_sender.clone();
    let msg = msg.clone();
    Box::pin(async move {
-      let fut = WebBluetoothReadResultFuture::default();
-      let waker = fut.get_state_clone();
-      sender
-        .send(WebBluetoothDeviceCommand::Read(msg, waker))
+      let (tx, rx) = oneshot::channel();
+      let _ = sender
+        .send(WebBluetoothDeviceCommand::Read(msg, tx))
        .await;
-      fut.await
+      rx.await.unwrap_or(Err(ButtplugDeviceError::DeviceCommunicationError(
+        "Device command channel closed".to_string(),
+      )))
    })
  }

@@ -401,12 +391,13 @@ impl HardwareInternal for WebBluetoothHardware {
    let sender = self.device_command_sender.clone();
    let msg = msg.clone();
    Box::pin(async move {
-      let fut = WebBluetoothResultFuture::default();
-      let waker = fut.get_state_clone();
-      sender
-        .send(WebBluetoothDeviceCommand::Write(msg.clone(), waker))
+      let (tx, rx) = oneshot::channel();
+      let _ = sender
+        .send(WebBluetoothDeviceCommand::Write(msg, tx))
        .await;
-      fut.await
+      rx.await.unwrap_or(Err(ButtplugDeviceError::DeviceCommunicationError(
+        "Device command channel closed".to_string(),
+      )))
    })
  }

@@ -414,12 +405,13 @@ impl HardwareInternal for WebBluetoothHardware {
    let sender = self.device_command_sender.clone();
    let msg = msg.clone();
    Box::pin(async move {
-      let fut = WebBluetoothResultFuture::default();
-      let waker = fut.get_state_clone();
-      sender
-        .send(WebBluetoothDeviceCommand::Subscribe(msg.clone(), waker))
+      let (tx, rx) = oneshot::channel();
+      let _ = sender
+        .send(WebBluetoothDeviceCommand::Subscribe(msg, tx))
        .await;
-      fut.await
+      rx.await.unwrap_or(Err(ButtplugDeviceError::DeviceCommunicationError(
+        "Device command channel closed".to_string(),
+      )))
    })
  }

--- a/packages/buttplug/src/webbluetooth/webbluetooth_manager.rs
+++ b/packages/buttplug/src/webbluetooth/webbluetooth_manager.rs
@@ -1,14 +1,10 @@
 use super::webbluetooth_hardware::WebBluetoothHardwareConnector;

-use buttplug::{
-  core::ButtplugResultFuture,
-  server::device::{
-    configuration::{ProtocolCommunicationSpecifier},
-    hardware::communication::{
+use buttplug_core::ButtplugResultFuture;
+use buttplug_server_device_config::ProtocolCommunicationSpecifier;
+use buttplug_server::device::hardware::communication::{
  HardwareCommunicationManager, HardwareCommunicationManagerBuilder,
  HardwareCommunicationManagerEvent,
-    },
-  }
 };
 use futures::future;
 use js_sys::Array;
@@ -69,8 +65,8 @@ impl HardwareCommunicationManager for WebBluetoothCommunicationManager {
      let options = web_sys::RequestDeviceOptions::new();
      let filters = Array::new();
      let optional_services = Array::new();
-      for vals in config_manager.protocol_device_configurations().iter() {
-        for config in vals.1 {
+      for vals in config_manager.base_communication_specifiers().iter() {
+        for config in vals.1.iter() {
          if let ProtocolCommunicationSpecifier::BluetoothLE(btle) = &config {
            for name in btle.names() {
              let filter = web_sys::BluetoothLeScanFilterInit::new();
--- a/packages/buttplug/tsconfig.json
+++ b/packages/buttplug/tsconfig.json
@@ -5,9 +5,7 @@
 		"outDir": "dist",
 		"moduleResolution": "bundler",
 		"esModuleInterop": true,
-		"skipLibCheck": true,
-		"emitDecoratorMetadata": true,
-		"experimentalDecorators": true
+		"skipLibCheck": true
 	},
 	"include": ["src"]
 }
--- a/packages/buttplug/vite.config.ts
+++ b/packages/buttplug/vite.config.ts
@@ -14,5 +14,8 @@ export default defineConfig({
 		minify: false, // for demo purposes
 		target: "esnext", // this is important as well
 		outDir: "dist",
+		rollupOptions: {
+			external: [/\.\/wasm\//, /\.\.\/wasm\//],
+		},
 	},
 });
--- a/packages/frontend/src/lib/components/device-card/device-card.svelte
+++ b/packages/frontend/src/lib/components/device-card/device-card.svelte
@@ -5,7 +5,6 @@ import { Label } from "$lib/components/ui/label";
 import { Card, CardContent, CardHeader } from "$lib/components/ui/card";
 import type { BluetoothDevice } from "$lib/types";
 import { _ } from "svelte-i18n";
-import { ActuatorType } from "@sexy.pivoine.art/buttplug";

 interface Props {
 	device: BluetoothDevice;
@@ -16,7 +15,7 @@ interface Props {
 let { device, onChange, onStop }: Props = $props();

 function getBatteryColor(level: number) {
-	if (!device.info.hasBattery) {
+	if (!device.hasBattery) {
 		return "text-gray-400";
 	}
 	if (level > 60) return "text-green-400";
@@ -25,7 +24,7 @@ function getBatteryColor(level: number) {
 }

 function getBatteryBgColor(level: number) {
-	if (!device.info.hasBattery) {
+	if (!device.hasBattery) {
 		return "bg-gray-400/20";
 	}
 	if (level > 60) return "bg-green-400/20";
@@ -34,17 +33,13 @@ function getBatteryBgColor(level: number) {
 }

 function getScalarAnimations() {
-	const cmds: [{ ActuatorType: typeof ActuatorType }] =
-		device.info.messageAttributes.ScalarCmd;
-	return cmds
-		.filter((_, i: number) => !!device.actuatorValues[i])
-		.map(({ ActuatorType }) => `animate-${ActuatorType.toLowerCase()}`);
+	return device.actuators
+		.filter((a) => a.value > 0)
+		.map((a) => `animate-${a.outputType.toLowerCase()}`);
 }

 function isActive() {
-	const cmds: [{ ActuatorType: typeof ActuatorType }] =
-		device.info.messageAttributes.ScalarCmd;
-	return cmds.some((_, i: number) => !!device.actuatorValues[i]);
+	return device.actuators.some((a) => a.value > 0);
 }
 </script>

@@ -119,7 +114,7 @@ function isActive() {
                    ></span>
                    <span class="text-sm text-muted-foreground">{$_("device_card.battery")}</span>
                </div>
-                {#if device.info.hasBattery}
+                {#if device.hasBattery}
                <span class="text-sm font-medium {getBatteryColor(device.batteryLevel)}">
                    {device.batteryLevel}%
                </span>
@@ -144,19 +139,19 @@ function isActive() {
    </div> -->

        <!-- Action Button -->
-        {#each device.info.messageAttributes.ScalarCmd as scalarCmd}
+        {#each device.actuators as actuator, idx}
            <div class="space-y-2">
-                <Label for={`device-${device.info.index}-${scalarCmd.Index}`}
+                <Label for={`device-${device.info.index}-${actuator.featureIndex}-${actuator.outputType}`}
                    >{$_(
-                        `device_card.actuator_types.${scalarCmd.ActuatorType.toLowerCase()}`,
+                        `device_card.actuator_types.${actuator.outputType.toLowerCase()}`,
                    )}</Label
                >
                <Slider
-                    id={`device-${device.info.index}-${scalarCmd.Index}`}
+                    id={`device-${device.info.index}-${actuator.featureIndex}-${actuator.outputType}`}
                    type="single"
-                    value={device.actuatorValues[scalarCmd.Index]}
-                    onValueChange={(val) => onChange(scalarCmd.Index, val)}
-                    max={scalarCmd.StepCount}
+                    value={actuator.value}
+                    onValueChange={(val) => onChange(idx, val)}
+                    max={actuator.maxSteps}
                    step={1}
                />
            </div>
--- a/packages/frontend/src/lib/types.ts
+++ b/packages/frontend/src/lib/types.ts
@@ -108,12 +108,20 @@ export interface Stats {
 	viewers_count: number;
 }

+export interface DeviceActuator {
+	featureIndex: number;
+	outputType: string;
+	maxSteps: number;
+	descriptor: string;
+	value: number;
+}
+
 export interface BluetoothDevice {
 	id: string;
 	name: string;
-	actuatorValues: number[];
-	sensorValues: number[];
+	actuators: DeviceActuator[];
 	batteryLevel: number;
+	hasBattery: boolean;
 	isConnected: boolean;
 	lastSeen: Date;
 	info: ButtplugClientDevice;
--- a/packages/frontend/src/routes/play/+page.svelte
+++ b/packages/frontend/src/routes/play/+page.svelte
@@ -3,18 +3,13 @@ import { _ } from "svelte-i18n";
 import Meta from "$lib/components/meta/meta.svelte";
 import {
 	ButtplugClient,
-	ButtplugMessage,
 	ButtplugWasmClientConnector,
-	DeviceList,
-	SensorReadCmd,
-	StopDeviceCmd,
-	SensorReading,
-	ScalarCmd,
-	ScalarSubcommand,
-	ButtplugDeviceMessage,
 	ButtplugClientDevice,
-	SensorType,
+	OutputType,
+	InputType,
+	DeviceOutputValueConstructor,
 } from "@sexy.pivoine.art/buttplug";
+import type { ButtplugMessage } from "@sexy.pivoine.art/buttplug";
 import Button from "$lib/components/ui/button/button.svelte";
 import { onMount } from "svelte";
 import { goto } from "$app/navigation";
@@ -50,11 +45,12 @@ async function init() {
 	// await ButtplugWasmClientConnector.activateLogging("info");
 	await client.connect(connector);
 	client.on("deviceadded", onDeviceAdded);
-	client.on("deviceremoved", (msg: ButtplugDeviceMessage) =>
-		devices.splice(msg.DeviceIndex, 1),
-	);
+	client.on("deviceremoved", (dev: ButtplugClientDevice) => {
+		const idx = devices.findIndex((d) => d.info.index === dev.index);
+		if (idx !== -1) devices.splice(idx, 1);
+	});
 	client.on("scanningfinished", () => (scanning = false));
-	connector.on("message", handleMessages);
+	client.on("inputreading", handleInputReading);
 	connected = client.connected;
 }

@@ -63,65 +59,48 @@ async function startScanning() {
 	scanning = true;
 }

-async function onDeviceAdded(
-	msg: ButtplugDeviceMessage,
-	dev: ButtplugClientDevice,
-) {
+async function onDeviceAdded(dev: ButtplugClientDevice) {
 	const device = convertDevice(dev);
 	devices.push(device);

-	const cmds = device.info.messageAttributes.SensorReadCmd;
-
-	cmds?.forEach(async (cmd) => {
-		await client.sendDeviceMessage(
-			{ index: device.info.index },
-			new SensorReadCmd(device.info.index, cmd.Index, cmd.SensorType),
-		);
-	});
+	// Try to read battery level
+	if (device.hasBattery) {
+		try {
+			device.batteryLevel = await dev.battery();
+		} catch (e) {
+			console.warn(`Failed to read battery for ${dev.name}:`, e);
+		}
+	}
 }

-async function handleMessages(messages: ButtplugMessage[]) {
-	messages.forEach(async (msg) => {
-		await handleMessage(msg);
-	});
-}
+function handleInputReading(msg: ButtplugMessage) {
+	if (msg.InputReading === undefined) return;
+	const reading = msg.InputReading;
+	const device = devices.find((d) => d.info.index === reading.DeviceIndex);
+	if (!device) return;

-async function handleMessage(msg: ButtplugMessage) {
-	if (msg instanceof SensorReading) {
-		const device = devices[msg.DeviceIndex];
-		if (msg.SensorType === SensorType.Battery) {
-			device.batteryLevel = msg.Data[0];
+	if (reading.Reading[InputType.Battery] !== undefined) {
+		device.batteryLevel = reading.Reading[InputType.Battery].Value;
 	}
-		device.sensorValues[msg.Index] = msg.Data[0];
 	device.lastSeen = new Date();
-	} else if (msg instanceof DeviceList) {
-		devices = client.devices.map(convertDevice);
-	}
 }

 async function handleChange(
 	device: BluetoothDevice,
-	scalarIndex: number,
+	actuatorIdx: number,
 	value: number,
 ) {
-	const vibrateCmd = device.info.messageAttributes.ScalarCmd[scalarIndex];
-	await client.sendDeviceMessage(
-		{ index: device.info.index },
-		new ScalarCmd(
-			[
-				new ScalarSubcommand(
-					vibrateCmd.Index,
-					(device.actuatorValues[scalarIndex] = value),
-					vibrateCmd.ActuatorType,
-				),
-			],
-			device.info.index,
-		),
-	);
+	const actuator = device.actuators[actuatorIdx];
+	const feature = device.info.features.get(actuator.featureIndex);
+	if (!feature) return;
+
+	actuator.value = value;
+	const outputType = actuator.outputType as OutputType;
+	await feature.runOutput(new DeviceOutputValueConstructor(outputType).steps(value));

 	// Capture event if recording
 	if (isRecording && recordingStartTime) {
-		captureEvent(device, scalarIndex, value);
+		captureEvent(device, actuatorIdx, value);
 	}
 }

@@ -145,44 +124,51 @@ function stopRecording() {

 function captureEvent(
 	device: BluetoothDevice,
-	scalarIndex: number,
+	actuatorIdx: number,
 	value: number,
 ) {
 	if (!recordingStartTime) return;

 	const timestamp = performance.now() - recordingStartTime;
-	const scalarCmd = device.info.messageAttributes.ScalarCmd[scalarIndex];
+	const actuator = device.actuators[actuatorIdx];

 	recordedEvents.push({
 		timestamp,
 		deviceIndex: device.info.index,
 		deviceName: device.name,
-		actuatorIndex: scalarIndex,
-		actuatorType: scalarCmd.ActuatorType,
-		value: (value / scalarCmd.StepCount) * 100, // Normalize to 0-100
+		actuatorIndex: actuatorIdx,
+		actuatorType: actuator.outputType,
+		value: (value / actuator.maxSteps) * 100, // Normalize to 0-100
 	});
 }

 async function handleStop(device: BluetoothDevice) {
-	await client.sendDeviceMessage(
-		{ index: device.info.index },
-		new StopDeviceCmd(device.info.index),
-	);
-	device.actuatorValues = device.info.messageAttributes.ScalarCmd.map(() => 0);
+	await device.info.stop();
+	device.actuators.forEach((a) => (a.value = 0));
 }

 function convertDevice(device: ButtplugClientDevice): BluetoothDevice {
-	console.log(device);
+	const actuators: import("$lib/types").DeviceActuator[] = [];
+	for (const [, feature] of device.features) {
+		for (const outputType of feature.outputTypes) {
+			actuators.push({
+				featureIndex: feature.featureIndex,
+				outputType,
+				maxSteps: feature.outputMaxValue(outputType),
+				descriptor: feature.featureDescriptor,
+				value: 0,
+			});
+		}
+	}
+
 	return {
-		id: device.index as string,
-		name: device.name as string,
+		id: String(device.index),
+		name: device.name,
+		actuators,
 		batteryLevel: 0,
+		hasBattery: device.hasInput(InputType.Battery),
 		isConnected: true,
 		lastSeen: new Date(),
-		sensorValues: device.messageAttributes.SensorReadCmd
-			? device.messageAttributes.SensorReadCmd.map(() => 0)
-			: [],
-		actuatorValues: device.messageAttributes.ScalarCmd.map(() => 0),
 		info: device,
 	};
 }
@@ -195,7 +181,7 @@ async function handleSaveRecording(data: {
 	const deviceInfo: DeviceInfo[] = devices.map((d) => ({
 		name: d.name,
 		index: d.info.index,
-		capabilities: d.info.messageAttributes.ScalarCmd.map((cmd) => cmd.ActuatorType),
+		capabilities: d.actuators.map((a) => a.outputType),
 	}));

 	try {
@@ -345,37 +331,26 @@ function executeEvent(event: RecordedEvent) {
 	}

 	// Find matching actuator by type
-	const scalarCmd = device.info.messageAttributes.ScalarCmd.find(
-		cmd => cmd.ActuatorType === event.actuatorType
+	const actuator = device.actuators.find(
+		(a) => a.outputType === event.actuatorType,
 	);
-	if (!scalarCmd) {
+	if (!actuator) {
 		console.warn(`Actuator type ${event.actuatorType} not found on ${device.name}`);
 		return;
 	}

 	// Convert normalized value (0-100) back to device scale
-	const deviceValue = (event.value / 100) * scalarCmd.StepCount;
+	const deviceValue = Math.round((event.value / 100) * actuator.maxSteps);

-	// Send command to device
-	client.sendDeviceMessage(
-		{ index: device.info.index },
-		new ScalarCmd(
-			[
-				new ScalarSubcommand(
-					scalarCmd.Index,
-					deviceValue,
-					scalarCmd.ActuatorType,
-				),
-			],
-			device.info.index,
-		),
-	);
+	// Send command to device via feature
+	const feature = device.info.features.get(actuator.featureIndex);
+	if (feature) {
+		const outputType = actuator.outputType as OutputType;
+		feature.runOutput(new DeviceOutputValueConstructor(outputType).steps(deviceValue));
+	}

 	// Update UI
-	const scalarIndex = device.info.messageAttributes.ScalarCmd.indexOf(scalarCmd);
-	if (scalarIndex !== -1) {
-		device.actuatorValues[scalarIndex] = deviceValue;
-	}
+	actuator.value = deviceValue;
 }

 function seek(percentage: number) {
@@ -618,7 +593,7 @@ onMount(() => {
        deviceInfo={devices.map((d) => ({
            name: d.name,
            index: d.info.index,
-            capabilities: d.info.messageAttributes.ScalarCmd.map((cmd) => cmd.ActuatorType),
+            capabilities: d.actuators.map((a) => a.outputType),
        }))}
        duration={recordingDuration}
        onSave={handleSaveRecording}
--- a/packages/frontend/src/routes/play/components/device-mapping-dialog.svelte
+++ b/packages/frontend/src/routes/play/components/device-mapping-dialog.svelte
@@ -19,8 +19,8 @@ let mappings = $state<Map<string, BluetoothDevice>>(new Map());

 // Check if a connected device is compatible with a recorded device
 function isCompatible(recordedDevice: DeviceInfo, connectedDevice: BluetoothDevice): boolean {
-	const connectedActuators = connectedDevice.info.messageAttributes.ScalarCmd.map(
-		cmd => cmd.ActuatorType
+	const connectedActuators = connectedDevice.actuators.map(
+		(a) => a.outputType,
 	);

 	// Check if all required actuator types from recording exist on connected device
--- a/packages/frontend/vite.config.ts
+++ b/packages/frontend/vite.config.ts
@@ -8,6 +8,14 @@ export default defineConfig({
 	resolve: {
 		alias: { $lib: path.resolve("./src/lib"), "@": path.resolve("./src/lib") },
 	},
+	ssr: {
+		noExternal: ["@sexy.pivoine.art/buttplug"],
+	},
+	build: {
+		rollupOptions: {
+			external: [/\/wasm\/index\.js/],
+		},
+	},
 	server: {
 		port: 3000,
 		proxy: {
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -23,15 +23,9 @@ importers:

  packages/buttplug:
    dependencies:
-      class-transformer:
-        specifier: ^0.5.1
-        version: 0.5.1
      eventemitter3:
        specifier: ^5.0.1
        version: 5.0.1
-      reflect-metadata:
-        specifier: ^0.2.2
-        version: 0.2.2
      typescript:
        specifier: ^5.9.2
        version: 5.9.3
@@ -1650,9 +1644,6 @@ packages:
    resolution: {integrity: sha512-bIomtDF5KGpdogkLd9VspvFzk9KfpyyGlS8YFVZl7TGPBHL5snIOnxeshwVgPteQ9b4Eydl+pVbIyE1DcvCWgQ==}
    engines: {node: '>=10'}

-  class-transformer@0.5.1:
-    resolution: {integrity: sha512-SQa1Ws6hUbfC98vKGxZH3KFY0Y1lm5Zm0SY8XX9zbK7FJCyVEac3ATW0RIpwzW+oOfmHE5PMPufDG9hCfoEOMw==}
-
  cli-color@2.0.4:
    resolution: {integrity: sha512-zlnpg0jNcibNrO7GG9IeHH7maWFeCz+Ja1wx/7tZNU5ASSSSZ+/qZciM0/LHCYxSdqv5h2sdbQ/PXYdOuetXvA==}
    engines: {node: '>=0.10'}
@@ -2857,9 +2848,6 @@ packages:
    resolution: {integrity: sha512-EJ4UNY/U1t2P/2k6oqotuX2Cc3T6nxJwsM0N0asT7dhrtH1ltUxDn4NalSYmPE2rCkVpcf/X6R0wDwcFpzhd4w==}
    engines: {node: '>=6'}

-  reflect-metadata@0.2.2:
-    resolution: {integrity: sha512-urBwgfrvVP/eAyXx4hluJivBKzuEbSQs9rKWCrCkbSxNv8mxPcUZKeuoF3Uy4mJl3Lwprp6yy5/39VWigZ4K6Q==}
-
  relative-time-format@1.1.11:
    resolution: {integrity: sha512-TH+oV/w77hjaB9xCzoFYJ/Icmr/12+02IAoCI/YGS2UBTbjCbBjHGEBxGnVy4EJvOR1qadGzyFRI6hGaJJG93Q==}

@@ -4710,8 +4698,6 @@ snapshots:

  chownr@2.0.0: {}

-  class-transformer@0.5.1: {}
-
  cli-color@2.0.4:
    dependencies:
      d: 1.0.2
@@ -5897,8 +5883,6 @@ snapshots:

  reduce-flatten@2.0.0: {}

-  reflect-metadata@0.2.2: {}
-
  relative-time-format@1.1.11: {}

  resolve-from@4.0.0: {}