feat: Refactor BedHardware to use a singleton instance and remove serial implementation

services/BedHardware.ts

@@ -1,19 +1,15 @@
 import { EventEmitter } from 'events';
 import { IBedHardware, PinState, PinChange, BedHardwareConfig } from '../types/bedhardware';
-import { BedHardwareSerial } from './BedHardwareSerial';
 import { BedHardwareMQTT } from './BedHardwareMQTT';
 
 /**
- * BedHardware - Factory class for creating bed hardware implementations
+ * BedHardware - MQTT-based bed hardware implementation
  * 
  * Usage:
- * // MQTT (connects to broker.hivemq.com with base topic /Jtkcp2N/pressurebed/)
+ * MQTT (connects to broker.hivemq.com with base topic /Jtkcp2N/pressurebed/)
  * const hardware = BedHardware.createSimpleMQTT();
  * 
- * // Serial
- * const hardware = BedHardware.createSerial('COM3', 9600);
- * 
- * // With custom topics
+ * With custom topics
  * const hardware = BedHardware.createMQTT({
  *   topics: {
  *     pinState: '/custom/pin/state',
@@ -24,18 +20,10 @@ import { BedHardwareMQTT } from './BedHardwareMQTT';
  */
 export class BedHardware extends EventEmitter implements IBedHardware {
   private implementation: IBedHardware;
-
   constructor(config: BedHardwareConfig) {
     super();
 
-    if (config.type === 'serial') {
-      if (!config.serial?.portPath) {
-        throw new Error('Serial port path is required for serial connection');
-      }
-      this.implementation = new BedHardwareSerial(
-        config.serial.portPath,
-        config.serial.baudRate || 9600      );
-    } else if (config.type === 'mqtt') {
+    if (config.type === 'mqtt') {
       this.implementation = new BedHardwareMQTT({
         topics: config.mqtt?.topics
       });
@@ -88,14 +76,8 @@ export class BedHardware extends EventEmitter implements IBedHardware {
   isConnected(): boolean {
     return this.implementation.isConnected();
   }
-
   // Static factory methods for convenience
-  static createSerial(portPath: string, baudRate: number = 9600): BedHardware {
-    return new BedHardware({
-      type: 'serial',
-      serial: { portPath, baudRate }
-    });
-  }  static createMQTT(config?: {
+  static createMQTT(config?: {
     topics?: {
       pinState: string;
       pinChange: string;
@@ -114,13 +96,12 @@ export class BedHardware extends EventEmitter implements IBedHardware {
       mqtt: {}
     });
   }
-
-  // Static method to list available serial ports (for serial implementation)
-  static async listSerialPorts(): Promise<string[]> {
-    return BedHardwareSerial.listPorts();
-  }
 }
 
-// Export all classes for direct access if needed
-export { BedHardwareSerial, BedHardwareMQTT };
+// Create and export a default MQTT instance
+export const bedHardwareInstance = new BedHardware({
+  type: 'mqtt',
+  mqtt: {}
+});
+
 export * from '../types/bedhardware';