move sparkplug decoding to backend

backend/src/index.ts

@@ -10,6 +10,7 @@ import {
   makePublishEvent,
   removeConnection,
 } from '../../events'
+import { SparkplugDecoder } from './Model/sparkplugb'
 
 export class ConnectionManager {
   private connections: { [s: string]: DataSource<any> } = {}
@@ -48,7 +49,7 @@ export class ConnectionManager {
 
       backendEvents.emit(messageEvent, {
         topic,
-        payload: Base64Message.fromBuffer(buffer),
+        payload: SparkplugDecoder.decode(buffer) ?? Base64Message.fromBuffer(buffer),
         qos: packet.qos,
         retain: packet.retain,
         messageId: packet.messageId,