Fix authentication

backend/src/DataSource/DataSourceState.ts

@@ -3,7 +3,7 @@ import { EventDispatcher } from '../../../events'
 export interface DataSourceState {
   connecting: boolean
   connected: boolean
-  error?: Error
+  error?: string
 }
 
 export class DataSourceStateMachine {
@@ -25,7 +25,7 @@ export class DataSourceStateMachine {
 
   public setError(error: Error) {
     this.state = {
-      error,
+      error: error.message,
       connected: false,
       connecting: false,
     }

backend/src/DataSource/MqttSource.ts

@@ -1,6 +1,7 @@
+import * as Url from 'url'
+
 import { Client, connect as mqttConnect } from 'mqtt'
 import { DataSource, DataSourceStateMachine } from './'
-import * as Url from 'url'
 
 export interface MqttOptions {
   url: string
@@ -36,6 +37,8 @@ export class MqttSource implements DataSource<MqttOptions> {
     const client = mqttConnect(url, {
       resubscribe: false,
       rejectUnauthorized: !options.certValidation,
+      username: options.username,
+      password: options.password,
     })
 
     this.client = client