aqhome: completed adapting to msgio2 interface.

apps/aqhomed/init.c

@@ -185,6 +185,7 @@ void _setupMqtt(AQHOMED *aqh, GWEN_DB_NODE *dbArgs)
     int rv;
 
     ep=AQH_MqttClientEndpoint2_new(mqttClientId, mqttAddress, mqttPort, NULL, AQHOME_ENDPOINTGROUP_MQTT);
+    AqHomed_SetMqttTopicPrefix(aqh, mqttTopicPrefix);
     AQH_MqttClientEndpoint2_SetTopicPrefix(ep, mqttTopicPrefix);
     AQH_MqttClientEndpoint2_SetKeepAliveTime(ep, mqttKeepAlive);