Question

嗨，我正在使用Paho的Python Mqtt-Client来接收从物联网板（NodeMCU）发布的IR-Senor值。这是我的代码。

# Defining logging call-back for debugging.
def on_log(client,userdata,level,buf):
    print(str(level)+" "+str(buf))

# Defining call-back to be called upon connection of client with broker.
def on_connect(client,userdata,flags,rc):
    print("Connected to broker with result code "+str(rc));
    # Subscribing to required topic.
    client.subscribe(MQTT_CONST['bell_topic'])

# Defining call-back for when message is published to a subscribed topic.
def on_message(client,userdata,msg):
    print(str(msg.payload))

# Attaching callbacks to Client.
client = mqtt.Client(client_id='Python_Client')
client.on_log = on_log
client.on_connect = on_connect
client.on_message = on_message
client.username_pw_set(MQTT_CONST['mqtt_user_name'],MQTT_CONST['mqtt_password'])

# Connecting to Broker.
client.connect(MQTT_CONST['mqtt_broker_address'],MQTT_CONST['mqtt_port'],60)
client.loop_forever()

我有信心微控制器上的Arduino MQTT客户端可以正常工作，因为我使用了另一个应用程序，该应用程序订阅了传感器主题，并且可以很好地接收微控制器发送的有效负载。

由于某种原因，我似乎无法在使用python的linux机器上做到这一点。我究竟做错了什么？如果正在使用，我正在使用mqtt.beebotte.com:1883。

Paho Python Mqtt on_message没有被调用

0 个答案: