针对你提出的“python mqtt valueerror: unsupported callback api version: version 2.0 added”问题,我可以从以下几个方面来帮助你解决: 查找MQTT库文档中关于回调API版本的信息: 首先,你需要确定你正在使用的MQTT库(如paho-mqtt、hivemq等)。不同的库可能有不同的回调API版本支持情况。 查阅该库的官方文档,了解...
# For paho-mqtt 2.0.0, you need to set callback_api_version. # client = mqtt_client.Client(client_id=client_id, callback_api_version=mqtt_client.CallbackAPIVersion.VERSION2) # client.username_pw_set(username, password) client.on_connect = on_connect client.connect(broker, port) return ...
首先要创建MQTT客户端实例: client = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2, auth_Info.mqttClientId, protocol=mqtt.MQTTv311, clean_session=True,transport="websockets") 这里要注意,如果使用websockets的连接方式,一定要设置参数transport="websockets";另外使用paho库,需要指定客户端回调函数的版本。
'''print(msg.topic+' '+str(msg.payload))# 输出值形如 $SYS/broker/version b'mosquitto version 2.0.18'mqttc=mqtt.Client(mqtt.CallbackAPIVersion.VERSION2)mqttc.on_connect=on_connect mqttc.on_disconnect=on_disconnect mqttc.on_message=on_message # client.username_pw_set('testacc','test123...
FLAG_EXIT=Truedefon_message(client, userdata, msg):print(f'Received `{msg.payload.decode()}` from `{msg.topic}` topic')defconnect_mqtt(): client= mqtt.Client(client_id=CLIENT_ID, transport='websockets',callback_api_version=mqtt.CallbackAPIVersion.VERSION1)#client = mqtt_client.Client(CL...
client = connect_mqtt() #client = mqtt_client.Client(mqtt_client.CallbackAPIVersion.VERSION1, client_id) client.loop_start() subscribe(client,ShareImages,lock) # 回调模式 publish(client,ShareImages,lock) ''' if __name__ == '__main__': lock = Manager().Lock()#创建共享内存容器 Share...
("Failed to connect, return code %d\n", rc)# Set Connecting Client IDclient = mqtt_client.Client(client_id)# For paho-mqtt 2.0.0, you need to set callback_api_version.# client = mqtt_client.Client(client_id=client_id, callback_api_version=mqtt_client.CallbackAPIVersion.VERSION2)# ...
client = mqtt.Client(callback_api_version=mqtt.CallbackAPIVersion.VERSION1,client_id=CLIENT_ID) #client = mqtt.Client(client_id=CLIENT_ID, clean_session=True) #client.protocol_version = mqtt.MQTTv5 # 设置用户名和密码 client.username_pw_set(USERNAME, PASSWORD) ...
MQTT的paho.mqtt.python如何设置会话过去间隔,代码如下: mqttc = mqtt.Client(mqtt.CallbackAPIVersion.VERSION2, client_id=hostname, clean_session=False) mqttc.username_pw_set(mqtt_username, mqtt_password) mqttc.on_connect = on_connect mqttc.on_message = on_message mqttc.on_subscribe = on_...
defconnect_mqtt(): defon_connect(client,userdata,flags,rc,properties): ifrc==0: print("Connected to MQTT Broker!") else: print("Failed to connect, return code %d\n",rc) logging.basicConfig(level=logging.DEBUG) client=mqtt_client.Client(mqtt_client.CallbackAPIVersion.VERSION2,client_id,clean...