标签:Python Demo mqtt MQTT CONNECT print Config def connect
依赖
下载 pahao-mqtt
:
pip install paho-mqtt
引用:
from paho.mqtt import client as MQTTClient
from time import sleep
示例
非匿名连接
初始化数据:
class Config:
BROKER = "[MQTT 服务器 IP 或 域名]"
PORT = [MQTT 服务器端口]
TOPIC = "[主题]"
CLIENT_ID = "[客户端 ID]"
USERNAME = "[用户名]"
PASSWORD = 口令"
CONNECT = None
MESSAGE = "[消息]"
建立连接
def connect_mqtt():
def on_connect(client, userdata, flags, rc):
if rc == 0:
print("Connected to MQTT Broker!")
else:
print("Failed to connect, return code %d\n", rc)
Config.CONNECT = MQTTClient.Client(Config.CLIENT_ID)
Config.CONNECT.username_pw_set(Config.USERNAME, Config.PASSWORD)
Config.CONNECT.on_connect = on_connect
Config.CONNECT.connect(Config.BROKER, Config.PORT)
通过主题发布消息
def publish():
while(True):
sleep(1)
result = Config.CONNECT.publish(Config.TOPIC, Config.MESSAGE)
status = result[0]
if status == 0:
print(f"Send `{Config.MESSAGE}` to topic `{Config.TOPIC}`")
else:
print(f"Failed to send message to topic {Config.TOPIC}")
def app():
connect_mqtt()
publish()
Config.CONNECT.loop_forever()
通过主题订阅消息
def subscribe():
def on_message(client, userdata, msg):
print(f"Received `{msg.payload.decode()}` from `{msg.topic}` topic")
Config.CONNECT.subscribe(Config.TOPIC)
Config.CONNECT.on_message = on_message
def app():
connect_mqtt()
subscribe()
Config.CONNECT.loop_forever()
运行
if __name__ == '__main__':
app()
标签:Python,Demo,mqtt,MQTT,CONNECT,print,Config,def,connect 来源: https://www.cnblogs.com/Yogile/p/16473455.html
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