在MQTT协议中,客户端(Client)可以订阅(Subscribe)一个或多个主题(Topic),服务器(Broker)会将发布(Publish)到这些主题的消息推送给相应的客户端。 on_subscribe 回调是MQTT客户端库中的一个回调函数,当客户端成功订阅一个或多个主题时,该回调会被触发。它允许客户端在订阅成功时执行一些操作,例如记录订阅的主题、...
无需注册PORT=1883# MQTT默认端口号TOPICS=[("sensor/temperature",0),("sensor/humidity",0),("sensor/pressure",0)]# 发布者回调函数defon_connect(client,userdata,flags,rc):print("连接成功,结果代码: {}".format(rc))# 订阅多个主题client.subscribe(TOPICS)# 消息处理函数defon_message(client,userdata...
mqttc = mqtt.Client("test") mqttc.on_message = on_message mqttc.on_connect = on_connect mqttc.on_publish = on_publish mqttc.on_subscribe = on_subscribe mqttc.on_log = on_log # 设置账号密码 # mqttc.username_pw_set(username, password=password) mqttc.connect(strBroker, port, 60) ...
importpaho.mqtt.subscribeassubscribedefon_message_print(client, userdata, message):print("%s %s"% (message.topic, message.payload)) subscribe.callback(on_message_print,"paho/test/callback", hostname="iot.eclipse.org" 参考资料:https://pypi.python.org/pypi/paho-mqtt 作者:whele 来源:简书 著作...
subscribe(("my/topic", 1)) subscribe([("my/topic", 0), ("another/topic", 2)]) 1. 2. 3. 4. unsubscribe( topic ) — 取消订阅 username_pw_set( username, password=None ) —在connect()之前设置client的用户名和密码,依据MQTT配置的mqtt_acl与mqtt_user表中的ACL规则与用户信息进行用户验证...
该书的代码包也托管在 GitHub 上,网址为github.com/PacktPublishing/Hands-On-MQTT-Programming-with-Python。如果代码有更新,将在现有的 GitHub 存储库中更新。 我们还有其他代码包,来自我们丰富的书籍和视频目录,可以在github.com/PacktPublishing/上找到。去看看吧!
def subscribe(client: mqtt_client): def on_message(client, userdata, msg): print(f"Received `{msg.payload.decode()}` from `{msg.topic}` topic") client.subscribe(topic) client.on_message = on_message 完整代码 消息发布代码 # python 3.6 ...
import paho.mqtt.client as mqtt HOST = "bemfa.com" PORT = 9501 client_id = "4d9ec352e0376f2110a0c601a2857225" #连接并订阅 def on_connect(client, userdata, flags, rc): print("Connected with result code "+str(rc)) client.subscribe("led00202") # 订阅消息 ...
subscribe(topic) client.on_message = on_message def run(): client = connect_mqtt() subscribe(client) client.loop_forever() if __name__ == '__main__': run() 测试 消息发布 运行MQTT 消息发布代码,我们将看到客户端连接成功,并且成功将消息发布。 python3 pub.py 消息订阅 运行MQTT 消息订阅...
client = mqtt.Client() # client.username_pw_set("admin", "password") # 回调函数 client.on_connect = on_connect client.on_subscribe = on_subscribe client.on_message = on_message client.on_log = on_log # host为启动的broker地址 举例本机启动的ip 端口默认1883 ...