5-python库之-paho mqtt通讯

mqtt可以说是显示物联网上面应用十分广泛的协议了，其轻量、简单、开放和易于实现等这些特点。paho也实现了python版的mqtt。

1.连接

连接调用connect接口，然后调用loop_forever后就开始跑了

connect的第三个参数为mqtt的心跳时间

on_connect和on_disconnect为连接成功和断开的回掉函数，

import paho.mqtt.client as mqtt

mqttClient = mqtt.Client("python_test")


def on_disconnect(client, userdata, rc):
    print("mqtt broker lost "+str(rc))


def on_connect(client, userdata, flags, rc):
    print("Connected with result code " + str(rc))


if __name__ == '__main__':
    mqttClient.on_connect = on_connect
    mqttClient.on_disconnect = on_disconnect
    mqttClient.connect("192.168.18.1", 1883, 10)
    mqttClient.loop_forever()
    

2.SSL登录

添加证书，只需要在调用connect函数之前，添加下面两条内容即可。

mqttClient.tls_set(ca_certs="cacert.pem", certfile=None, keyfile=None, cert_reqs=mqtt.ssl.CERT_REQUIRED,
                       tls_version=mqtt.