python mqtt tls_python mqtt使用

在Python中使用MQTT协议进行通信可以使用paho-mqtt库，同时也支持TLS/SSL加密。下面是一个简单的示例程序：

import ssl
import paho.mqtt.client as mqtt

# MQTT连接信息
mqtt_broker = "broker.example.com"
mqtt_port = 8883
mqtt_username = "username"
mqtt_password = "password"

# TLS/SSL证书信息
ca_cert = "/path/to/ca.crt"
client_cert = "/path/to/client.crt"
client_key = "/path/to/client.key"

def on_connect(client, userdata, flags, rc):
    print("Connected with result code " + str(rc))
    client.subscribe("test/topic")

def on_message(client, userdata, msg):
    print(msg.topic + " " + str(msg.payload))

client = mqtt.Client()
client.tls_set(ca_cert, certfile=client_cert, keyfile=client_key, cert_reqs=ssl.CERT_REQUIRED, tls_version=ssl.PROTOCOL_TLSv1_2)
client.username_pw_set(mqtt_username, mqtt_password)
client.on_connect = on_connect
client.on_message = on_message
client.connect(mqtt_broker, mqtt_port, 60)
client.loop_forever()

在此示例中，我们导入了`ssl`和`paho.mqtt.client`库，然后设置MQTT连接信息和TLS/SSL证书信息。在`on_connect`和`on_message`函数中，我们定义了当连接成功和收到消息时的行为。最后，我们创建了一个MQTT客户端对象，设置TLS/SSL证书，连接到MQTT代理，并开始循环以处理所有MQTT事件。

如果您没有TLS/SSL证书，可以使用以下代码禁用TLS/SSL加密：

import paho.mqtt.client as mqtt

# MQTT连接信息
mqtt_broker = "broker.example.com"
mqtt_port = 1883
mqtt_username = "username"
mqtt_password = "password"

def on_connect(client, userdata, flags, rc):
    print("Connected with result code " + str(rc))
    client.subscribe("test/topic")

def on_message(client, userdata, msg):
    print(msg.topic + " " + str(msg.payload))

client = mqtt.Client()
client.username_pw_set(mqtt_username, mqtt_password)
client.on_connect = on_connect
client.on_message = on_message
client.connect(mqtt_broker, mqtt_port, 60)
client.loop_forever()

在此示例中，我们将MQTT端口设置为1883，并禁用了TLS/SSL加密。