python mqtt ssl连接

要在Python中使用MQTT SSL连接，您需要遵循以下步骤：

1. 安装paho-mqtt库

pip install paho-mqtt

2. 导入必要的库

import ssl
import paho.mqtt.client as mqtt

3. 创建SSL/TLS上下文

context = ssl.create_default_context()

4. 设置TLS版本和密码套件

context.set_ciphers('DEFAULT@SECLEVEL=2')
context.set_default_verify_paths()
context.set_alpn_protocols(['x-amzn-mqtt-ca'])
context.options |= ssl.OP_NO_TLSv1 | ssl.OP_NO_TLSv1_1

5. 创建MQTT客户端

client = mqtt.Client(client_id="your_client_id")

6. 配置TLS选项

client.tls_set_context(context)

7. 连接到MQTT代理

client.connect("your_broker_address", port=8883)

8. 订阅主题

client.subscribe("your_topic")

9. 发布消息

client.publish("your_topic", "your_message")

完整代码示例：

import ssl
import paho.mqtt.client as mqtt

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

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

context = ssl.create_default_context()
context.set_ciphers('DEFAULT@SECLEVEL=2')
context.set_default_verify_paths()
context.set_alpn_protocols(['x-amzn-mqtt-ca'])
context.options |= ssl.OP_NO_TLSv1 | ssl.OP_NO_TLSv1_1

client = mqtt.Client(client_id="your_client_id")
client.tls_set_context(context)

client.on_connect = on_connect
client.on_message = on_message

client.connect("your_broker_address", port=8883)

client.loop_forever()

请注意，您需要将 "your_client_id"，"your_topic"，"your_message" 和 "your_broker_address" 替换为您自己的值。