Paho MQTT 客户端连接可靠性（断开重连）

Question

使用 Python Paho MQTT 客户端最可靠的方法是什么？我希望能够处理因 WiFi 掉线而导致的连接中断，并继续尝试重新连接直到成功。

我有以下内容，但是否有任何我没有遵守的最佳实践？

import argparse
from time import sleep

import paho.mqtt.client as mqtt


SUB_TOPICS = ("topic/something", "topic/something_else")
RECONNECT_DELAY_SECS = 2


def on_connect(client, userdata, flags, rc):
    print "Connected with result code %s" % rc
    for topic in SUB_TOPICS:
        client.subscribe(topic)

# EDIT: I've removed this function because the library handles
#       reconnection on its own anyway.
# def on_disconnect(client, userdata, rc):
#     print "Disconnected from MQTT server with code: %s" % rc
#     while rc != 0:
#         sleep(RECONNECT_DELAY_SECS)
#         print "Reconnecting..."
#         rc = client.reconnect()


def on_msg(client, userdata, msg):
    print "%s %s" % (msg.topic, msg.payload)


if __name__ == "__main__":
    p = argparse.ArgumentParser()
    p.add_argument("user")
    p.add_argument("password")
    p.add_argument("host")
    p.add_argument("--port", type=int, default=1883)
    args = p.parse_args()

    client = mqtt.Client()
    client.on_connect = on_connect
    client.on_message = on_msg
    client.username_pw_set(args.user, args.password)
    client.connect(args.host, args.port, 60)
    client.loop_start()

    try:
        while True:
            sleep(1)
    except KeyboardInterrupt:
        pass
    finally:
        client.loop_stop()

Answer 1

设置 client_id 以便在重新连接时相同
设置 clean_session=false 连接选项
订阅 QOS 大于 0

这些选项将有助于确保断开连接时发布的任何消息都将在连接恢复后传送。

您可以在构造函数中设置 client_id 和 clean_session 标志

client = mqtt.Client(client_id="foo123", clean_session=False)

并在主题后设置订阅的QOS

client.subscribe(topic, qos=1)

Paho MQTT 客户端连接可靠性（断开重连）

Paho MQTT client connection reliability (reconnect on disconnection)

python

mqtt

paho