Question

我有以下代码用于mqtt客户端从代理接收消息。如果客户端与代理断开连接，则客户端会再次使用This is some textfoobar调用尝试与代理连接。我读过paho文档，说connect()将处理与经纪人的重新连接。如果使用loop_start()调用与代理重新连接或由connect()本身处理它是否正确，请告诉我。

loop_start()

Answer 1

好的，所以如果你使用loop_forever函数，Paho客户端只会重新连接。

因此，如果您想要控制网络循环，那么您可以始终使用reconnect函数重新连接，而不是拆除整个连接。但最简单的方法是使用loop_forever函数，如下所示：

import paho.mqtt.client as mqtt
import json

# The callback for when the client receives a CONNACK response from the server.
def on_connect(client, userdata, flags, rc):
    print("Connected with result code "+str(rc))
    # Subscribing in on_connect() means that if we lose the connection and
    # reconnect then subscriptions will be renewed.
    client.subscribe("#")

# The callback for when a PUBLISH message is received from the server.
def on_message(client, userdata, msg):
    print("Message received on "+msg.topic)
    parsed_message = json.loads(msg.payload)
    print(json.dumps(parsed_message, indent=4, sort_keys=True))

def on_disconnect(client, userdata, rc):
    if rc != 0:
        print "Unexpected disconnection." , (rc)

# Blocking call that processes network traffic, dispatches callbacks and
# handles reconnecting.
# Other loop*() functions are available that give a threaded interface and a
# manual interface.
client = mqtt.Client(client_id='testing_purpose', clean_session=False)
client.on_connect = on_connect
client.on_message = on_message
client.on_disconnect = on_disconnect
client.loop_forever()

mqtt客户端问题

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