Python paho mqtt客户端不会同时发布和订阅

Question

当我通过 MQTTLens 测试发布时，它有效。然而，当我按下一个按钮时，它确实触发了 "on_publish" 但在另一端的 on_message 没有收到任何东西；它没有被触发。有两个Raspberry Pi的运行相同的脚本，唯一的区别是他们的经纪人IP和主题是相反的。

import RPi.GPIO as io
import os
import json
from time import sleep
import paho.mqtt.client as mqtt
import paho.mqtt.publish as publish

############### MQTT section ##################

Broker = "192.168.1.10"

rcv_topic = "home/groundfloor/livingroom/lights/lightx"    # receive messages on this topic
snd_topic = "home/groundfloor/kitchen/lights/lightx"       # send messages to this topic

def on_connect(mqttc, obj, flags, rc):
    print("rc: "+str(rc))
    mqttc.subscribe(rcv_topic) #receving/subscriber    

#when receving a message:
def on_message(mqttc, obj, msg):
    print("sub") #this is not being executed on button push, but it is when I publish through the MQTTLens
    print(msg.topic+" "+str(msg.qos)+" "+str(msg.payload))
    try:
        p = msg.payload.decode("utf-8")
        print("decoded payload: " + p)
        x = json.loads(p)
        set_leds(leds, tuple(x['leds'])) #set leds to received value

        return
    except Exception as e:
        print(e)

# callback functie voor publish  event
def on_publish(mqttc, obj, mid):
    print("pub")
    return

mqttc = mqtt.Client()
mqttc.on_message = on_message
mqttc.on_connect = on_connect
mqttc.on_publish = on_publish
mqttc.on_subscribe = on_subscribe
mqttc.connect(Broker, 1883, 60) #last could be a port too
mqttc.loop_start() #client.loop_forever()

############### led&button section ##################
def init_leds(leds):
    io.setup(leds, io.OUT)

def set_leds(leds, states):
    print("leds and states: " + str(leds) + " " + str(states))
    io.output(leds, states)

def snd_msg(led):
    dataToSend=json.dumps({"leds":[led1State,led2State]})
    print("data: " + dataToSend)
    mqttc.publish(snd_topic, dataToSend)

io.add_event_detect(btn1,io.FALLING,callback=lambda *a: snd_msg(1),bouncetime=500)

############### main ##################

def main():
    try:
        while True:
            init_leds(leds)
    except KeyboardInterrupt:
        pass
    finally:
        io.cleanup()

#toplevel script
#below will only execute if ran directly - above is always accessible
if __name__ == '__main__':
    main()

我只包含了我的代码中与我的问题直接相关的部分，并修改了一些代码以使其更短。但是，如果需要更多代码，我可以随时提供。

我意识到这可能是这个的副本，但我已经尝试从答案中推导出我的代码，但它似乎并没有解决我的问题，除非我做错了什么.

Answer 1

正如 hardillb 所建议的（我不确定如何标记某人），我的错误是我使用不同的 IP 作为每个 Rpi 的代理。他们现在都在听 1.10 并且它有效.

You mentioned swapping the broker ips, surely they should both be pointing at the same broker? – hardillb

Answer 2

您似乎在两个不同的 IP 上发布和订阅。为了接收消息，您必须在 IP 192.168.1.10（我假设这是您的 Broker IP）上发布主题 TOPIC_TEST（假设）并在 IP 192.168.1.10 上订阅同一主题 TOPIC_TEST.

Python paho mqtt客户端不会同时发布和订阅

Python paho mqtt client won't publish and subscribe at the same time

python

mqtt

paho