我的问题是如何比较每个主题的当前发布值与以前发布的值,并决定是否向设备发送命令以打开/关闭。 如果状态从以前的状态改变了,我想把命令发送到light,否则不会发送任何命令。 我有以下代码。在
import paho.mqtt.client as mqtt #import the client1
import time
def on_message(client, userdata, message):
print("message received " ,str(message.payload.decode("utf-8")))
print("message topic=", message.topic)
print("message qos=",message.qos)
print("message retain flag=",message.retain)
def on_connect(client, userdata, flags, rc):
print("Connected with result code "+str(rc))
broker_address="127.0.0.1"
print("creating new instance")
client = mqtt.Client("P1")
client.on_connect=on_connect
client.on_message=on_message
print("connecting to broker")
client.connect(broker_address) #connect to broker
client.loop_start()
print("Subscribing to all topics")
client.subscribe("#")
print("Publishing message to topic","house/bulbs/bulb1")
client.publish("house/bulbs/bulb1","OFF",qos=0,retain=true)
client.publish("house/bulbs/bulb1","ON",qos=0,retain=true)
print("Publishing message to topic", "house/bulbs/bulb2")
client.publish("house/bulbs/bulb2", "ON")
client.publish("house/bulbs/bulb2", "ON")
time.sleep(4) # wait
client.loop_stop() #stop the loop
唯一的方法是在代码中存储状态,并将传入的消息与存储的值进行比较。在
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