python-3.x - 使用 MQTT 传感器读数刷新 GUIZERO 文本。还没有正确更新
问题描述
因此，我正在开发一个 UI 项目，用于我自己的个人学习和充实。UI 需要能够使用 MQTT 发布的最新传感器读数来刷新其文本。我已经编写了一个简单的测试脚本来熟悉我将使用的工具，但是现在我的文本并没有随着即将到来的新读数而刷新。此外，我什至没有确定正在接收消息，当发布关于同一主题的消息时，控制台中不会显示任何内容。
这是我的代码：
from guizero import App, Text, TextBox, PushButton, Window, Box, Picture, Slider
import paho.mqtt.client as mqtt
sensorReading = ''
#######################################
def on_connect(client, userdata):
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("room/temperature")
#######################################
#######################################
def on_message(client, userdata, message):
global sensorReading
sensorReading = str(message.payload)
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 updateReading():
client.publish('room/temperature','84')
reading.value = sensorReading
reading.after(1000,updateReading)
########################################
brokerAddress = 'redacted'
client = mqtt.Client('GG1')
print("connecting to broker")
try:
client.connect(brokerAddress, port=1883)
print('Connection Successful!')
except:
print('Connection Failed')
exit(1)
client.on_message=on_message #attach function to callback
print("Subscribing to topic","room/temperature")
app = App(title='Admin Page Test', layout='auto', height=480,width=640)
app.bg = 'white'
client.loop_start()
welcomeText = Text(app, text='Welcome!', size=40, font='Times New Roman', color='darkgreen', align='top')
clientReading = Text(app,text='Latest Reading is: ')
reading=Text(app,text='****')
reading.after(1000, updateReading)
client.loop_stop()
app.display()
我知道这是我对这个系统背后的逻辑理解的错误，我只是不知道我错了哪一部分。感谢您的时间。