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本文來源電子發燒友社區，作者：soon順soon，帖子地址：https://bbs.elecfans.com/jishu_2010903_1_1.html

本文分享一種利用python搭建MQTT控制WIFI-IoT的紅綠燈測試web頁面的方法，實現按下 web頁面按鍵后會發布topic為ledstatus，payload分別為RedLED、YellowLED、GreenLED的消息，如果剛好有興趣的可以參考下。

WIFI-IoT上收到消息后反轉對應LED 狀態的相關代碼,參閱

MQTT 控制紅綠燈的演示與代碼分享

一、相關的軟件和python庫安裝

ubuntu20.04中搭建MQTT Broker的指令如下

sudo apt-get install mosquitto
sudo apt-get install mosquitto-clients
sudo apt-get install mosquitto-dev

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Ubuntu下用python搭建web會用到的庫安裝指令如下

pip3 install paho.mqtt
pip3 install web.py

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如果是在windows下mqtt的包安裝要換成如下

pip install web.py
pip install paho-mqtt

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二、用html寫個簡單的頁面"key.html"如下

- Wifi-loT測試頁面
- Soon-Wifi-loT
tion="/RedLED" method="POST">

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頁面比較簡潔只有標題和三個按鍵

三、Python相關代碼如下

import web
import paho.mqtt.client
import time
HOSTNAME ="xxxxxx"#請填入你的Broker地址/可以是你局域網ubuntu虛擬機IP，或者云服務器地址
MQTTPORT = 1883#默認1883 具體看你Broker配置
USERNAME ="xxxxxx" #請填入用戶名
PASSWD="xxxxxx"#請填入用密碼
HTML_PAGE = "key.html"
TOPICE = "ledstatus"
mqtt = paho.mqtt.client
urls = (
'/RedLED', 'RedLED',
'/YellowLED', 'YellowLED',
'/GreenLED', 'GreenLED',
'/(.*)', 'Wifi_lOT_home'
)
app = web.application(urls, globals())
client_id = time.strftime('%Y%m%d%H%M%S',time.localtime(time.time()))
client = mqtt.Client(client_id) # ClientId不能重復，所以使用當前時間
# publish 消息
def on_publish(topic, payload, qos):
client.username_pw_set(USERNAME, PASSWD)# 必須設置，否則會返回「Connected with result code 4」
client.connect(HOSTNAME, MQTTPORT, 60)
client.publish(topic, payload, qos)
class Wifi_lOT_home:
def GET(self, name):
file = open(HTML_PAGE, "rb+")
return file.read()
def POST(self):
print ("test soon")
class RedLED:
def POST(self):
print ("RedLED POST")
on_publish(TOPICE, "RedLED".encode(),0)
file = open(HTML_PAGE, "rb+")
return file.read()
class YellowLED:
def POST(self):
print ("YellowLED POST")
on_publish(TOPICE,"YellowLED".encode(),0)
file = open(HTML_PAGE, "rb+")
return file.read()
class GreenLED:
def POST(self):
print ("GreenLED POST")
on_publish(TOPICE,"GreenLED".encode(),0)
file = open(HTML_PAGE, "rb+")
return file.read()
if __name__ == "__main__":
app.run()