Python ESP32 mqtt应用

Python ESP32 mqtt应用

使用esp32连接mqtt服务器并接收发送数据

一、WIFI连接

import network
import time
def wifi_connect():
    wifi_times=0
    wlan=network.WLAN(network.STA_IF)
    wlan.active(True)
    if not wlan.isconnected():
        print('网络连接中...')
        wlan.connect(wifi_name,wifi_pwd)
        while not wlan.isconnected():
            wifi_times+=1
            time.sleep(1)
            print(wifi_times)
            if wifi_times>=30:
                wlan.active(False)
                break
    ip=wlan.ifconfig()
    print('网络连接成功！')
    print('ip地址：'+ip[0])

二、MQTT连接

from umqtt.simple import MQTTClient

client = MQTTClient('ESP32',mqtt_ip,1883,mqtt_name,mqtt_pwd,60)
def mqtt_connect():
    client.set_callback(sub_cb)#设置回调函数
    client.connect()
    print('mqtt connected')
    client.subscribe(‘test’)  # 订阅test主题
    

三、回调函数

def sub_cb(topic,msg):
    print(topic,msg)

四、发送数据

	client.publish('ESP_001',msg)