Esp8266 mqtt

以下是关于Esp8266 mqtt的介绍和演示：

Esp8266是一款低成本、低功耗的Wi-Fi模块，可以用于物联网应用。MQTT（Message Queuing Telemetry Transport）是一种轻量级的消息传输协议，常用于物联网设备之间的通信。

1. Esp8266连接到MQTT服务器[^1]：

import machine
from umqtt.simple import MQTTClient

# 设置Wi-Fi连接信息
SSID = "your_wifi_ssid"
PASSWORD = "your_wifi_password"

# 设置MQTT服务器信息
SERVER = "your_mqtt_server"
PORT = 1883
CLIENT_ID = "esp8266"

# 连接Wi-Fi
station = machine.WLAN(machine.STA_IF)
station.active(True)
station.connect(SSID, PASSWORD)

# 连接MQTT服务器
client = MQTTClient(CLIENT_ID, SERVER, PORT)
client.connect()

# 订阅主题
topic = b"lkwMQTTtopic"
client.subscribe(topic)

# 发布消息
message = b"Hello, MQTT!"
client.publish(topic, message)

# 断开连接
client.disconnect()

2. 使用自己搭建的MQTT服务器：

import machine
from umqtt.simple import MQTTClient

# 设置Wi-Fi连接信息
SSID = "your_wifi_ssid"
PASSWORD = "your_wifi_password"

# 设置MQTT服务器信息
SERVER = "your_mqtt_server"
PORT = 1883
CLIENT_ID = "esp8266"

# 连接Wi-Fi
station = machine.WLAN(machine.STA_IF)
station.active(True)
station.connect(SSID, PASSWORD)

# 连接MQTT服务器
client = MQTTClient(CLIENT_ID, SERVER, PORT)
client.connect()

# 订阅主题
topic = b"lkwMQTTtopic"
client.subscribe(topic)

# 发布消息
message = b"Hello, MQTT!"
client.publish(topic, message)

# 断开连接
client.disconnect()