micropython阿里云连接接口

Micropython 提供了一些网络连接库，可以用来连接阿里云。以下是一个简单的阿里云连接示例：

import network
import socket
import time
import ubinascii
import ujson
from umqtt.simple import MQTTClient

# WiFi 配置
WIFI_SSID = "your_wifi_ssid"
WIFI_PASSWORD = "your_wifi_password"

# 阿里云 MQTT 配置
ALIYUN_SERVER = "xxx.iot-as-mqtt.cn-shanghai.aliyuncs.com"
ALIYUN_PORT = 1883
ALIYUN_CLIENT_ID = "your_client_id"
ALIYUN_USERNAME = "your_username"
ALIYUN_PASSWORD = "your_password"
ALIYUN_TOPIC = "/a1xxxxx/xxxxx/xxxxx"

# WiFi 连接
sta_if = network.WLAN(network.STA_IF)
sta_if.active(True)
sta_if.connect(WIFI_SSID, WIFI_PASSWORD)

while not sta_if.isconnected():
    time.sleep(1)

print("WiFi connected, IP:", sta_if.ifconfig()[0])

# MQTT 连接
client_id = ubinascii.hexlify(machine.unique_id())
client = MQTTClient(client_id, ALIYUN_SERVER, ALIYUN_PORT, ALIYUN_CLIENT_ID, ALIYUN_USERNAME, ALIYUN_PASSWORD)

def on_connect(client):
    print("Connected to MQTT server")
    client.subscribe(ALIYUN_TOPIC)

def on_message(client, topic, message):
    print("Received message:", message)
    # 处理接收到的消息

client.set_callback(on_message)
client.connect()
client.set_last_will(ALIYUN_TOPIC, ujson.dumps({"status": "offline"}))
client.subscribe(ALIYUN_TOPIC)
client.publish(ALIYUN_TOPIC, ujson.dumps({"status": "online"}))

# 循环等待消息
while True:
    client.check_msg()
    time.sleep(1)

在这个示例中，首先连接 WiFi，然后连接到阿里云 MQTT 服务器，并订阅指定的主题。当接收到消息时，调用 `on_message` 函数进行处理。最后，进入循环等待消息的状态。