在ESP32上使用umqtt接入阿里云物联网平台

网络上已经有使用python 模拟设备接入阿里云，手里刚好有块ESP32的小板子，在上面跑过Alios Things，然后接入阿里云。但是终究感觉麻烦，有的时候只是做一个很简单的应用，跑os确实不太方便。使用micropython直接操作ESP32很是方便，就想着如果能通过micropython 直接接入物联网，那就方便多了。可以非常简单地接入云端，而且操作简单。先放上主干部分，有时间再补充细节

from umqtt.simple import MQTTClient
import usocket as socket
import time
import wifi

wifi.connect()

#Demo_01
ProductKey = "a1Mf4HZ5k**"
ClientId = "1234|securemode=3,signmethod=hmacsha1|"
DeviceName = "Demo_01"
DeviceSecret = "****************************"

strBroker = ProductKey + ".iot-as-mqtt.cn-shanghai.aliyuncs.com"
Brokerport = 1883

user_name = "Demo_01&a1Mf4HZ5k**"
user_password = "***************************************"

print("clientid:",ClientId,"\n","Broker:",strBroker,"\n","User Name:",user_name,"\n","Password:",user_password,"\n")


def connect():
	client = MQTTClient(client_id = ClientId,server= strBroker,port=Brokerport,user=user_name, password=user_password,keepalive=60) 
	#please make sure keepalive value is not 0
	
	client.connect()

	temperature =25.00
	while temperature < 30:
		temperature += 0.5		
	
		send_mseg = '{"params": {"IndoorTemperature": %s},"method": "thing.event.property.post"}' % (temperature)
		client.publish(topic="/sys/a1Mf4HZ5kET/Demo_01/thing/event/property/post", msg=send_mseg,qos=1, retain=False)
		
		time.sleep(3)

	while True:
		pass

	#client.disconnect()

连接成功后和可以在设备运行状态下看到上传的温度数据

demo中做了一个温度递增的上传，以下是数据记录：

做的过程中参考了一下链接，放在这里，读者可以阅读，以获得更多细节：

子设备接入

https://help.aliyun.com/document_detail/66641.html

ESP8266 and MicroPython - Part 2

https://www.home-assistant.io/blog/2016/08/31/esp8266-and-micropython-part2/

使用MQTT客户端连接阿里云MQTT服务器

https://yq.aliyun.com/articles/592279

使用Python模拟设备接入阿里云物联网的MQTT服务器

https://yq.aliyun.com/articles/162978