MQTT實務

MQTT是一個非常方便的訊息傳輸協定，很棒的是，NodeMCU的MicroPython居然也有支援相關的模組可以直接套用喔。

先來段程式碼：

from umqtt.simple import MQTTClient
from machine import Pin, Timer
import time
import dht

def m(t):
	d.measure()
	c = MQTTClient("umqtt_client", "your IP")
	c.connect()
	c.publish(b"skynettw/dorm", 
		b"{},{}%".format(
			d.temperature(), d.humidity()))
	c.disconnect()

d = dht.DHT11(Pin(5))
t = Timer(0)
t.init(period=5000, mode=Timer.PERIODIC, callback=m)
try:
	pass
except:
	d.dinit()