uPyCraft-micropython教程 · MQTT实现单向远程控制

MQTT简介

原料：
硬件平台：FireBeetle-ESP32 x2
软件平台：uPyCraft 0.21
物联网平台：https://iot.dfrobot.com.cn（这是dfrobot的建议物联网，后面我们会在上面增加更多有趣功能）

假定一个ESP32是设备A，另一个ESP32是设备B, 我们要实现的功能
B定时向A发送开灯关灯命令，间隔三秒

开始干活
第一步：注册物联网网站账号，https://iot.dfrobot.com.cn
这里需要填入邮箱地址，后期使用邮箱地址登录，注册很简单，这里就不上图了。
第二步：创建设备,记录user password clientid topic，要替换到程序中去

uPyCraft-micropython教程（dfrobot MQTT实现单向远程控制）图1

uPyCraft-micropython教程（dfrobot MQTT实现单向远程控制）图1

第三步：在lib目录下创建umqtt目录，再将uPy_lib/umqtt目录下的simple.py拖动到lib/umqtt目录下，完成库的烧录（设备A和设备B都要做此操作）
新建目录 uPyCraft-micropython教程（dfrobot MQTT实现单向远程控制）图2

uPyCraft-micropython教程（dfrobot MQTT实现单向远程控制）图2

输入新建的目录名称umqtt
uPyCraft-micropython教程（dfrobot MQTT实现单向远程控制）图4

创建成功

第四部：下载并运行代码

  设备A执行下面程序（注意替换SSID PASSWORD【路由器相关】，username【网站账户】，password【网站密码】，CLIENT_ID【刚记录的clientID后面加个2】，TOPIC【刚记录的TOPIC】）
[mw_shl_code=python,true]from umqtt.simple import MQTTClient
from machine import Pin,Timer
import network
import time

SSID="DFROBOT_AP"
PASSWORD="12345678"

led=Pin(2, Pin.OUT, value=0)

SERVER = "182.254.130.180"
CLIENT_ID = "S1grx_VmNW2"
TOPIC_LEDA = b"B1rl_47NZ"
username='H1UGxqD4-'
password='BkeLGeqvVb'
state = 0
def sub_cb(topic, msg):
global state
print((topic, msg))
if msg == b"on":
         led.value(0)
         state = 0
         print("1")
elif msg == b"off":
         led.value(1)
         state = 1
         print("0")
elif msg == b"toggle":
         # LED is inversed, so setting it to current state
         # value will make it toggle
         led.value(state)
         state = 1 - state
def connectWifi(ssid,passwd):
  global wlan
  wlan=network.WLAN(network.STA_IF)
  wlan.active(True)
  wlan.disconnect()
  wlan.connect(ssid,passwd)
  while(wlan.ifconfig()[0]=='0.0.0.0'):
time.sleep(1)

connectWifi(SSID,PASSWORD)
server=SERVER
c = MQTTClient(CLIENT_ID, server,0,username,password)
c.set_callback(sub_cb)
c.connect()
c.subscribe(TOPIC_LEDA)
print("Connected to %s, subscribed to %s topic" % (server, TOPIC_LEDA))
try:
  while 1:
c.wait_msg()
finally:
  c.disconnect()
[/mw_shl_code]

  设备B执行下面程序（注意替换SSID PASSWORD【路由器相关】，username【网站账户】，password【网站密码】，CLIENT_ID【刚记录的clientID后面加个1】，TOPIC_LEDB【刚记录的TOPIC】）
[mw_shl_code=python,true]from umqtt.simple import MQTTClient
from machine import Pin,Timer
import network
import time

SSID="DFROBOT_AP"
PASSWORD="12345678"

led=Pin(2, Pin.OUT, value=0)
tim = Timer(-1)

SERVER = "182.254.130.180"
CLIENT_ID = "S1grx_VmNW2"
TOPIC_LEDA = b"B1rl_47NZ"
username='H1UGxqD4-'
password='BkeLGeqvVb'

def connectWifi(ssid,passwd):
  global wlan
  wlan=network.WLAN(network.STA_IF)
  wlan.active(True)
  wlan.disconnect()
  wlan.connect(ssid,passwd)
  while(wlan.ifconfig()[0]=='0.0.0.0'):
time.sleep(1)

connectWifi(SSID,PASSWORD)
server=SERVER
c = MQTTClient(CLIENT_ID, server,0,username,password)
c.connect()
print("Connected to %s, publish message to %s topic" % (server, TOPIC_LEDA))
try:
  while 1:
c.publish(TOPIC_LEDA,b'on')
time.sleep(3)
c.publish(TOPIC_LEDA,b'off')
time.sleep(3)
finally:
  c.disconnect()
[/mw_shl_code]

第五步：运行设备A程序，运行设备B程序。A每3秒向B发送一次开关指令，B的led灯不停的闪烁

MicroPython教程

uPyCraft-micropython教程（dfrobot MQTT实现单向远程控制）

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