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我用由 LED 组成的 Raspberry Pi 构建了一个小型设置。我已成功地将我的 Pi 与 Bluemix 连接起来。我编写了一个小代码，用于打开和关闭来自 mybluemix.net 网页的 LED（函数 myCommandcallback）。

import RPi.GPIO as GPIO
import time
import os, json
import ibmiotf.application
import uuid

GPIO.setmode(GPIO.BCM)
GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(17, GPIO.OUT)

client = None

def myCommandCallback(cmd):
    if cmd.event == "light":
        payload = json.loads(cmd.payload)
        command = payload["command"]
        print command
        if command == "on":
            GPIO.output(17, GPIO.HIGH)
        elif command == "off":
            GPIO.output(17, GPIO.LOW)

try:
    options = ibmiotf.application.ParseConfigFile("/home/pi/device.cfg")
    options["deviceId"] = options["id"]
    options["id"] = "aaa" + options["id"]
    client = ibmiotf.application.Client(options)
    client.connect()
    client.deviceEventCallback = myCommandCallback
    client.subscribeToDeviceEvents(event="light")

    while True:
        GPIO.wait_for_edge(18, GPIO.FALLING)
        print "Button Pushed"
        myData = {'buttonPushed' : True}
        client.publishEvent("raspberrypi", options["deviceId"], "input", "json", myData)
        time.sleep(0.2)

except ibmiotf.ConnectionException  as e:
    print e

当我点击网页上的按钮打开 LED 时，IBM IoT 平台上的传感器信息显示“灯亮”，但 LED 并没有真正打开。如果收到信息，是否可以检查 Pi？

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