带有 Raspberry Pi 和 Bluemix 的 IoT Python 应用程序：无法打开 on/off 灯并使用按钮发送消息

Question

我完成了以下教程，使用 IoT Foundation 将我的 Raspberry Pi 与 Bluemix 上的应用程序连接起来：

https://developer.ibm.com/bluemix/2015/04/02/tutorial-using-a-raspberry-pi-python-iot-twilio-bluemix/

除了 client.py（教程中的第 36 步），我已经准备好了所有东西运行。我收到以下错误消息：

client.py:9: RuntimeWarning: This channel is already in use, continuing anyway.  Use GPIO.setwarnings(False) to disable warnings.
  GPIO.setup(17, GPIO.OUT)
Traceback (most recent call last):
  File "client.py", line 23, in <module>
    options = ibmiotf.application.ParseConfigFile("/home/pi/device.cfg")
  File "/usr/local/lib/python2.7/dist-packages/ibmiotf/application.py", line 501, in ParseConfigFile
    appType = parms.get(sectionHeader, "type", "standalone")
  File "/usr/lib/python2.7/ConfigParser.py", line 618, in get
    raise NoOptionError(option, section)
ConfigParser.NoOptionError: No option 'type' in section: 'application'

我发现错误来自配置文件 (device.cfg) 中缺少的 "type" 部分。

本教程第 35 步中列出的文件结构并未说明您需要 "type"。我用的是之前在物联网基金会创建的设备类型（raspberrypi）

现在我确实成功连接到 IoT Foundation。

我现在遇到的问题是，当我按下我的 Raspberry Pi 按钮或网络应用程序的 "Turn light on/off" 按钮时，没有任何反应。

如果我使用“./cf logs myappname -recent”检查 python 应用程序的日志，我会得到以下输出：

2016-01-29T08:38:49.10+0100 [App/0]      OUT on
2016-01-29T08:38:49.10+0100 [App/0]      ERR 75.126.37.74 - - [29/Jan/2016 07:38:49] "POST /light/on HTTP/1.1"; 302 -
2016-01-29T08:38:49.34+0100 [App/0]      ERR 75.126.52.20 - - [29/Jan/2016 07:38:49] "GET / HTTP/1.1"; 200 -
2016-01-29T08:38:49.56+0100 [RTR/1]      OUT myappname.mybluemix.net - [29/01/2016:07:38:49 +0000] "GET / HTTP/1.1" 200 0 751 "http://myappname.mybluemix.net/&quot; ";Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.111 Safari/537.36" 108.168.250.151:39460 x_forwarded_for:&quot;46.5.2.236"x_forwarded_proto:"http&quot; vcap_request_id:myrequestid response_time:0.31228492 app_id:myapp_id x_global_transaction_id:mytransactionid;
2016-01-29T08:40:08.32+0100 [App/0]      OUT off
2016-01-29T08:40:08.33+0100 [App/0]      ERR 75.126.37.74 - - [29/Jan/2016 07:40:08] "POST /light/off HTTP/1.1" 302 -
2016-01-29T08:40:08.51+0100 [App/0]      ERR 75.126.23.243 - - [29/Jan/2016 07:40:08] "GET / HTTP/1.1" 200 -`

本教程的作者 Jeff 说我应该仔细检查 Pi 和 Bluemix 中的应用程序是否都在收听同一主题。在 IoT 服务中，我应该能够看到通过的消息。

我不知道这意味着什么，也不知道我该怎么做。

我们已经在博客 post (https://www.youtube.com/watch?v=YHDhn5hGnn8) 的 youtube 视频的评论部分讨论了我的问题，Jeff 告诉我我们应该将它转移到 Whosebug（有道理).

感谢您的帮助。

// 编辑以获取更多信息 // 这是我在 Pi 上获得的输出，当我启动应用程序时：须藤 python client.py

2016-02-01 14:36:23,221   ibmiotf.application.Client  WARNING Unable to encrypt messages because TLSv1.2 is unavailable (MQTT over SSL requires at least Python v2.7.9 or 3.4 and openssl v1.0.1)
2016-02-01 14:36:23,716   ibmiotf.application.Client  INFO    Connected successfully: A:69wm3f:aaaafdsfsd45641safsda2313

如果我在客户端启动后第一次按下 on/off 按钮，我会在 Pi 上得到以下输出：

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 2287, in _thread_main
    self.loop_forever()
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 1261, in loop_forever
    rc = self.loop(timeout, max_packets)
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 811, in loop
    rc = self.loop_read(max_packets)
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 1073, in loop_read
    rc = self._packet_read()
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 1475, in _packet_read
    rc = self._packet_handle()
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 1943, in _packet_handle
    return self._handle_publish()
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 2118, in _handle_publish
    self._handle_on_message(message)
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 2268, in _handle_on_message
    t[1](self, self._userdata, message)
  File "/usr/local/lib/python2.7/dist-packages/ibmiotf/application.py", line 423, in __onDeviceEvent
    if self.deviceEventCallback: self.deviceEventCallback(event)
  File "client.py", line 17, in myCommandCallback
    command = cmd.payload["d"]["command"]
TypeError: string indices must be integers, not str

看起来来自 IoT Foundation 的消息正在到达客户端。

我在 IoT Foundation、Bluemix Python 应用程序的环境变量和 Raspberry Pi 上设置了以下 ID：

物联网基金会 ID：afdsfsd45641safsda2313
Bluemix Python 应用程序 ID：afdsfsd45641safsda2313
Raspberry Pi device.cfg 中的 ID：afdsfsd45641safsda2313

三个ID都一样

// 编辑 2 // 添加评论部分的 print cmd 语句后的日志输出：

<ibmiotf.application.Event instance at 0x76526738>
light
{"command": "on"}

更改后的堆栈跟踪

command = cmd.payload["d"]["command"]

到

command = cmd.payload["command"]

Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 552, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 505, in run
    self.__target(*self.__args, **self.__kwargs)
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 2287, in _thread_main
    self.loop_forever()
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 1261, in loop_forever
    rc = self.loop(timeout, max_packets)
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 811, in loop
    rc = self.loop_read(max_packets)
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 1073, in loop_read
    rc = self._packet_read()
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 1475, in _packet_read
    rc = self._packet_handle()
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 1943, in _packet_handle
    return self._handle_publish()
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 2118, in _handle_publish
    self._handle_on_message(message)
  File "/usr/local/lib/python2.7/dist-packages/paho/mqtt/client.py", line 2268, in _handle_on_message
    t[1](self, self._userdata, message)
  File "/usr/local/lib/python2.7/dist-packages/ibmiotf/application.py", line 423, in __onDeviceEvent
    if self.deviceEventCallback: self.deviceEventCallback(event)
  File "client.py", line 18, in myCommandCallback
    command = cmd.payload["command"]
TypeError: string indices must be integers, not str

Answer 1

原来 IBM IoT Foundation 库的解析方式发生了变化 JSON...

改变line 15

command = cmd.payload["d"]["command"]

到

payload = json.loads(cmd.payload)
command = payload["command"]

Answer 2

我再添加一行 "json.dumps"，它对我有用。

dataraw   = json.dumps(cmd.data)
payload = json.loads(dataraw)
command = payload["command"]

此致

带有 Raspberry Pi 和 Bluemix 的 IoT Python 应用程序：无法打开 on/off 灯并使用按钮发送消息

IoT Python app with a Raspberry Pi and Bluemix: Cannot turn on/off lights and send message using the button

python

ibm-cloud

iot