self._shadowSubscribeCallbackTable[srcActionName]("REQUEST TIME OUT", "timeout", srcToken)

[xelfer]

I'm using your SDK to send some sensor data to my IoT device shadow. It usually runs fine but the past day or two I've received this error when I re-attach my screen session:

payload: { "state" : { "reported": { "temp": "19.5", "humid": "55.3" } } }
payload: { "state" : { "reported": { "temp": "19.4", "humid": "55.2" } } }
payload: { "state" : { "reported": { "temp": "19.5", "humid": "55.3" } } }
payload: { "state" : { "reported": { "temp": "19.5", "humid": "55.3" } } }
Exception in thread Thread-6818:
Traceback (most recent call last):
  File "/usr/lib/python2.7/threading.py", line 810, in __bootstrap_inner
    self.run()
  File "/usr/lib/python2.7/threading.py", line 1082, in run
    self.function(*self.args, **self.kwargs)
  File "/usr/local/lib/python2.7/dist-packages/AWSIoTPythonSDK/core/shadow/deviceShadow.py", line 203, in _timerHandler
    self._shadowSubscribeCallbackTable[srcActionName]("REQUEST TIME OUT", "timeout", srcToken)
TypeError: 'str' object is not callable

Any ideas what might be going on here?

My full source is here: https://github.com/xelfer/nickshouse/blob/master/awstemp.py

Thanks,
xelfer

[liuszeng]

Hi @xelfer ,

Thank you very much for using AWS IoT Python SDK!

AWSIoTMQTTShadowClient provides APIs to interact with device shadow in AWS IoT by modifying shadow JSON document through MQTT Publish/Subscribe model. As a result, a callback can be registered to see if the shadow request has been accepted/rejected/timed out. The shadow callback, if need to be specified, should be in the form of customCallback(payload, responseStatus, token) (details available in API doc)

In your source code line33, you have specified the callback to be a string, which is not in forms of shadow callback and is not callable. If you do not want a callback for your shadow request, you can simply assign it with None:

myDeviceShadow.shadowUpdate(tempreading, None, 5)

Note that accepted/rejected callbacks are executed in separate threads other than the main application thread.

Hope that answers your question.

Thanks,
Liusu

[xelfer]

HI Liusu, thank you for the prompt response!

I understand now and have changed my code. Thank you.