Cannot get a Smart Home Contact Sensor change to trigger a routine

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ChrisB asked · Feb 13 at 04:56 PM

Cannot get a Smart Home Contact Sensor change to trigger a routine

Our backend, is sending ChangeReport via POSTs to https://api.amazonalexa.com/v3/events, but they are not triggering routines in the Alexa App

The POSTs are accepted by virtue of the HTTP 202 response codes

The content of the ChangeReport is attached

The documentation I followed is here: https://developer.amazon.com/blogs/alexa/post/bda9d70c-2f0d-454d-9939-2eb82868cf35/announcing-contact-and-motion-sensor-apis-and-integration-into-alexa-routines-adding-new-home-automation-features-for-customers-and-new-opportunities-for-smart-home-developers

and here: https://developer.amazon.com/docs/smarthome/build-smart-home-skills-for-sensors.html contact-sensor-ChangeReport.txt

certification smart home

contact-sensor-changereport.txt (1.5 kB)

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3 Answers

Answer 1 · 2019-02-18T17:44:30Z

nick.madge answered · Feb 18 at 05:44 PM · ACCEPTED ANSWER

Hi there - here's my payload for a motion sensor which is working - if it helps. (BTW Can we please get Motion Sensor's outside the US? - thanks, love, the Rest Of The World)

{
  "context": {},
  "event": {
    "header": {
      "messageId": "9091149208900",
      "namespace": "Alexa",
      "name": "ChangeReport",
      "payloadVersion": "3"
    },
    "endpoint": {
      "scope": {
        "type": "BearerToken",
        "token": "TOKENHERE"
      },
      "endpointId": "352"
    },
    "payload": {
      "change": {
        "cause": {
          "type": "PHYSICAL_INTERACTION"
        },
        "properties": [
          {
            "namespace": "Alexa.MotionSensor",
            "name": "detectionState",
            "value": "NOT_DETECTED",
            "timeOfSample": "2019-02-18T17:42:28.888Z",
            "uncertaintyInMilliseconds": 100
          }
        ]
      }
    }
  }
}

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ChrisB · Feb 18 at 10:04 PM

@nick.madge Thanks. I'll try that.

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ChrisB · Feb 19 at 12:07 PM

@nick.madge was correct. I was using the wrong event format. What confused me was the fact that the events were receiving http 202 response codes from the Alexa event service.

I find the JSON namespace very confusing . It has seemingly similar messages that have very different formats.

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nick.madge ChrisB · Feb 19 at 12:49 PM

Really glad it helped. I have struggled also to work out the format, as the documentation and examples are sketchy. As you say, the 202 is misleading as well.

I believe you can see the change report message more clearly in the console if you enable testing ( I can't do this for some reason)

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Answer 2 · 2019-02-18T16:36:30Z

ChrisB answered · Feb 18 at 04:36 PM

@NorthernMan54. Thank you but I beg to to differ.

The endpoint Id is in the JSON payload, as a child of the endpoint JSON node, which, in turn is a child of the event JSON node.

It appears, to me, to be at the same place in node hierarchy as is seen here: https://developer.amazon.com/docs/smarthome/state-reporting-for-a-smart-home-skill.html#report-state-with-changereport-events

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Answer 3 · 2019-02-16T13:18:52Z

NorthernMan54 answered · Feb 16 at 01:18 PM

Looking at your change report message, your missing the endpointid. So the backend doesn’t know which device the message is for.

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ChrisB · Feb 18 at 04:40 PM

@NorthernMan54

Thanks but I beg to differ. It is a child of the endpoint JSON node which is, in turn, a child of the event JSON node. Its value is "204506798:1:s"

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Cannot get a Smart Home Contact Sensor change to trigger a routine

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