HA Cloud + Alexa: thermostat setting transactions are executed but error out at the end: "I am not quite sure what went wrong"

[arigit]

Home Assistant release with the issue:
Home Assistant 0.74.0

Last working Home Assistant release (if known):
N/A

Operating environment (Hass.io/Docker/Windows/etc.):

Raspbian

Component/platform:

https://www.home-assistant.io/components/cloud/

https://www.home-assistant.io/components/alexa/

Description of problem:
I opened an HA Cloud account and added the HA Alexa skill to my alexa account, and linked them.

I exposed the "switch" and "climate" domains to alexa. Alexa's discovery works perfectly.
I can see my thermostat and my switches.

Controlling my switches via voice works fine.

But when I ask alexa to set the temperature to any value via voice (Alexa set the thermostat to 24 degrees), I immediately get “I am not quite sure what went wrong”. However, the actual change in the thermostat is done, HA changes the setting as I asked Alexa to do. This is consistent: every single time I attempt, the change in the thermostat is done, but Alexa "errors out" sayng "I am not quite sure what went wrong".

Before HA Cloud + Alexa, I used the older HAASKA (with V2 payloads), on this same HA server and essentially the same configuation, and it worked perfectly, it never had this problem.

I first enabled HA Cloud with HA 0.73 and the problem was there. Now I updated to 0.74 and same issue.

I checked the logs in HA: no errors. See the debug logs below.

One observation - I notice HA's response to Alexa has an empty payload. There doesn't seem to be a "success" or 200/OK or any indication that the command was succesfull?

Problem-relevant configuration.yaml entries and (fill out even if it seems unimportant):

cloud:     
  alexa:          
    filter:
      include_domains:
        - switch
        - climate
      exclude_entities:
        - switch.wemo_insight

Traceback (if applicable):

HA logs for the  clould & ecobee components
(removed the tokens)

018-07-20 13:46:13 INFO (Thread-16) [homeassistant.components.ecobee] Ecobee data updated successfully
2018-07-20 13:46:34 ERROR (MainThread) [homeassistant.core] Timer got out of sync. Resetting
2018-07-20 13:46:37 INFO (MainThread) [homeassistant.components.cloud.iot] Connected
2018-07-20 13:46:56 DEBUG (MainThread) [homeassistant.components.cloud.iot] Received message:
{'handler': 'alexa',
 'msgid': '9c8f4a49-54fd-4f97-ad64-f02f158d9957',
 'payload': {'directive': {'endpoint': {'cookie': {},
                                        'endpointId': 'climate#thermostat',
                                        'scope': {'token': 'eyJraWQiOiJGTzR4d08xNUJzbDZVVF..........GehvBgbb1IU9_R2uakIfw7qZmg9BWqZgngWLbHchtAw',
                                                  'type': 'BearerToken'}},
                           'header': {'correlationToken': 'AAAAAAAAAAA7N53jmAaeh9qr.............KRzPMfdVIOMwdHupaTuEfCTtmYxt2oR5WQ2vFgISoAWtBmA==',
                                      'messageId': 'fd48b1f8-3f82-41cb-9dd1-8a3834e01d86',
                                      'name': 'SetTargetTemperature',
                                      'namespace': 'Alexa.ThermostatController',
                                      'payloadVersion': '3'},
                           'payload': {'targetSetpoint': {'scale': 'CELSIUS',
                                                          'value': 23.5}}}}}

2018-07-20 13:46:56 DEBUG (MainThread) [homeassistant.components.cloud.iot] Publishing message:
{'msgid': '9c8f4a49-54fd-4f97-ad64-f02f158d9957',
 'payload': {'event': {'endpoint': {'cookie': {},
                                    'endpointId': 'climate#thermostat',
                                    'scope': {'token': 'eyJraWQi.............v7tojSxW7GehvBgbb1IU9_R2uakIfw7qZmg9BWqZgngWLbHchtAw',
                                              'type': 'BearerToken'}},
                       'header': {'correlationToken': 'AAAAAAAAAAA7N53jmAaeh9q........RT4mJXkUN684o9N.......NXhtVSfKtqNj/asH+gupmu47HcKRzPMfdVIOMwdHupaTuEfCTtmYxt2oR5WQ2vFgISoAWtBmA==',
                                  'messageId': '65bc6221-7d90-4d13-9e2a-a3e4ecbde21a',
                                  'name': 'Response',
                                  'namespace': 'Alexa',
                                  'payloadVersion': '3'},
                       'payload': {}}}}

2018-07-20 13:46:57 INFO (Thread-19) [homeassistant.components.ecobee] Ecobee data updated successfully

Additional information:

[arigit]

I took a look at the Alexa smart home API for thermostats,

https://developer.amazon.com/docs/device-apis/alexa-thermostatcontroller.html

It seems pretty clear that the response needs to include some info:

Response

If a request completes successfully, you send a Response event that indicates the setpoints and the current thermostatMode value.

Single setpoint and HEAT mode example

{
  "context": {
    "properties": [ {
      "namespace": "Alexa.ThermostatController",
      "name": "targetSetpoint",
      "value": {
        "value": 25,
        "scale": "CELSIUS"
      },
      "timeOfSample": "2017-02-03T16:20:50.52Z",
      "uncertaintyInMilliseconds": 500
    }, {
      "namespace": "Alexa.ThermostatController",
      "name": "thermostatMode",
      "value": "HEAT",
      "timeOfSample": "2017-02-03T16:20:50.52Z",
      "uncertaintyInMilliseconds": 500
    } ]
  },
  "event": {
    "header": {
      "namespace": "Alexa",
      "name": "Response",
      "payloadVersion": "3",
      "messageId": "5f8a426e-01e4-4cc9-8b79-65f8bd0fd8a4",
      "correlationToken": "dFMb0z+PgpgdDmluhJ1LddFvSqZ/jCc8ptlAKulUj90jSqg=="
    },
    "endpoint": {
      "endpointId": "appliance-001"
    },
    "payload": {}
  }
}

It seems to follow that HA is sending back a response with no context (broken) since it has nothing in it

[trisk]

I'm working on changes to send the full set of properties in responses, similar to Alexa.ReportState.