Error Response with Google Smart Home (Thermostat) - actions-on-google

Question

I am unable to understand the syntax of Json for errors
I have tried
return {
"requestId": self.request_id,
"payload": {
"commands": [{
"ids": [self.device_id],
"status": "OFFLINE",
"errorCode": "deviceTurnedOff"
}]
}
}
and
return {
"requestId": self.request_id,
"payload": {
"errorCode": "authFailure",
"commands": [{
"devices": [{
"ids": [self.device_id],
"status": "ERROR",
"errorCode": "deviceTurnedOff"
}]
}]
}
}
and
return {
"requestId": self.request_id,
"payload": {
"errorCode": self.error_code
}
}
none of above syntax are working, most of the time google home says that your actions is performed but I am returning error Json there.
I have read google actions documentation but failed to understand.

Answer 1

I have come up with a few payloads and have managed to get them successfully triggering errors using the AoG simulator after consulting the docs.
Node.js snippet:
let resBody = {
requestId: request.requestId,
payload: {
"errorCode": "notSupported"
}
}
response.status(200).json(resBody);
Are you sure that the requestId is the same from the smart home request? How are you testing these errors?