I have set up a project on Actions On Google with which I should be able to add a thermostat to my Google Assistant. Adding it to Google Home doesn't work, however, any idea why?
In the develop-tab, I have added:
- a fulfillment URL
- Client ID & secret
- Authorization & Token URL
Via the authorization URL, I was able to (stub) log on, and return the required tokens as such:
{"token_type":"bearer","access_token":"123access","expires_in":86400}
Upon returning the tokens, I receive a SYNC call with the request ID, as expected. I return the following.
{"payload":{"agentUserId":"sampleClientId","devices":[{"traits":["action.devices.traits.TemperatureSetting"],"willReportState":true,"attributes":{"availableThermostatModes":["off","heat","cool","heatcool","on"],"thermostatTemperatureRange":{"maxThresholdCelsius":30,"minThresholdCelsius":15},"thermostatTemperatureUnit":"F"},"id":"123","type":"action.devices.types.THERMOSTAT","deviceInfo":{"swVersion":"11.4","model":"hs1234","manufacturer":"smart-home-inc","hwVersion":"3.2"}}]},"requestId":"16241058020468313677"}
This json structure came from the documentation on thermostats. However, once the request finishes, I just receive 3 more SYNC calls with the exact same result. My Google Home and Assistant apps first tell me adding the device worked, and 3 seconds later notify me that something went wrong after all. I don't get an error code from Google, so I'm not sure what I'm doing wrong. The 'agentUserId' property is the client ID I added to the Actions on Google console, since I wasn't sure what I had to add there.
I'll add the most important code below to be complete.
The onSync(..) method:
@NotNull
@Override
public SyncResponse onSync(@NotNull SyncRequest syncRequest, @Nullable Map<?, ?> headers) {
SyncResponse res = new SyncResponse();
res.setRequestId(syncRequest.requestId);
res.setPayload(new SyncResponse.Payload());
String token = (String) headers.get("authorization");
String user = TokenServlet.user.getUserId();
res.payload.agentUserId = user;
List<DevicesItem> devices = TokenServlet.user.getDevices();
int numOfDevices = devices.size();
res.payload.devices = new SyncResponse.Payload.Device[numOfDevices];
for (int i = 0; i < numOfDevices; i++) {
DevicesItem device = devices.get(i);
SyncResponse.Payload.Device.Builder deviceBuilder =
new SyncResponse.Payload.Device.Builder()
.setId(device.getId())
.setType(device.getType())
.setTraits(device.getTraits())
.setWillReportState(device.isWillReportState())
.setDeviceInfo(
DeviceProto.DeviceInfo.newBuilder()
.setManufacturer(device.getDeviceInfo().getManufacturer())
.setModel(device.getDeviceInfo().getModel())
.setHwVersion(device.getDeviceInfo().getHwVersion())
.setSwVersion(device.getDeviceInfo().getSwVersion())
.build())
;
if (!Objects.isNull(device.getAttributes())) {
String attributesJson = new Gson().toJson(device.getAttributes());
Struct.Builder attributeBuilder = Struct.newBuilder();
try {
JsonFormat.parser().ignoringUnknownFields().merge(attributesJson, attributeBuilder);
} catch (Exception e) {
LOGGER.error("FAILED TO BUILD");
}
deviceBuilder.setAttributes(attributeBuilder.build());
}
res.payload.devices[i] = deviceBuilder.build();
}
return res;
}
question from:
https://stackoverflow.com/questions/65598941/actions-on-google-doesnt-add-test-device-after-sync-call 
