ResourceProvider does not send response if it's too large

Question

I'm working with Movesense 2.0.0 on Simulator, and I'm implementing my own APIs.
This is (part of) my YAML with the API specification

  /hs/Log/{Log_Id}/Data:
    get:
      description: |
        Function returning Log Data
      responses:
        200:
          description: Log Data
          schema:
            $ref: '#/definitions/LogData'
        404:
          description: Referenced log not found in LogBook.
    parameters:
       - $ref: '#/parameters/Log_Id'

parameters:
  Log_Id:
    name: Log_Id
    in: path
    required: true
    type: integer
    format: int32

definitions:
  LogData:
    required:
      - Data
    properties:
      Data:
        description: Log Data
        type: array
        items:
          type: integer
          format: int32

And this is the overridden method handling it:

void HSService::onGetRequest(const whiteboard::Request& request,
                                     const whiteboard::ParameterList& parameters)
{

    if (mModuleState != WB_RES::ModuleStateValues::STARTED)
    {
        return returnResult(request, wb::HTTP_CODE_SERVICE_UNAVAILABLE);
    }

    switch (request.getResourceConstId())
    {
    case WB_RES::LOCAL::HS_LOG_LOG_ID_DATA::ID:
    {
            WB_RES::LogData resp;
            int32_t tmp[128] = { 0 };
            resp.data = wb::MakeArray<int32_t>(tmp, 128);
             return returnResult(request, whiteboard::HTTP_CODE_OK, ResponseOptions::Empty, resp);
        }
    }
    break;

    default:
        return returnResult(request, whiteboard::HTTP_CODE_NOT_FOUND);
    }
}

When I send a request with wbcmd it hangs until it shows a 408 - Timeout, but if a make the tmp buffer smaller (121 or less elements) it works flawlessy.
Am I doing something wrong?

Answer 1

The Whiteboard has (to limit resource use on sensor) the maximum packet size which leads to maximum payload size. Currently the WB_MAX_MESSAGE_PAYLOAD_LENGTH is 466 bytes.

The Whiteboard limitations are defined in the file WhiteboardConfig.h

Full disclaimer: I work for the Movesense team