Data Streams

Collected data is streamed back to a CARP Web Service using the Data subsystem. This is done using the CarpDataStreamService like this:

// Configure a [CarpDataStreamService] from an existing CAWS service.
CarpDataStreamService().configureFrom(CarpService());

// Create a (very simple) data batch with one measurement to upload
var measurement = Measurement(
  sensorStartTime: 1642505144000000,
  data: Geolocation(
      latitude: 55.680802203873114, longitude: 12.581802212861367));

var batch = [
  DataStreamBatch(
    dataStream: DataStreamId(
        studyDeploymentId:
            CarpDataStreamService().app.studyDeploymentId ?? '',
        deviceRoleName: 'smartphone',
        dataType: Geolocation.dataType),
    firstSequenceId: 0,
    measurements: [measurement],
    triggerIds: {0}),
];

// Get a data stream and append the batch
CarpDataStreamService().dataStream(studyDeploymentId).append(batch);

However, you would rarely need to use these endpoints in your app, since the carp_backend would handle this when you use a CarpDataEndPoint as the data endpoint in the study protocol.