Bluetooth measure takes many samples and writes in invalid JSON format

[koenniem]

Device / Emulator and OS

Please complete the following information for each phone and/or emulator you're experiencing this bug on:

• Device: Xiaomi Mi 10T Lite and Samsung S20 FE
• OS: Android 12

Describe the bug

When using the Bluetooth measure in carp_connectivity_package, the output are cumulative intermediate measurements instead of only the final result. In other words, instead of waiting for results, multiple measurements appear in the output with an increasing number of devices found in the Bluetooth scan. Concretely, the first result is likely to contain no found Bluetooth devices in the vicinity, the second measurement a few, in the third measurement, a few more, et cetera. The total number of measurement on my phone was 12 instead of just 1.

Additionally, in the case of using a FileDataEndPoint, the measurements appear in invalid JSON format (see attachment).

To Reproduce

1. Download the example app in apps/carp_mobile_sensing_app
2. In pubspec.yaml change research_package to research_package: ^1.2.0 (otherwise pub get doesn't work)
3. Do pub get
4. Go to getStudyProtocol in Sensing/local_study_protocol_mananger.dart
   Replace everything after protocol.addMasterDevice(phone); with the following code (to focus on one sensor):

    Measure bluetoothMeasure = Measure(type: ConnectivitySamplingPackage.BLUETOOTH);
    bluetoothMeasure.overrideSamplingConfiguration = PeriodicSamplingConfiguration(
      interval: const Duration(seconds: 20),
      duration: const Duration(seconds: 5),
    );

    protocol.addTriggeredTask(
        ImmediateTrigger(),
        BackgroundTask()
          ..addMeasure(bluetoothMeasure),
        phone);

    return protocol;

5. Run the app
6. After 20 seconds, the number of samples will appear on-screen and in the terminal.
   I then get the following output after a couple of minutes:

Expected behavior

A properly formatted JSON file with exactly one Bluetooth measurement.

Actual behavior

Output

[
{"carp_header":{"study_id":"9498b4f0-69bb-11ed-b196-6fe3b5cd024f","device_role_name":"masterphone","trigger_id":"0","user_id":"94bc1b70-69bb-11ed-be10-eb304a0ea062","start_time":"2022-11-23T13:07:34.882635Z","data_format":{"namespace":"dk.cachet.carp","name":"bluetooth"}},"carp_body":{"id":"cc03cef0-6b2f-11ed-8503-c9d2f73b762a","timestamp":"2022-11-23T13:07:34.879608Z","scan_result":[]}}{"carp_header":{"study_id":"9498b4f0-69bb-11ed-b196-6fe3b5cd024f","device_role_name":"masterphone","trigger_id":"0","user_id":"94bc1b70-69bb-11ed-be10-eb304a0ea062","start_time":"2022-11-23T13:07:34.895827Z","data_format":{"namespace":"dk.cachet.carp","name":"bluetooth"}},"carp_body":{"id":"cc041d10-6b2f-11ed-9862-554bf89cf15e","timestamp":"2022-11-23T13:07:34.881143Z","scan_result":[]}}
,

,
{"carp_header":{"study_id":"9498b4f0-69bb-11ed-b196-6fe3b5cd024f","device_role_name":"masterphone","trigger_id":"0","user_id":"94bc1b70-69bb-11ed-be10-eb304a0ea062","start_time":"2022-11-23T13:07:35.073206Z","data_format":{"namespace":"dk.cachet.carp","name":"bluetooth"}},"carp_body":{"id":"cc214200-6b2f-11ed-a9be-9145482eb747","timestamp":"2022-11-23T13:07:35.072020Z","scan_result":[{"advertisement_name":"","bluetooth_device_id":"17:D8:C8:11:C2:A6","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-82}]}}{"carp_header":{"study_id":"9498b4f0-69bb-11ed-b196-6fe3b5cd024f","device_role_name":"masterphone","trigger_id":"0","user_id":"94bc1b70-69bb-11ed-be10-eb304a0ea062","start_time":"2022-11-23T13:07:35.078492Z","data_format":{"namespace":"dk.cachet.carp","name":"bluetooth"}},"carp_body":{"id":"cc222c60-6b2f-11ed-8223-0dba721fdd3a","timestamp":"2022-11-23T13:07:35.078175Z","scan_result":[{"advertisement_name":"","bluetooth_device_id":"17:D8:C8:11:C2:A6","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-82},{"advertisement_name":"","bluetooth_device_id":"64:F7:12:93:4C:30","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-43}]}}{"carp_header":{"study_id":"9498b4f0-69bb-11ed-b196-6fe3b5cd024f","device_role_name":"masterphone","trigger_id":"0","user_id":"94bc1b70-69bb-11ed-be10-eb304a0ea062","start_time":"2022-11-23T13:07:35.081574Z","data_format":{"namespace":"dk.cachet.carp","name":"bluetooth"}},"carp_body":{"id":"cc22a190-6b2f-11ed-98cf-71ef64eca64a","timestamp":"2022-11-23T13:07:35.081305Z","scan_result":[{"advertisement_name":"","bluetooth_device_id":"17:D8:C8:11:C2:A6","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-82},{"advertisement_name":"","bluetooth_device_id":"64:F7:12:93:4C:30","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-43},{"advertisement_name":"","bluetooth_device_id":"30:67:8A:65:69:8C","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-46}]}}{"carp_header":{"study_id":"9498b4f0-69bb-11ed-b196-6fe3b5cd024f","device_role_name":"masterphone","trigger_id":"0","user_id":"94bc1b70-69bb-11ed-be10-eb304a0ea062","start_time":"2022-11-23T13:07:35.087396Z","data_format":{"namespace":"dk.cachet.carp","name":"bluetooth"}},"carp_body":{"id":"cc238bf0-6b2f-11ed-9964-a96ba5434091","timestamp":"2022-11-23T13:07:35.086825Z","scan_result":[{"advertisement_name":"","bluetooth_device_id":"17:D8:C8:11:C2:A6","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-82},{"advertisement_name":"","bluetooth_device_id":"64:F7:12:93:4C:30","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-43},{"advertisement_name":"","bluetooth_device_id":"30:67:8A:65:69:8C","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-46},{"advertisement_name":"","bluetooth_device_id":"33:1B:BD:D6:B9:F7","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-91}]}}{"carp_header":{"study_id":"9498b4f0-69bb-11ed-b196-6fe3b5cd024f","device_role_name":"masterphone","trigger_id":"0","user_id":"94bc1b70-69bb-11ed-be10-eb304a0ea062","start_time":"2022-11-23T13:07:35.091241Z","data_format":{"namespace":"dk.cachet.carp","name":"bluetooth"}},"carp_body":{"id":"cc242830-6b2f-11ed-998e-695bb6a6d872","timestamp":"2022-11-23T13:07:35.090956Z","scan_result":[{"advertisement_name":"","bluetooth_device_id":"17:D8:C8:11:C2:A6","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-82},{"advertisement_name":"","bluetooth_device_id":"64:F7:12:93:4C:30","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-43},{"advertisement_name":"","bluetooth_device_id":"30:67:8A:65:69:8C","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-46},{"advertisement_name":"","bluetooth_device_id":"33:1B:BD:D6:B9:F7","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-91},{"advertisement_name":"","bluetooth_device_id":"20:90:37:52:A5:AD","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-70}]}}{"carp_header":{"study_id":"9498b4f0-69bb-11ed-b196-6fe3b5cd024f","device_role_name":"masterphone","trigger_id":"0","user_id":"94bc1b70-69bb-11ed-be10-eb304a0ea062","start_time":"2022-11-23T13:07:35.095525Z","data_format":{"namespace":"dk.cachet.carp","name":"bluetooth"}},"carp_body":{"id":"cc24c470-6b2f-11ed-bb8d-57f5cc5b1a36","timestamp":"2022-11-23T13:07:35.095259Z","scan_result":[{"advertisement_name":"","bluetooth_device_id":"17:D8:C8:11:C2:A6","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-82},{"advertisement_name":"","bluetooth_device_id":"64:F7:12:93:4C:30","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-43},{"advertisement_name":"","bluetooth_device_id":"30:67:8A:65:69:8C","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-46},{"advertisement_name":"","bluetooth_device_id":"33:1B:BD:D6:B9:F7","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-91},{"advertisement_name":"","bluetooth_device_id":"20:90:37:52:A5:AD","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-70},{"advertisement_name":"","bluetooth_device_id":"70:06:BA:EC:A1:32","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-81}]}}{"carp_header":{"study_id":"9498b4f0-69bb-11ed-b196-6fe3b5cd024f","device_role_name":"masterphone","trigger_id":"0","user_id":"94bc1b70-69bb-11ed-be10-eb304a0ea062","start_time":"2022-11-23T13:07:35.101354Z","data_format":{"namespace":"dk.cachet.carp","name":"bluetooth"}},"carp_body":{"id":"cc25aed0-6b2f-11ed-9b77-df91374205b1","timestamp":"2022-11-23T13:07:35.101119Z","scan_result":[{"advertisement_name":"","bluetooth_device_id":"17:D8:C8:11:C2:A6","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-82},{"advertisement_name":"","bluetooth_device_id":"64:F7:12:93:4C:30","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-43},{"advertisement_name":"","bluetooth_device_id":"30:67:8A:65:69:8C","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-46},{"advertisement_name":"","bluetooth_device_id":"33:1B:BD:D6:B9:F7","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-91},{"advertisement_name":"","bluetooth_device_id":"20:90:37:52:A5:AD","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-70},{"advertisement_name":"","bluetooth_device_id":"70:06:BA:EC:A1:32","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-81},{"advertisement_name":"","bluetooth_device_id":"3B:F9:4A:83:E6:AF","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-86}]}}{"carp_header":{"study_id":"9498b4f0-69bb-11ed-b196-6fe3b5cd024f","device_role_name":"masterphone","trigger_id":"0","user_id":"94bc1b70-69bb-11ed-be10-eb304a0ea062","start_time":"2022-11-23T13:07:35.104586Z","data_format":{"namespace":"dk.cachet.carp","name":"bluetooth"}},"carp_body":{"id":"cc262400-6b2f-11ed-853b-ef9c42b95104","timestamp":"2022-11-23T13:07:35.104309Z","scan_result":[{"advertisement_name":"","bluetooth_device_id":"17:D8:C8:11:C2:A6","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-82},{"advertisement_name":"","bluetooth_device_id":"64:F7:12:93:4C:30","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-43},{"advertisement_name":"","bluetooth_device_id":"30:67:8A:65:69:8C","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-46},{"advertisement_name":"","bluetooth_device_id":"33:1B:BD:D6:B9:F7","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-91},{"advertisement_name":"","bluetooth_device_id":"20:90:37:52:A5:AD","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-70},{"advertisement_name":"","bluetooth_device_id":"70:06:BA:EC:A1:32","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-81},{"advertisement_name":"","bluetooth_device_id":"3B:F9:4A:83:E6:AF","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-86},{"advertisement_name":"","bluetooth_device_id":"07:DC:E1:A3:FB:26","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-91}]}}
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{"carp_header":{"study_id":"9498b4f0-69bb-11ed-b196-6fe3b5cd024f","device_role_name":"masterphone","trigger_id":"0","user_id":"94bc1b70-69bb-11ed-be10-eb304a0ea062","start_time":"2022-11-23T13:07:36.228051Z","data_format":{"namespace":"dk.cachet.carp","name":"bluetooth"}},"carp_body":{"id":"ccd17f30-6b2f-11ed-92f6-b7b5c573ff03","timestamp":"2022-11-23T13:07:36.227653Z","scan_result":[{"advertisement_name":"","bluetooth_device_id":"17:D8:C8:11:C2:A6","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-82},{"advertisement_name":"","bluetooth_device_id":"64:F7:12:93:4C:30","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-43},{"advertisement_name":"","bluetooth_device_id":"30:67:8A:65:69:8C","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-46},{"advertisement_name":"","bluetooth_device_id":"33:1B:BD:D6:B9:F7","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-91},{"advertisement_name":"","bluetooth_device_id":"20:90:37:52:A5:AD","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-70},{"advertisement_name":"","bluetooth_device_id":"70:06:BA:EC:A1:32","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-81},{"advertisement_name":"","bluetooth_device_id":"3B:F9:4A:83:E6:AF","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-86},{"advertisement_name":"","bluetooth_device_id":"07:DC:E1:A3:FB:26","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":false,"rssi":-91},{"advertisement_name":"","bluetooth_device_id":"5E:32:A5:A1:9C:F3","bluetooth_device_name":"","bluetooth_device_type":"unknown","connectable":true,"rssi":-74}]}}
,

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[bardram]

You're right. Looking at this now.

[bardram]

Released as version 0.40.1 of the carp_connectivity_package package.