StatusUpdateData.swift

Purpose 

StatusUpdateData.swift defines runtime tracking models used by StatusUpdateManager.swift to monitor the latest timestamps for data updates from MetaWear and Sensoria sensors in the HealthyWear iOS system.

Struct: StatusUpdateMetaWearData 

Tracks timestamps for:

Sensor Fusion (IMU & orientation)
Temperature
Ambient Light
File write operations

Properties 

var lastDataTimestampSensorFusion = [Int?](repeating: nil, count: 3)
var lastDataTimestampTemperature = [Int?](repeating: nil, count: 3)
var lastDataTimestampAmbientLight = [Int?](repeating: nil, count: 3)
var lastMetaWearWriteToFileTimestamps: Int?

Each array holds values per device index, supporting up to 3 MetaWear devices in parallel.

Method: `toJson(deviceIndex:)`

func toJson(deviceIndex: Int) -> String

Retrieves the most recent timestamps for the selected device index.
Returns a JSON string using StatusUpdateManager.serializeToJson(...).

Example Output:

{
  "lastDataTimestampSensorFusion": 1720493520000,
  "lastDataTimestampTemperature": 1720493520030,
  "lastDataTimestampAmbientLight": 1720493520065,
  "lastDataWriteToTimestamp": "1720493530000"
}

Struct: StatusUpdatSensoriaData 

Tracks:

Core sensor data timestamp (pressure + IMU)
File write timestamp

Properties 

var lastDataTimestampCore = [Int?](repeating: nil, count: 3)
var lastSensoriaWriteToFileTimestamps: Int?

Method: `toJson(deviceIndex:)`

Same JSON serialization logic tailored for Sensoria smart garments:

{
  "lastDataTimestampSensoriaCore": 1720493600000,
  "lastDataWriteTimestampSensoria": "1720493610000"
}

Integration 

These structs are consumed by:

StatusUpdateManager to serialize current device status for Flutter.
Background logic that validates whether sensors are still transmitting.
UI widgets that display “last seen” times or connection health.