WorkManager.kt

class LocationWorker(context: Context, workerParams: WorkerParameters) 
    : Worker(context, workerParams) {
    
    ...
    
    override fun doWork(): Result {
        
        val latitude = inputData.getDouble(KEY_LATITUDE, 40.1903484)
        val longitude = inputData.getDouble(KEY_LONGITUDE, 44.5148367)
        
        val sendDataService = SendDataService.getInstance()
        sendDataService.sendLocation(latitude, longitude)
            .addSuccessCallback {
                // do smth
            }
            .addFailureCallback {
                // do smth
            }

        return Result.success()
    }
}