Hi there. We are trying to implement SensorKit into our App to explore the data quality of accelerometer data recorded even when the App is terminated. So far we managed everything to work, even the fetch, except the SRSensorReaderDelegate never seems to reach func sensorReader(_ reader: SRSensorReader, fetching fetchRequest: SRFetchRequest, didFetchResult result: SRFetchResult) -> Bool { ... } Any clue as to what we need to adjust in our code to get the FetchResult? import Foundation import SensorKit import CoreMotion import os.log class SensorKitDataManager: NSObject, SRSensorReaderDelegate { static let shared = SensorKitDataManager() // Sensor Readers let accelerometerReader = SRSensorReader(sensor: .accelerometer) let rotationRateReader = SRSensorReader(sensor: .rotationRate) let deviceUsageReader = SRSensorReader(sensor: .deviceUsageReport) let phoneUsageReader = SRSensorReader(sensor: .phoneUsageReport) let wristUsageReader = SRSensorReader(sensor: .onWristState) var startTime: CFTimeInterval = CFTimeInterval(Date().timeIntervalSince1970) var endTime: CFTimeInterval = CFTimeInterval(Date().timeIntervalSince1970) override init() { super.init() configureSensorReaders() } // Configure sensor readers and set delegate private func configureSensorReaders() { if SRSensorReader(sensor: .accelerometer).authorizationStatus == .authorized { accelerometerReader.delegate = self } ... } func sensorReaderWillStartRecording(_ reader: SRSensorReader) { print("\(reader.description) Delegate starts recording") } func sensorReader(_ reader: SRSensorReader, startRecordingFailedWithError error: Error) { print("\(reader.description) Delegate failed recording") } func sensorReader(_ reader: SRSensorReader, didChange authorizationStatus: SRAuthorizationStatus) { if reader.sensor == .accelerometer { if authorizationStatus == SRAuthorizationStatus.authorized { accelerometerReader.startRecording() } else if authorizationStatus == SRAuthorizationStatus.denied { accelerometerReader.stopRecording() } } ... } // Request SensorKit Authorization func requestAuthorization() { } if UserDefaults.standard.bool(forKey: "JTrack_accelerometerEnabled") && accelerometerReader.authorizationStatus == .notDetermined { SRSensorReader.requestAuthorization(sensors: [.accelerometer]) { error in if let error = error { os_log("Authorization denied: %@", log: OSLog.default, type: .error, error.localizedDescription) } else { os_log("Authorization granted for accelerometer sensor", log: OSLog.default, type: .info) } } } ... self.startRecordingIfAuthorized() } // Start recording for each authorized sensor private func startRecordingIfAuthorized() { if accelerometerReader.authorizationStatus == .authorized { accelerometerReader.startRecording() } ... } func fetchAllDataSinceJoined(from startTime: CFTimeInterval, to endTime: CFTimeInterval) { self.startTime = startTime self.endTime = endTime if accelerometerReader.authorizationStatus == .authorized { accelerometerReader.fetchDevices() } .... } func stopAllRecordings() { if accelerometerReader.authorizationStatus == .authorized { accelerometerReader.stopRecording() } ... } func sensorReader(_ reader: SRSensorReader, didFetch devices: [SRDevice]) { let now = CFTimeInterval(Date().timeIntervalSince1970) // Ensure the data is at least 24 hours old let holdingPeriod: CFTimeInterval = 24 * 60 * 60 // 24 hours in seconds let earliestFetchTime = now - holdingPeriod // Adjust the start time if it's within the holding period let adjustedStartTime = min(startTime, earliestFetchTime) // If adjustedStartTime is after endTime, no data is available for fetching guard adjustedStartTime < endTime else { print("No data available to fetch as it falls within the 24-hour holding period.") return } let fetchRequest = SRFetchRequest() fetchRequest.from = SRAbsoluteTime(adjustedStartTime) fetchRequest.to = SRAbsoluteTime(endTime) // Log information about the devices that contributed data for device in devices { print("Device model: \(device.model), OS version: \(device.systemVersion), Identifier: \(device.description)") if device.model == "iPhone" { fetchRequest.device = device } } if accelerometerReader.authorizationStatus == .authorized { accelerometerReader.fetch(fetchRequest) } ... } // SensorKit Delegate Methods func sensorReader(_ reader: SRSensorReader, didCompleteFetch fetchRequest: SRFetchRequest) { os_log("Fetch completed for sensor: %@", log: OSLog.default, type: .info, reader.sensor.rawValue) } func sensorReader(_ reader: SRSensorReader, fetching fetchRequest: SRFetchRequest, didFetchResult result: SRFetchResult<AnyObject>) -> Bool { if reader.sensor == .accelerometer { .... } .... } func sensorReaderDidStopRecording(_ reader: SRSensorReader) { print("\(reader.description) Delegate stops recording") } func sensorReader(_ reader: SRSensorReader, stopRecordingFailedWithError error: Error) { print("\(reader.description) Delegate failed stopping") }