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Add initial blood pressure cuff implementation
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| Original file line number | Diff line number | Diff line change |
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| // | ||
| // This source file is part of the ENGAGE-HF project based on the Stanford Spezi Template Application project | ||
| // | ||
| // SPDX-FileCopyrightText: 2024 Stanford University | ||
| // | ||
| // SPDX-License-Identifier: MIT | ||
| // | ||
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| import BluetoothServices | ||
| import Foundation | ||
| import OSLog | ||
| import SpeziBluetooth | ||
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| class BloodPressureCuffDevice: BluetoothDevice, Identifiable { | ||
| private static let logger = Logger(subsystem: "ENGAGEHF", category: "BloodPressureCuffDevice") | ||
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| @DeviceState(\.id) var id: UUID | ||
| @DeviceState(\.name) var name: String? | ||
| @DeviceState(\.state) var state: PeripheralState | ||
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| @Service var deviceInformation = DeviceInformationService() | ||
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| @Service var time = CurrentTimeService() | ||
| @Service var bloodPressure = BloodPressureService() | ||
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| @DeviceAction(\.connect) var connect | ||
| @DeviceAction(\.disconnect) var disconnect | ||
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| // TODO: user data service? | ||
| // TODO: record access service! | ||
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| required init() { | ||
| $state | ||
| .onChange(perform: handleStateChange) | ||
| bloodPressure.$bloodPressureMeasurement | ||
| .onChange(perform: processMeasurement) | ||
| } | ||
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| private func handleStateChange(_ state: PeripheralState) { | ||
| guard case .connected = state else { | ||
| return | ||
| } | ||
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| time.ensureUpdatedTime() | ||
| } | ||
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| private func processMeasurement(_ measurement: BloodPressureMeasurement) { | ||
| // TODO: actually do something with it | ||
| print("Received new measurement: \(measurement)") | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,44 @@ | ||
| // | ||
| // This source file is part of the ENGAGE-HF project based on the Stanford Spezi Template Application project | ||
| // | ||
| // SPDX-FileCopyrightText: 2024 Stanford University | ||
| // | ||
| // SPDX-License-Identifier: MIT | ||
| // | ||
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| import BluetoothServices | ||
| import Foundation | ||
| import OSLog | ||
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| extension CurrentTimeService { | ||
| private static var logger: Logger { // TODO: how to deal with that? | ||
| Logger(subsystem: "edu.stanford.bluetooth", category: "CurrentTimeService") | ||
| } | ||
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| // TODO: consider moving to SpeziBluetooth! | ||
| func ensureUpdatedTime() { // TODO: better name? | ||
| // check if time update is necessary | ||
| if let currentTime = currentTime, | ||
| let deviceTime = currentTime.time.date { | ||
| // TODO: what are the default (empty values)? is this check sufficient? (check for zero year, month, day?) | ||
| let difference = abs(deviceTime.timeIntervalSinceReferenceDate - Date.now.timeIntervalSinceReferenceDate) | ||
| if difference < 5 { | ||
| // TODO: better value? | ||
| return // we consider 5 second difference accurate enough?) | ||
| } | ||
| } | ||
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| // update time if it isn't present or if it is outdated | ||
| Task { | ||
| let exactTime = ExactTime256(from: .now) | ||
| do { | ||
| try await $currentTime.write(CurrentTime(time: exactTime)) | ||
| Self.logger.debug("Updated weight scale device time to \(String(describing: exactTime))") | ||
| } catch { | ||
| Self.logger.warning("Failed to update current time: \(error)") | ||
| } | ||
| } | ||
| } | ||
| } | ||
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