Question

我知道上面提到的断开连接错误在堆栈中被问过很多次，但是接受的答案并不是实际的解决方案

我正在尝试将MI Band 3与我的快速App连接起来。它已成功连接，但一段时间后会自动断开连接

Error:  Error Domain=CBErrorDomain Code=7 "The specified device has disconnected from us." UserInfo={NSLocalizedDescription=The specified device has disconnected from us

我的应用程序要求：我需要从Apple Watch，Fitbit和MI Smart Watch获取心率和步行距离

我尝试在多个设备上连接相同的MI Band，结果相同。但是那个特定的MI乐队可以与自己的应用完美配合

--> Connect Device - Kept reference of connected Device
    func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
        print("Connected With Peripheral: \(peripheral)")
        selectedPeripheral=peripheral
        self.delegate?.scannedPeripherals(Is: peripheral)

        /// Discover Services Provided By Device
        selectedPeripheral?.delegate=self
        selectedPeripheral?.discoverServices([heartRateServiceCBUUID])
    }

---> After Discovering services With heart Rate CBUUID
func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
        guard let characteristics = service.characteristics else { return }
        selectedPeripheral=peripheral
        for char in characteristics {
            print("Characterstics: \(char)")
            if char.properties.contains(.read) {
            }
            if char.properties.contains(.notify) {
                /// ------------- Setting Notify to true but not never call required delegates ----------------
                peripheral.setNotifyValue(true, for: char)
                print("\(char.uuid): properties contains .notify")
                peripheral.readValue(for: char)
            }
        }
    }


Calculating BPM from delegate
func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
        switch characteristic.uuid {
        case bodySensorLocationCharacteristicCBUUID:
            let bodySensorLocation = bodyLocation(from: characteristic)
            print(bodySensorLocation)
        default:
            /// --------- here characteristic value is nil --------------
            let bpm = heartRate(from: characteristic)
            print("BPM: \(bpm)")
        }
    }

Answer 1

在func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?)

尝试删除peripheral.readValue(for: char)，然后再次测试！

设备断开连接一段时间后无法获得特性

1 个答案: