BLE：如何获取正确的服务UUID和特征UUID？

Question

我是蓝牙连接的新手，我想在我的 iOS 项目中添加第二个设备。我已经有一个设备，新设备与第一个非常相似，但有点不同。我有两个设备的一个进程，我没有更改很多代码，只是为新设备创建了所有值。我的所有设备都有不同的名称和标识符，第一个设备工作正常。

为了创建 UUID 值，我使用了 UUID 生成器 (https://www.guidgenerator.com/online-guid-generator.aspx)。

class BleConstants: NSObject {
let deviceTwoServiceUUID = “59DE3994-6A63-4654-8FF0-F85C5163B2F5”
let deviceTwoFirstCharacteristicUUID = “59DE3994-6A63-4654-8FF0-F85C5163B2F6”
let deviceTwoSecondCharacteristicUUID = “59DE3994-6A63-4654-8FF0-F85C5163B2F7”
let deviceOneServiceUUID = “A6AF4483-E210-457B-B9D6-B8A621513D1D”
let deviceOneFirstCharacteristicUUID = “A6AF4483-E210-457B-B9D6-B8A621513D2D”
let deviceOneSecondCharacteristicUUID = “A6AF4483-E210-457B-B9D6-B8A621513D2D”
}

class BleManager: NSObject, CBCentralManagerDelegate, CBPeripheralDelegate {
@objc private(set) static var sharedInstance = BleManager()
var cbManager : CBCentralManager? = nil
var currentPeripheral : CBPeripheral? = nil
var secondService : CBService? = nil
var firstService : CBService? = nil
var secondFirstCharacteristic : CBCharacteristic!
var secondSecondCharacteristic : CBCharacteristic!
var firstFirstCharacteristic : CBCharacteristic!
var firstSecondCharacteristic : CBCharacteristic!

func initCentralManager() {
    if cbManager == nil {
        cbManager = CBCentralManager(delegate: self, queue: nil, options: [CBCentralManagerOptionRestoreIdentifierKey : “MyApp”, CBCentralManagerOptionShowPowerAlertKey: true])            
    }

func deinitCentralManager() {
    cbManager = nil
}

func isBluetoothAvailable() -> Bool {
    return cbManager?.state == CBManagerState.poweredOn
}

func scan() {
    if (cbManager != nil && (cbManager?.isScanning)!) {
        return
    }
    
    discoveredPeripherals.removeAll()
    
    let serviceUUIDs = [CBUUID(string: BleConstants.deviceTwoServiceUUID), CBUUID(string: BleConstants.deviceOneServiceUUID)]
    
    cbManager?.scanForPeripherals(withServices: serviceUUIDs,
                                  options: [CBCentralManagerScanOptionAllowDuplicatesKey : 1])
}

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
    if(!discoveredPeripherals.contains(peripheral)) {
        discoveredPeripherals.append(peripheral)
    }
}

func stopScan() {
    if cbManager != nil && (cbManager?.isScanning)! {
        cbManager?.stopScan()
    }
}

func connect(peripheral: CBPeripheral) {
    if cbManager?.state == CBManagerState.poweredOn {
        if currentPeripheral == nil || currentPeripheral?.state != CBPeripheralState.connected {
            cbManager?.connect(peripheral, options: nil)
        } else {
            cbManager?.cancelPeripheralConnection(peripheral)
        }
    }
}

func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
Device.savePeripheralString(peripheral: peripheral.identifier.uuidString)
    AutoConnect.stop()
DeviceUpdate.updateProgress = .None
Device.isDongleConnected = true
currentPeripheral = peripheral
currentPeripheral?.delegate = self
currentPeripheral?.discoverServices(nil)
disableSleep()
}

func disableSleep() {
    UIApplication.shared.isIdleTimerDisabled = true
}

func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
 if error != nil {
        return
    }

    if let services = peripheral.services {

        for service in services {
            if service.uuid.uuidString == BleConstants.deviceTwoServiceUUID {
        Device.dongleType = port.second
                    secondService = service
                peripheral.discoverCharacteristics(nil, for: service)
        }
            if service.uuid.uuidString == BleConstants.deviceOneServiceUUID {
        Device.dongleType = port.first
                firstService = service
                peripheral.discoverCharacteristics(nil, for: service)
            } else {
                Log.bt("didDiscoverServices for peripheral not found \(peripheral.identifier.uuidString)")
            }
        }
    }
}

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

    for characteristic in service.characteristics! {
        if characteristic.uuid.uuidString == BleConstants.deviceOneFirstCharacteristicUUID {
     firstCharacteristic = characteristic
        }  
    else if characteristic.uuid.uuidString == BleConstants.deviceOneSecondCharacteristicUUID {
           firstSecondCharacteristic = characteristic
        else if characteristic.uuid.uuidString == BleConstants.deviceTwoFirstCharacteristicUUID {
            secondFirstCharacteristic = characteristic
        } else if characteristic.uuid.uuidString == BleConstants.deviceTwoSecondCharacteristicUUID {
    secondSecondCharacteristic = characteristic
        } else {
            Log.bt("didDiscoverCharacteristics not found \(characteristic.uuid.uuidString)")
        }
    }
    
    if Device.dongleType == .deviceTwo {
         openPortDeviceTwo()
    } else {
        openPortDeviceOne()
    }
}

}

来自日志的数据：

第一台设备：

isBluetoothAvailable()
扫描()
CentralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) (peripheral
CentralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber)
扫描()
CentralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) (peripheral )
停止扫描()
连接（外设：CBPeripheral）（currentPeripheral nil，currentPeripheral nil）
CentralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral
centralManager(_:didConnect:) - didConnectPeripheral FJ1478HJ-EH8J-6709-1FH0-1456HGJ0BC901 第二个设备
savedPeripheralString FJ1478HJ-EH8J-6709-1FH0-1456HGJ0BC901 第二个设备
蓝牙停止() currentPeripheral Optional()
禁用睡眠()
外围设备（_外围设备：CBPeripheral，didDiscoverServices错误：错误？）
外围设备（_:didDiscoverServices:) - 外围设备 FJ1478HJ-EH8J-6709-1FH0-1456HGJ0BC901 的 didDiscoverServices
外围设备（_:didDiscoverServices:) - didDiscoverServices for peripheral.services 可选（[, ]) [, ], peripheral.services 是可选的([, ])) service.uuid.uuidString 是 59DE3994-6A63-4654-8FF0-F85C5163B2F5，服务是 [, , ]
外设（_:didDiscoverServices:) - didDiscoverServices SecondDevice 59DE3994-6A63-4654-8FF0-F85C5163B2F5
外围设备（_:didDiscoverServices:) - 未找到外围设备的 didDiscoverServices FJ1478HJ-EH8J-6709-1FH0-1456HGJ0BC901

对于第二个设备：

isBluetoothAvailable()
扫描()
CentralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) (peripheral
扫描()
CentralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) (peripheral
CentralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber)
停止扫描()
连接（外设：CBPeripheral）currentPeripheral nil，currentPeripheral nil
CentralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral
centralManager(_:didConnect:) - didConnectPeripheral H56KIL35-7835-7JKL-2B11-HJKLIYTAA400
savedPeripheralString H56KIL35-7835-7JKL-2B11-HJKLIYTAA400
Bluetooth stop() - currentPeripheral Optional()
禁用睡眠()
外围设备（_外围设备：CBPeripheral，didDiscoverServices错误：错误？）
外围设备(_:didDiscoverServices:) - 外围设备H56KIL35-7835-7JKL-2B11-HJKLIYTAA400的didDiscoverServices
**外围设备(_:didDiscoverServices:) - didDiscoverServices for peripheral.services Optional([, ]) 服务是 [, ], peripheral.services 是可选的（[，]）） service.uuid.uuidString 是 59DE3994-6A63-4654-8FF0-F85C5163B2F5 - 与第二个设备相同，服务是 [ ]
外围设备（_:didDiscoverServices:) - didDiscoverServices ThirdDevice 59DE3994-6A63-4654-8FF0-F85C5163B2F5 - 与 secondDevice 相同
外围设备（_:didDiscoverServices:) - 未找到外围设备的 didDiscoverServices H56KIL35-7835-7JKL-2B11-HJKLIYTAA400**

根据第 16 步应用程序中连接到我的第一个服务 UUID 和第一个特征 UUID 的第二个设备的日志信息，这是错误的！

你知道吗，我创建的 UUID 是否正确？

P.S: Android 应用程序适用于两种设备。

非常感谢！

Answer 1

多个BLE设备接收相同的服务和特征UUID是完全正常的，只意味着所有设备都提供完全相同的服务。

例如：如果您有两个设备可以测量一个人的心率，例如一个智能手表，两个设备可能提供具有相同 UUID 的心率服务。

如果您想区分设备，您可以使用您在提供的日志的第 3 步中收到的 标识符。

BLE：如何获取正确的服务UUID和特征UUID？

BLE: How to get correct service UUID and characteristic UUID?

objective-c

ios

bluetooth-lowenergy

swift