如何在 ios swift 中将值写入 BLE 设备的特性

Question

我正在开发 iOS BLE 应用来为手机充电 phone。我做了所有正确的事情来发现特征。首先扫描外围设备并连接到它。发现具有通知和无响应属性的写入的服务（FFB0）和特征（FFB1，FFB2）。

我找到了客户端特征配置描述符。我想向 PCB 发送命令以解锁充电我想将值写入 FFB2 特性，但外设没有响应。这是我的代码。

我已经搜索了与此相关的所有内容，但我没有找到任何解决方案如果有人解决了这个问题，那将对我有所帮助。

这是客户提供的文件：

每块PCB上都有一个BLE4.0蓝牙模块，每个蓝牙模块都有一个单独的12字节长的地址码，PCB数据通道，Service UUID为OxFFBO，包含两个特征值，分别为OxFFBI和OxFFB2 ,通讯数据长度为1--20字节。 OxFFB1为APP数据下载通道。OxFBB2为蓝牙上传数据通道。

上电进入idle mode，当idle mode时，两个灯会flash.it会发送一个ID码（一个字节）给phone，[=40=中的APP =] 将得到 ID 码（一个字节）。 ID码可以通过phone设置来设置。即通过ID码发送对应的解锁指令

解锁指令为0x55,0xe1,(ID0+1),time,以下为解锁指令说明：

ID0为ID码，"time"为用户解锁时间（5-120分钟），请注意是二进制转十六进制， time==05表示5分钟， time==6表示6分钟， time ==A 表示 10 分钟，依此类推。如果PCB的ID0为0xff，解锁 pcb 60min is:0x55,0xe1,0x00,0x3c; 如果PCB的ID0为0x05，解锁 PCB 10 分钟是 :0x55 , 0xe1 ,0x06 , 0x0a

当PCB上的MCU收到解锁指令后，开始open输出和计时。当计时时间结束时，系统再次进入空闲模式。待机状态下，长按按键进入关机休眠模式

串口波特率设置为9600。 APP发送给MCU的查询指令为0x55 0x01 MCU回复APP的信息格式：0x55,0x02,bat_level,xH,XL（xH XL代表电池当前电压值， xH——代表高8位，XL---代表低8位)

import CoreBluetooth

let batteryServiceCBUUID = CBUUID(string: "FFB0")
let batteryServiceRequestCBUUID = CBUUID(string: "FFB1")
let batteryServiceRequestCBUUID2 = CBUUID(string: "FFB2")

 class ChargingViewController: UIViewController , CBPeripheralDelegate 
 ,CBCentralManagerDelegate {    

  override func viewDidLoad() {
    super.viewDidLoad()
 centralManager = CBCentralManager(delegate: self, queue: nil, options: nil)  
 }
 func centralManagerDidUpdateState(_ central: CBCentralManager) {

    switch central.state {
    case .unknown:
        print("central.state is .unknown")
    case .resetting:
        print("central.state is .resetting")
    case .unsupported:
        print("central.state is .unsupported")
    case .unauthorised:
        print("central.state is .unauthorised")
    case .poweredOff:
        print("central.state is .poweredOff")
    case .poweredOn:


        centralManager.scanForPeripherals(withServices: [batteryServiceCBUUID])

        print("central.state is .poweredOn")
    @unknown default:
        fatalError()
    }

    print("state: \(central.state)")

 }
 func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, 
 advertisementData: [String : Any], rssi RSSI: NSNumber) {

    print(peripheral)
    batteryServicePeripheral = peripheral
    batteryServicePeripheral.delegate = self
    centralManager.stopScan()
    centralManager.connect(batteryServicePeripheral)

 }
  func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {

    print("Connected=======>\(String(describing: batteryServicePeripheral))")
    batteryServicePeripheral.delegate = self
    batteryServicePeripheral.discoverServices([batteryServiceCBUUID])

}

func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, 
 error: Error?) {

    print("Fail To Connect=======>\(String(describing: error))")
}


func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: 
CBPeripheral, error: Error?) {

    if error == nil {

        print("Disconnected========>\(peripheral)")
    }else {

        print("Disconnected========>\(String(describing: error))")
    }
 }
// MARK: -  CBPeripheral Delegate Methods

func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {

    guard let services = peripheral.services else { return }

    for service in services {

        print("SPAKA:PERIPHERALSERVICES============>\(service)")
        peripheral.discoverCharacteristics(nil, for: service)

    }

}

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

    if let characteristics = service.characteristics {
        //else { return }

        for characteristic in characteristics {

            print(characteristic)


            if characteristic.uuid == batteryServiceCBUUID {

               peripheral.setNotifyValue(true, for: characteristic)

            }

            if characteristic.uuid == batteryServiceRequestCBUUID2 {

                batteryCharacteristics = characteristic


                let str1 = "55e100"
                let data = String(format: "%@%@",str1,hexTimeForChar)

                guard let valueString = data.data(using: String.Encoding.utf8)  else 
    {return}



                peripheral.writeValue(valueString, for: characteristic , type: 
        CBCharacteristicWriteType.withoutResponse)
                print("Value String===>\(valueString.debugDescription)")
                peripheral.setNotifyValue(true, for: characteristic)

            }

        }
    }
    peripheral.discoverDescriptors(for: batteryCharacteristics)
}


func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) {

    if error == nil {
        print("Message sent=======>\(String(describing: characteristic.value))")
    }else{

        print("Message Not sent=======>\(String(describing: error))")
    }




}

func peripheral(_ peripheral: CBPeripheral, didUpdateNotificationStateFor characteristic: 
CBCharacteristic, error: Error?) {

    if error == nil {
        print("SPAKA : IS NOTIFYING UPDATED STATE ======>\(characteristic.isNotifying)")
        print("SPAKA : UPDATED DESCRIPTION ======>\(String(describing: 
 characteristic.description))")


    }else{
        print("SPAKA : ERRORUPDATEDNOTIFICATION\(String(describing: error))")
    }


}


func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {

    print("SPAKA: UPDATED VALUE RECEIVED========>\(String(describing: characteristic.value))")
    print("characteristic UUID: \(characteristic.uuid), value: \(characteristic.value)")

    guard let str = characteristic.value else { return  }

    if let string = String(bytes: str, encoding: .utf8) {
        print("SPAKA==========>:::\(string)")
    } else {
        print("not a valid UTF-8 sequence")
    }



}

func peripheral(_ peripheral: CBPeripheral, didDiscoverDescriptorsFor characteristic: CBCharacteristic, error: Error?) {

    guard let desc = batteryCharacteristics.descriptors else { return }


    for des in desc {

        print("BEGIN:SPAKA DESCRIPTOR========>\(des)")
        discoveredDescriptor = des

        print("Descriptor Present Value and uuid: \(des.uuid), value: \(String(describing: des.value))")
        peripheral.readValue(for: discoveredDescriptor)


    }


}

func peripheral(_ peripheral: CBPeripheral, didWriteValueFor descriptor: CBDescriptor, error: Error?) {
    if let error = error {
        print("Failed… error: \(error)")
        return
    }

    print("Descriptor Write Value uuid: \(descriptor.uuid), value: \(String(describing: descriptor.value))")
}

func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor descriptor: CBDescriptor, error: Error?) {

    if let error = error {
        print("Failed… error: \(error)")
        return
    }

    print("Descriptor Updated Value uuid: \(descriptor.uuid), value: \(String(describing: descriptor.value))")

}
}

Answer 1

关于PDB的信息有点难以破译，但包含了很好的信息。听起来好像 PCB 包含蓝牙到 UART 模块。一种特性是向PCB发送数据，一种特性是从PCB接收数据。

需要发给PCB的命令我还是不明白。如果您可以访问 Android 代码，那么您可以在那里找到答案。

以下是可能的最小代码：

let batteryServiceUUID = CBUUID(string: "FFB0")
let rxCharacteristicUUID = CBUUID(string: "FFB1")
let txCharacteristicUUID = CBUUID(string: "FFB2")

var centralManager: CBCentralManager!
var batteryPeripheral: CBPeripheral? = nil
var batteryService: CBService? = nil
var txCharacteristic: CBCharacteristic? = nil
var rxCharacteristic: CBCharacteristic? = nil

func centralManagerDidUpdateState(_ central: CBCentralManager) {
    if central.state == .poweredOn {
        centralManager.scanForPeripherals(withServices: [batteryServiceUUID])
    }
}

func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
    batteryPeripheral = peripheral
    batteryPeripheral!.delegate = self
    centralManager.stopScan()
    centralManager.connect(batteryPeripheral!)
}

func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
    batteryPeripheral!.discoverServices([batteryServiceUUID])
}

func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
    peripheral.discoverCharacteristics(nil, for: peripheral.services![0])
}

func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
    for characteristic in service.characteristics! {
        if characteristic.uuid == rxCharacteristicUUID {
            rxCharacteristic = characteristic
            peripheral.setNotifyValue(true, for: rxCharacteristic!)
        } else if (characteristic.uuid == txCharacteristicUUID) {
            txCharacteristic = characteristic
        }
    }
    sendInitialCommand()
}

func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
    if let value = characteristic.value {
        print("Data received")
        print(value as NSData)
    }
}

func sendInitialCommand() {
    let cmdBytes: [UInt8] = [0x55, 0xe1, 0x00, 0x0a]
    let cmd = Data(cmdBytes)
    batteryPeripheral!.writeValue(cmd, for: txCharacteristic!, type: .withoutResponse)
}

如何在 ios swift 中将值写入 BLE 设备的特性

How to write a value to characteristc for BLE Device in ios swift

characteristics

ios

core-bluetooth

cbperipheral

swift