在 BLE 中读取和写入数据，以便快速打开/关闭 LED

Question

我正在用iOS开发BLE。我正在使用BLE服务打开/关闭LED.我能够读取数据，但无法将数据发送到BLE设备。当我发送 00 到 BLE 时， LED 应该关闭，当我发送 01 时， BLE 设备的 LED 应该打开.

这是我的代码片段。

 func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
        if let characterArray = service.characteristics as [CBCharacteristic]! {
            for cc in characterArray {
                if(cc.uuid.uuidString == "FEE1") { //properties: read, write
                                                   //if you have another BLE module, you should print or look for the characteristic you need.
                    myCharacteristic = cc //saved it to send data in another function.
                    //writeValue()
                    peripheral.readValue(for: cc) //to read the value of the characteristic
                }
            }
        }
    }
    func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
        if (characteristic.uuid.uuidString == "FEE1") {
            let readValue = characteristic.value
            print(readValue as Any)
            let value = (readValue! as NSData).bytes.bindMemory(to: Int.self, capacity: readValue!.count).pointee //used to read an Int value
            print (value)
        }
    }

    //if you want to send an string you can use this function.
    func writeValue() {
        if isMyPeripheralConected { //check if myPeripheral is connected to send data
            let dataToSend: Data = "01".data(using: String.Encoding.utf8)!
            print(dataToSend)
            myBluetoothPeripheral.writeValue(dataToSend as Data, for: myCharacteristic, type: CBCharacteristicWriteType.withoutResponse)    //Writing the data to the peripheral
        } else {
            print("Not connected")
        }
    }

我该怎么做？

Answer 1

swift 3

  var arrayReadWriteChar = [CBCharacteristic]()

    func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
        for newChar: CBCharacteristic in service.characteristics!{
            if newChar.uuid.uuidString == "FEE1"{
                self.arrayReadWriteChar.append(newChar)
                periphreal.readValue(for: newChar)
            }
        }
    }
    func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
        print("didUpdateValueForChar", characteristic)
        if let error1 = error{
            print(error1)
        }
        else{
            let value = [UInt8](characteristic.value!)
            print(value)    //whole array
            print(value[0]) //array object of index 0
        }
    }
    func writeValue(){
        if isMyPeripheralConected {
            let dataToSend: Data = "01".data(using: String.Encoding.utf8)!
            print(dataToSend)
            let command:[UInt8] = [0x01]        
            let sendData:Data = Data(command)
            myBluetoothPeripheral.writeValue(sendData, for: self.arrayReadWriteChar[0], type: .withResponse)
        } 
        else {
            print("Not connected")
        }
    }