Question

我有一个通过BLE发送以这种方式编写的消息的设备：[STX] A1 [ETX]

此设备使用C ++编写的软件，并且第三个字符是布尔值！

现在，我将使用swift通过iOS收到此消息。它可以正确接收其他传入消息，但此消息不能。

这是C ++中的一种传播方法：

isModeOn = (byte)data[1] == 1 ? true : false;

//Send message by BLE (by Serial)
Serial3.write(STX);
Serial3.write(GF);
Serial3.write(isModeOn);
Serial3.write(ETX);

这是我迅速收到的方法：

func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
    print(#function)
    var receivedMessage: String

    if characteristic.uuid == BLE_RX_UUID {

        receivedMessage = NSString(data: characteristic.value!, encoding: String.Encoding.utf8.rawValue)! as String
        processMessage(receivedMessage: "\(receivedMessage as String)")
    }
}

有人可以帮助我吗？

更新！我找到了这种方法：

//Lettura fecilitata dei NSData
struct DataReader {
    var data: Data
    var offset: Int = 0

    mutating func read() -> UInt8 {
        let result = data[offset]
        offset += MemoryLayout<UInt8>.size
        return result
    }
    mutating func read2() -> UInt16 {
        let subdata = data.subdata(in: offset..<offset+MemoryLayout<UInt16>.size)
        let result: UInt16 = subdata.withUnsafeBytes {(bytes: UnsafePointer<UInt16>) in
            bytes.pointee.littleEndian
        }
        offset += MemoryLayout<UInt16>.size
        return result
    }
}

以此我可以轻松接收我的数据

var reader = MessageHelper.DataReader.init(data: receivedMessage, offset: 0)

    for _ in 1...reader.data.count {
        let value = reader.read()

        if value == STX {
            incomingMessage = ""
        } else if value == ETX {
            print(#function, incomingMessage)
            commandSelector(message: incomingMessage)
        } else {
            if value == 0x01 {
                incomingMessage += "1"
            } else if value == 0x00 {
                incomingMessage += "0"
            } else {
                incomingMessage += "\(Character(UnicodeScalar(value)))"
            }
        }
    }

好！如果我需要发送相同的消息

sendMessage(message: String("\(COMMAND)\(Character(UnicodeScalar(UInt8(1))))"), withResponde: true)

我必须先将UnicodeScalar中的UInt8（1）转换为Character，仅此而已！

Swift通过BLE从设备接收数据

0 个答案: