BLE 特性不立即读取完整字符串

Question

我正在通过 Hm10 将数据从滑块和按钮发送到 Arduino，但问题是我的字符串被分成两部分读取，它从倒数第二个特征分成新的行字符串。

 func writeValue(data: String){
    let valueString = (data as NSString).data(using: String.Encoding.utf8.rawValue)
    print("data string is" , data)

    //change the "data" to valueString
    if let blePeripheral = blePeripheral{
        if let txCharacteristic = txCharacteristic {
            blePeripheral.writeValue(valueString!, for: txCharacteristic, type: CBCharacteristicWriteType.withResponse)
            print(valueString!)
        }
    }
}

@IBAction func switchAction(_ sender: Any) {
    if switchUI.isOn {
        print("On ")
       // writeCharacteristic(val: 1)
        writeValue(data:"tp1z  ")
    }

func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
    print("characterstic value is" , characteristic.value!)
    if characteristic == rxCharacteristic {
        if let ASCIIstring = NSString(data: characteristic.value!, encoding: String.Encoding.utf8.rawValue) {
            characteristicASCIIValue = ASCIIstring
            print("Value Recieved: \((characteristicASCIIValue as String))")

            NotificationCenter.default.post(name:NSNotification.Name(rawValue: "Notify"), object: nil)

        }
    }
}


 func updateIncomingData () {

    NotificationCenter.default.addObserver(forName: NSNotification.Name(rawValue: "Notify"), object: nil , queue: nil){
        notification in
        let appendString = "\n"
        let myFont = UIFont(name: "Helvetica Neue", size: 15.0)
        let myAttributes2 = [NSAttributedStringKey.font: myFont!, NSAttributedStringKey.foregroundColor: UIColor.red]
       let attribString = NSAttributedString(string: "[Incoming]: " + (characteristicASCIIValue as String) + appendString, attributes: myAttributes2)

        let newAsciiText = NSMutableAttributedString(attributedString: self.consoleAsciiText!)
        self.baseTextView.attributedText = NSAttributedString(string: characteristicASCIIValue as String , attributes: myAttributes2)

        newAsciiText.append(attribString)

        self.consoleAsciiText = newAsciiText
        self.baseTextView.attributedText = self.consoleAsciiText
        print("incoming")

    }
}

我无法理解为什么它会从倒数第二个字符开始破坏我的字符串。

Answer 1

所以最后，我曾经清空字符，因为它从倒数第二个字符开始破坏我的字符串，如下所示：-

writeValue(data:"tp1z  ")

对我有用。

BLE 特性不立即读取完整字符串

BLE Characteristic not reading full string at once

ios

bluetooth-lowenergy

cbperipheral

swift

hm-10