Arduino蓝牙通信问题答案

【问题标题】：Arduino Bluetooth communication issuesArduino蓝牙通信问题
【发布时间】：2018-11-02 17:30:55
【问题描述】：

基于 SDK 的蓝牙聊天示例，我正在开发一个在 android 设备和 arduino 之间传输字符串的应用程序。我有以下问题：

1- 如果我使用此代码，我会丢失 arduino 发送的第一个字节：

      // Keep listening to the InputStream while connected
        while (true) {
            try { 
                bytes = mmInStream.read(buffer);
                // Send the obtained bytes to the UI Activity
                mHandler.obtainMessage(MESSAGE_READ, bytes,-1, buffer).sendToTarget();

但是这样就可以了：

          bytes = mmInStream.available();
            if(bytes != 0) {
               SystemClock.sleep(100); //pause and wait for rest of data. 
               bytes = mmInStream.available(); // how many bytes are ready to be read?
               bytes = mmInStream.read(buffer, 0, bytes); // record how many bytes we actually read
               // Send the obtained bytes to the UI activity
               mHandler.obtainMessage(MESSAGE_READ, bytes, -1, buffer).sendToTarget(); 
             }

请解释一下？

2- Arduino 在从设备接收到字符串时发送字符串“OK”。如何在我的应用中将其用作 ACK(nowledgement)？

我试过了，但没有成功：

  String ack = ""; //global variable

   sendstring("test string");// send a test string to arduino
   SystemClock.sleep(100); //wait for arduino response
   if(ack.equals("OK")) txtv.setText(" well received"); //well done

在处理程序中：

  if(msg.what == Bluetooth.MESSAGE_READ){
 String receivedstring = new String((byte[]) msg.obj, 0, msg.arg1);
 ack = receivedstring ;

我没有得到 ack = "OK" ，并且 "well received" 没有显示在文本视图中！！

非常感谢您的帮助

【问题讨论】：

标签： android bluetooth arduino

【解决方案1】：

您好，我对 blutoothchat 了解不多，但我可能对您的第一个问题有所了解。如果你还没有答案。

    // Keep listening to the InputStream while connected
    while (true) {
    try { 
    bytes = mmInStream.read(buffer); // it may not work because its not reading from the first line unlike this: bytes = mmInStream.read(buffer, 0, bytes);
    // Send the obtained bytes to the UI Activity
    mHandler.obtainMessage(MESSAGE_READ, bytes,-1, buffer).sendToTarget();

【讨论】：