使用Xamarin的Visual Studio(C#)中的OBD II应用程序
我正在开发一款从OBD II蓝牙适配器接收数据的Android应用程序。 设置应用程序和适配器之间的连接工作,但是当我发送命令到适配器我不会得到正确的结果。 它要么返回:
+连接<
或我刚刚发送给适配器的命令。
该应用程序在Visual Studio中使用Xamarin进行编码以针对Android进行开发。 该代码仅显示应用程序的简化版本,只是在01-1f之间发布支持的PID的代码。
BluetoothAdapter myAdapter;
BluetoothSocket socket = null;
string rawData;
public BluetoothConnect()
{
myAdapter = BluetoothAdapter.DefaultAdapter;
if (myAdapter == null)
{
//Device has no Bluetooth
}
if (!myAdapter.IsEnabled)
{
myAdapter.Enable();
}
BluetoothDevice d = myAdapter.GetRemoteDevice("AA:BB:CC:11:22:33");
socket = d.CreateRfcommSocketToServiceRecord(UUID.FromString("00001101-0000-1000-8000-00805F9B34FB"));
socket.Connect();
byte[] cmd = Encoding.ASCII.GetBytes("AT D");
socket.OutputStream.Write(cmd, 0, cmd.Length);
ReadAnswer();
socket.OutputStream.Flush();
cmd = Encoding.ASCII.GetBytes("AT Z");
socket.OutputStream.Write(cmd, 0, cmd.Length);
socket.OutputStream.Flush();
cmd = Encoding.ASCII.GetBytes("AT E0");
socket.OutputStream.Write(cmd, 0, cmd.Length);
ReadAnswer();
socket.OutputStream.Flush();
cmd = Encoding.ASCII.GetBytes("AT L0");
socket.OutputStream.Write(cmd, 0, cmd.Length);
ReadAnswer();
socket.OutputStream.Flush();
cmd = Encoding.ASCII.GetBytes("AT S0");
socket.OutputStream.Write(cmd, 0, cmd.Length);
ReadAnswer();
socket.OutputStream.Flush();
cmd = Encoding.ASCII.GetBytes("AT H0");
socket.OutputStream.Write(cmd, 0, cmd.Length);
ReadAnswer();
socket.OutputStream.Flush();
cmd = Encoding.ASCII.GetBytes("AT SP 0");
socket.OutputStream.Write(cmd, 0, cmd.Length);
ReadAnswer();
socket.OutputStream.Flush();
cmd = Encoding.ASCII.GetBytes("0100");
socket.OutputStream.Write(cmd, 0, cmd.Length);
ReadAnswer();
}
private void ReadAnswer() {
try {
rawData = "";
int a = 0;
System.Text.StringBuilder b = new System.Text.StringBuilder();
char c;
while (((a = (byte)socket.InputStream.ReadByte()) > -1))
{
c = (char)a;
if (c == '>')
{
break;
}
b.Append(c);
}
rawData = b.ToString();
Log.Info("-----------------------------------", "RawData: " + rawData);
socket.InputStream.Flush();
}
catch(System.Exception e)
{
Log.Info("", "" + e.Message);
}
}
我已经尝试了初始化命令的不同组合。
我可以想象,这个问题必须通过阅读输入流或发送命令的方法来完成,但我不知道该怎么做,因为我是Visual Studio,Xamarin和Android开发人员的新手。
希望你们能给我一些建议!
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