＆QUOT;服务发现失败＆QUOT;从Android的蓝牙不安全RFCOMM [英] "Service discovery failed" from Android Bluetooth Insecure Rfcomm

问题描述

有谁知道如何创建在API级别2.3.3在使用任意声明的服务名称？（不是随机的或改变服务的名称，只是一个服务名2 Android设备之间的不安全RFCOMM连接我定义我自己）

Does anyone know how to create an insecure RFCOMM connection between 2 Android devices at API level 2.3.3 while using an arbitrarily declared service name? (not random or changing service name, just a service name that I define myself)

我想创建2 Android设备之间的不安全RFCOMM连接：Droid的X2和华硕变压器。我假设这两种器件都具有的功能在安卓2.3.3的水平，实际上得到使用不安全的RFCOMM的能力。

I am trying to create an insecure Rfcomm connection between 2 Android devices: Droid X2 and an Asus Transformer. I am assuming that both of these devices have functionality at the level of Android 2.3.3 to actually gain the ability to use insecure Rfcomm.

当我尝试创建蓝牙连接如<一个href="http://stackoverflow.com/questions/5308373/how-to-create-insecure-rfcomm-socket-in-android">here,用现在的公共createInsecureRfcommSocketToServiceRecord（）和listenUsingInsecureRfcommWithServiceRecord（SERVICE，UUID），​​我得到一个报道：

When I try to create the Bluetooth connection as described here, using the now public createInsecureRfcommSocketToServiceRecord() and listenUsingInsecureRfcommWithServiceRecord(SERVICE, UUID), I get a reported:

java.io.IOException: Service discovery failed
at android.bluetooth.BluetoothSocket$SdpHelper.doSdp(BluetoothSocket.java:377)
at android.bluetooth.BluetoothSocket.connect(BluetoothSocket.java:201)
at com.s4d.bluenomad.DeviceConnections$ClientThread.run(DeviceConnections.java:406)

我发现了一个<一个href="http://stackoverflow.com/questions/8282481/android-bluetooth-connection-secure-insecure">related问题如果有人创造一个正常的连接被得到这个错误，并使用反射来调用一个私有方法。不过，我不知道什么私人方法现在将对应于发起不安全连接。我试着用在相关的问题提出的解决方案，但我问的Andr​​oid配对设备这正是我需要避免。我真的需要不安全的做法。

I found a related question where someone creating a normal connection was getting this error and used reflection to invoke a private method. However, I have no idea what private method would now correspond to initiating an "insecure" connection. I tried using the solution proposed in that related question, but I am asked by Android to pair the devices which is exactly what I need to avoid. I really do need the insecure approach.

我甚至尝试了正式的组合和黑客攻击的解决方案概述<一href="http://stackoverflow.com/questions/8282481/android-bluetooth-connection-secure-insecure">here

I even tried a combination of the official and hacked solutions outlined here

创建ServerThread侦听连接

Log.i(TAG, "Constructing a ServerThread");
// Use a temporary object that is later assigned to serverSocket,
// because serverSocket is final
BluetoothServerSocket tmp = null;
try {
    // MY_UUID is the app's UUID string, also used by the client code
    tmp = btAdapter.listenUsingInsecureRfcommWithServiceRecord(SERVICE_NAME, SERVICE_UUID);
    Log.i(TAG,"Started listening on insecure RFCOMM channel for service requests for: " + SERVICE_NAME);
} catch (IOException e) { }
serverSocket = tmp;

ServerThread监听连接

BluetoothSocket socket;
while(true)
{
    try
    {
        socket = serverSocket.accept();
    }
    catch( IOException e)
    {
        break;
    }

    if( socket != null )
    {
        Log.i(TAG, "Received new socket connection requesting service: " + SERVICE_NAME);
    }
    else
    {
        Log.i(TAG, "Socket connection attempted, but socket received is NULL.");
    }
}

创建ClientThread来发起连接

Log.i(TAG, "Constructing a ClientThread");
BluetoothSocket tmp = null;
try {
    // MY_UUID is the app's UUID string, also used by the server code
    tmp = device.createInsecureRfcommSocketToServiceRecord(SERVICE_UUID);
    Log.i(TAG,"Created client socket on insecure RFCOMM channel for service requests for: " + SERVICE_NAME);
} 
catch (IOException e) 
{ 
    Log.i(TAG, "Failed to createInsecureRfcommSocket() against MAC: " + device.getAddress());
}
clientSocket = tmp;

ClientThread连接到服务器

try
{
    clientSocket.connect();
}
catch( final IOException e)
{
    DeviceConnections.this.runOnUiThread(new Runnable()
    {

        @Override
        public void run() 
        {
            console.append("Client unable to connect to service.");
            Log.i(TAG, "Client socket unable to connect() to: " + clientSocket.getRemoteDevice().getAddress());
            e.printStackTrace();
        }

    });

}

我得到的日志输出客户端套接字无法连接（）到：[MY_MAC_ADDRESS]，然后我得到的堆栈跟踪为服务发现失败异常

I do get the log output "Client socket unable to connect() to: [MY_MAC_ADDRESS]", then I get the stacktrace for the "Service discovery failed" exception.

推荐答案

它出现的问题是，之前我叫

It appears the problem was that before I called

clientSocket.connect()

我需要调用

btAdapter.cancelDiscovery()

我在文档看到了这一点，但它也被列为表演的问题 - 在我的情况看来，这实际上是功能性的问题。有一次，我添加了取消发现呼叫，插座连接马上工作。

I had seen this in documentation but it was listed as a "performance" issue - in my case it seems that this was actually a "functional" issue. Once I added the cancel discovery call, the socket connection worked immediately.

这篇关于＆QUOT;服务发现失败＆QUOT;从Android的蓝牙不安全RFCOMM的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！