[android-developers] Re: Concurrent 3G and WiFi : Socket creation problem

Glex,

   I've been following your work and I am trying to do something similar, but instead of using wifi/rmnet0 I am looking to use USB/Ethernet and rmnet0 simultaneously. My work isn't using stock AOSP I've been pretty much working with CM 10.1 and so far my USB/Ethernet connection is successful and rmnet0 works as it always did, but trying to combine the two (basically making the phone a router) the USB/Ethernet interface takes priority and shuts down the rmnet0. Do you have any suggestions? I'm digging through the CM 10.1 kernel to maybe find a work around/patch, but I'm up for any alternatives.

~Ty

On Sunday, September 16, 2012 7:17:46 PM UTC-4, glex wrote:

The problem has been solved.

I updated my routing table for appropriate source routing and two default gateways (for different source IP addresses)

Thanks,

GLEX

On Wednesday, 29 August 2012 13:09:29 UTC-4, glex wrote:

I am aware that concurrent usage of WiFi and 3G/4G is not supported on Android devices right now. I am working on a research project which tries to analyse the pros and cons for the same.

I used the approach used by Android WiFi tether to reload the WiFi driver and configure the routing table and appropriate interfaces. I summarized my work in the followinglink. I tested my setup using the "ping -I eth0/rmnet0 <web server>".  Till this phase everything is running smoothly. 

As a next step I tried to establish a socket connection using the two interfaces. Everything works fine as I use 3G interface, but when I try using the WiFi (eth0), socket connection is not successful. Though I can see that bind operation is successful. 

The code I used for this socket establishment is:

NetworkInterface nif = NetworkInterface.getByName("eth0");

Log.d(TAG,"Interface detected S");

Enumeration<InetAddress> nifAddresses = nif.getInetAddresses();

Log.d(TAG,"Interface IP Address Retrieved S: ");

Socket socket = new Socket();

try{

socket.bind(new InetSocketAddress(nifAddresses.nextElement(),1027));

Log.d(TAG,"Socket Bind S");

socket.connect(new InetSocketAddress(InetAddress.getByName("152.14.93.160"),80));

Log.d(TAG,"Socket Creation Success");

socket.close();

Log.d(TAG,"Socket Closed S");

} catch (Exception e1){

socket.close();

Log.d(TAG,"Socket Bind Error");

e1.printStackTrace();

}

} catch (Exception e1) {

// TODO Auto-generated catch block

Log.d(TAG,"Socket Creation Error");

e1.printStackTrace();

}

Also from the logcat the exception I see for the same is:

W/System.err(10996): java.net.SocketTimeoutException: Connection timed out

W/System.err(10996):  at org.apache.harmony.luni.platform.OSNetworkSystem.connect(Native Method)

W/System.err(10996):  at dalvik.system.BlockGuard$WrappedNetworkSystem.connect(BlockGuard.java:357)

W/System.err(10996):  at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:207)

W/System.err(10996):  at org.apache.harmony.luni.net.PlainSocketImpl.connect(PlainSocketImpl.java:440)

W/System.err(10996):  at java.net.Socket.connect(Socket.java:1013)

W/System.err(10996):  at java.net.Socket.connect(Socket.java:956)

W/System.err(10996):  at com.example.pdwn.TService.onCreate(TService.java:98)

W/System.err(10996):  at android.app.ActivityThread.handleCreateService(ActivityThread.java:2223)

W/System.err(10996):  at android.app.ActivityThread.access$2500(ActivityThread.java:132)

W/System.err(10996):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1102)

W/System.err(10996):  at android.os.Handler.dispatchMessage(Handler.java:99)

W/System.err(10996):  at android.os.Looper.loop(Looper.java:150)

W/System.err(10996):  at android.app.ActivityThread.main(ActivityThread.java:4293)

W/System.err(10996):  at java.lang.reflect.Method.invokeNative(Native Method)

W/System.err(10996):  at java.lang.reflect.Method.invoke(Method.java:507)

W/System.err(10996):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:849)

W/System.err(10996):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:607)

W/System.err(10996):  at dalvik.system.NativeStart.main(Native Method)

 I am not sure why, the connect function is timing out. Specially given that ping operation is successful. Any help will be greatly appreciated.

Thanks,

Arpit.

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