Android WiFi Direct Demo Issues

Question

im testing the new technology wifi direct and im having some issues using the wifi direct demo from the samples that come with the android-sdk.

So, I have two devices A and B, both with android 4.0.3.

First, from device A, I send a file to B. Nothing wrong here, B receives the file.

Then A disconnects from B.

Now, from device B I try to send a file to A.

But the device that receives the file is B, instead of A.

To fix, i need to turn off and on both devices...

Also, sometimes when i click disconnect and try to connect again, connection fails and i have to disable and enable wifi direct...

Anyone else experiencing this?

Is it because the new technology is not mature yet or maybe something wrong with my build/driver/etc or maybe this demoapp doesnt support two-way sharing. Any ideas and/or explanations would be apreciated.

Answer 1

When providing a WifiP2pConfig instance to the connect() function, you can set the groupOwnerIntent property of this configuration object as follows:

WifiP2pConfig config = new WifiP2pConfig();
config.deviceAddress = "...";                 // insert ip here
config.groupOwnerIntent = 0;
config.wps.setup = WpsInfo.PBC;
manager.connect(..., config, ...);

From the android reference:

This (the groupOwnerIntent) is an integer value between 0 and 15 where 0 indicates the least inclination to be a group owner and 15 indicates the highest inclination to be a group owner.

Furthermore, the demo probably repeatedly sends the file to the same device because there is always made a socket connection to the ip-address obtained from:

WifiP2pInfo.groupOwnerAddress

If you would like to support bidirectional communication, the first step in setting this up would be sending the ip-address of the non group owner to the group owner.

As far as the disconnect/reconnect problem goes, I seem to have the same inconsistencies with Android 4.0.2 devices.