Data Exchange between two android devices over hotspot

Question

I want to exchange data over hotspot between two android devices. I've tried to properly connection.

1st. I created portable hotspot:

Network SSID - my_hotspot
Security - WPA PSK
Password - password

2nd. I'm attempting to connect when application is launched. Here is my code

    mWifiManager = (WifiManager) this.getSystemService(Context.WIFI_SERVICE);

    WifiConfiguration conf = new WifiConfiguration();
    conf.SSID = "\"" + networkSSID + "\"";   
    conf.wepKeys[0] = "\"" + networkPass + "\""; 
    conf.wepTxKeyIndex = 0;
    conf.allowedGroupCiphers.set(WifiConfiguration.GroupCipher.WEP40); 
    conf.preSharedKey = "\""+ networkPass +"\"";
    conf.allowedKeyManagement.set(WifiConfiguration.KeyMgmt.WPA_PSK);
    
    int res = mWifiManager.addNetwork(conf);
    boolean b = setWifiApEnabled(null, true);

I assume it was unsuccessfully. Then i'm trying sending data via socket. I've learned from JavaCodeGeeks. I configured SERVER_IP 192.168.49.1, SERVER_PORT:8888.

How to communicate correctly between two Android devices using hotspot?

Thanks in advance.

Answer 1

Why don't you use Wi-Fi Direct? It is a p2p protocol. You can share data between two Android devices without any need of hotspot. It uses android.net.wifi.p2p package.

Wi-Fi peer-to-peer (P2P) allows Android 4.0 (API level 14) or later devices with the appropriate hardware to connect directly to each other via Wi-Fi without an intermediate access point (Android's Wi-Fi P2P framework complies with the Wi-Fi Alliance's Wi-Fi Direct™ certification program). Using these APIs, you can discover and connect to other devices when each device supports Wi-Fi P2P, then communicate over a speedy connection across distances much longer than a Bluetooth connection. This is useful for applications that share data among users, such as a multiplayer game or a photo sharing application.

You can find more information on Android developer site about this technology. Here are some useful links:

Android Wi-Fi p2p

android.net.wifi.p2p package

Creating the application