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POHow to broadcast in a wifi network of Android phones
 

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  1. POHow to broadcast in a wifi network of Android phones
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    <p>I have a network of android phones, in which one of the phone acts as server. I try to do a broadcast using the destination IP as <code>'255.255.255.255.'</code>. But it fails to send message. I give the logcat below. The server IP is <code>192.168.43.1</code>. I have also tried with <code>'192.168.43.255'</code>. But it too ended up in vain. For code, I had referred <a href="http://thinkandroid.wordpress.com/2010/03/27/incorporating-socket-programming-into-your-applications/" rel="nofollow">http://thinkandroid.wordpress.com/2010/03/27/incorporating-socket-programming-into-your-applications/</a></p> <pre><code>05-30 20:17:40.970: E/ClientActivity(698): java.net.UnknownHostException: /192.168.43.255 05-30 20:17:40.970: E/ClientActivity(698): at java.net.InetAddress.lookupHostByName(InetAddress.java:506) 05-30 20:17:40.970: E/ClientActivity(698): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:294) 05-30 20:17:40.970: E/ClientActivity(698): at java.net.InetAddress.getByName(InetAddress.java:325) 05-30 20:17:40.970: E/ClientActivity(698): at project.android.aec.ConnectActivity$ClientThread.run(ConnectActivity.java:139) 05-30 20:17:40.970: E/ClientActivity(698): at java.lang.Thread.run(Thread.java:1019) </code></pre> <p>The following is the code used to get broadcast IP</p> <pre><code> private InetAddress getBroadcastAddress() throws IOException { mWifi= (WifiManager) getSystemService(Context.WIFI_SERVICE); DhcpInfo dhcp = mWifi.getDhcpInfo(); if (dhcp == null) { Log.d("BCast Address Fetch", "Could not get dhcp info"); return null; } int broadcast = (dhcp.ipAddress &amp; dhcp.netmask) | ~dhcp.netmask; byte[] quads = new byte[4]; for (int k = 0; k &lt; 4; k++) quads[k] = (byte) ((broadcast &gt;&gt; k * 8) &amp; 0xFF); return InetAddress.getByAddress(quads); } </code></pre>
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    1. COAnd submask...?
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    2. CONetmask is 255.255.255.0. I have edited the question to add the code used to find broadcast address. In my case, it is 192.168.43.255
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