With my android device set up as a hotspot/Access point(AP), how can I use JmDNS(3.4.0) to find other devices connected to this AP?
Using a regular AP everything works fine when creating the JmDNS instance the normal way;
jmdns = JmDNS.create();
But using my device as an AP this throws exception.
java.net.SocketException: No such device
at org.apache.harmony.luni.platform.OSNetworkSystem.setSocketOption(Native Method)
at dalvik.system.BlockGuard$WrappedNetworkSystem.setSocketOption(BlockGuard.java:382)
at org.apache.harmony.luni.net.PlainDatagramSocketImpl.setOption(PlainDatagramSocketImpl.java:198)
at org.apache.harmony.luni.net.PlainDatagramSocketImpl.join(PlainDatagramSocketImpl.java:137)
at java.net.MulticastSocket.joinGroup(MulticastSocket.java:190)
at javax.jmdns.impl.JmDNSImpl.openMulticastSocket(JmDNSImpl.java:459)
at javax.jmdns.impl.JmDNSImpl.<init>(JmDNSImpl.java:420)
at javax.jmdns.JmDNS.create(JmDNS.java:60)
I've also tried creating the JmDNS instance with the local IP
jmdns = JmDNS.create( InetAddress.getByName("192.168.1.1") );
which just throws the same exception.
How can I make JmDNS find services connected to the local AP?
It is not possible to use multicast on a local hotspot since it's not possible to acquire the multicast lock. Thus JmDNS will not work.
For anyone else having this problem, the alternative solution of finding connected devices I ended up using is based on parsing /proc/net/arp