question: public JdpBroadcaster ( InetAddress address , InetAddress srcAddress , int port , int ttl ) throws IOException , JdpException { this . addr = address ; this . port = port ; ProtocolFamily family = ( address instanceof Inet6Address ) ? StandardProtocolFamily . INET6 : StandardProtocolFamily . INET ; channel = DatagramChannel . open ( family ) ; channel . setOption ( StandardSocketOptions . SO_REUSEADDR , true ) ; channel . setOption ( StandardSocketOptions . IP_MULTICAST_TTL , ttl ) ; if ( srcAddress != null ) { NetworkInterface interf = NetworkInterface . getByInetAddress ( srcAddress ) ; try { channel . bind ( new InetSocketAddress ( srcAddress , 0 ) ) ; } catch ( UnsupportedAddressTypeException ex ) { throw new JdpException ( "Unable to bind to source address" ) ; } channel . setOption ( StandardSocketOptions . IP_MULTICAST_IF , interf ) ; } }
target:  Create a new broadcaster