@Override
 protected boolean isWriteConnected(PVAChannelHandler channel) {
   // NOTE: access-rights not yet supported
   final Channel c = channel.getChannel();
   return c != null && c.isConnected();
 }
 @Override
 public boolean isConnected(PVAChannelHandler channel) {
   final Channel c = channel.getChannel();
   return c != null && c.isConnected();
 }