room = Hash.of(cli.getOptionValue("wall", "42"));
NioDatagramAcceptor acceptor = new NioDatagramAcceptor();
handler = new SwitchHandler(acceptor);
TapRule wallRule = tf.createTapRule();
wallRule.setIs(tf.createTelex().withEnd(room));
wallRule.getHas().add("+wall");
handler.addTapRule(wallRule);
logger.info("Using tap rule {}", JsonMapper.toJson(wallRule));
handler.addTelexHandler(new TelexHandler() {