How to check if it doesn't work ?

- java -DIVY_DEBUG fr.dgac.ivy.Probe ...

- check the rendez-vous, either in UDP broadcast or TCP multicast
  * network available
  * it works without ivy
  * it works in ivy-c
  * it should work in ivy-java

- it should be symetric, whatever the order of the connections ( client A,
  client B, client C vs A, C, B ... )

- the regexps should function properly, let's build a little testbench