I continue my test with this chip, and solved an issue in declaring children of a node
I tried the relay actuator with 2 relays, the second one never wanted to get an ACK message for the presentation message
I tried with 3 children relays , first is ACK, second still NACK and 3rd .... ACK again !
Even if it was not my first thought, i finally insert a wait(1000) between each present line which solved the problem
hope it can help