The document said:

int setSendingPort(object me, integer sendingPort)
—————————
...
ex: err = gUDPXtra.setSendingPort(VOID)

But if you do so, asUDP will return an error "integer expected".

You are right ! It should work. Use 0 for now, for the same effect.

On my todo list (which starts to be a bit long - will try to fix all this ASAP).