udp: determine local port?

[John Craig]

Alex Tweedly wrote:

> I don't know of a way to do this directly - certainly nothing I can 
> see in the docs, and haven't seen it done.
>
> There is a pretty nasty (but generally effective) way to do it .....


Thanks, Alex.  The reason I asked was that I have hooked up an Aviosys 
IP POWER 9200 box to a network.  It has digi inputs and outputs for 
controlling mains appliances.  You can set the port that it accepts data 
on, but it always replies on another  port, so the handler for UDP 
replies never gets called.  I thought if I could determine the local 
port used I could then listen for the reply data.  I'm just using the 
default port that it sends the replies to and it's working fine.

:-)