Delta AS332 UDP socket

[_Pavel_ 0]

Hello everybody,
could please someone give an idea

I want to communicate to AS332 via UDP. I have tried and it works, but the problem is: to create an UDP socket i have to set-up first, statically (!!??), the comms partner IP address
But: i don't know the partner's IP address. There could be different partners. I want the PLC to obtain the partners IP address from the partner's query just to answer.
And I don't understand, why the socket is connected to the alien's IP address, it must be connected to the own IP address, because the first task of an UDP socket is to "listen", isn't it? 

So my questions are:

- how to receive a packet from any partner via UDP, not setting-up the partner's IP first?
- can I use dynamic destination IP address for the "SSEND" instruction?
- can I have access to the whole L3 or L2 data packet, where I can obtain the client's IP address from?

Thanks!