Connection via socket

Hi Gurus!!

I have a technical doubt.

I have connected my R/3 via socket with an external application. On the same socket, we send a request and receive a response, through a Java Proxy.

Now, I have to change the design, because the external application send the reponse through a different port from the request is sent.

How could I create with Java Proxy an application who listen the response from this external application, and trigger a BPM on XI?

Any help will be very useful.

Thanks and regards,

Manuel Míguez.