Please see if the information in the following thread is of help
capture client details
Quoting from the same thread
After the listen step with the following code you can get the clientIP:ClientPort. The individual values will be stored in fl_ClientIP & fl_ClientPort respectively
import com.itko.lisa.vse.stateful.model.Request;
import com.itko.lisa.vse.stateful.protocol.DataProtocol;
import com.itko.util.Parameter;
import com.itko.util.ParameterList;
Request request = (Request) testExec.getStateObject("lisa.vse.request");
String clientip = request.getMetaData().get("lisa.vse.request.client.id");
String[] ClientUrl = clientip.split(":");
testExec.setStateValue("fl_ClientIP", ClientUrl[0] );
testExec.setStateValue("fl_ClientPort", ClientUrl[1] );
return clientip;