Round-Robin based on client IP

Hi, thanks for your answers. I'm having a couple of ESME clients (SMPP), trying to reach a pool of 2 SMSCs. I could find a solution for the ones that opens only one BIND session (by replicating the BIND message) through an amazing iRule i've found here: https://devcentral.f5.com/questions/balancing-smpp-traffic-based-on-recipient-address

Now the only pending stuff is that I'm having some ESME that opens 2 sessions. The stuff with SMPP is that it's a sticky session. It will establish the session and then sends the SMS threads on it asynchronously. So I want client x.x.x.1 to open only one session in each pool member. I would probably go through Stephan proposition, but I'll need to get some time working on it. Do you guys have any samples? Thanks, BR//