Message based load balancing for no standard message format

1. Yes. It isn't documented, but the gist of it is this:

First, you need to add the mblb profile to your virtual server using the command line -

(tmos.ltm) modify virtual my_vs profiles add { mblb }

Now you can write a rule that uses TCP::collect, TCP::release (make it equal to the message size), and TCP::notify to find and process the messages and USER_REQUEST & USER_RESPONSE to act on them; apply the rule to my_vs.

It works best if your message is fixed length or if each message fits in a single TCP packet, but you can still get it to work if neither are the case. Just remember that when inspecting each packet you will take a performance hit.