Thanks, this is a good solution, but I hoped I could avoid it.
I hoped that there might be a way to "tell" the netsnmp library that I want to send another string or something like this.
You see, using these libraries , I merely give the integer value and "tell" it that it's an integer that I'm sending, all the rest is done for me (using : $request->setValue($type, $value), where type is INTEGER and value is my value;).
I hoped that maybe I could add another var or something that will hold the info I want to send (thinking about it, aesthetics don't matter so I don't really mind keeping the message and adding the info I want)
maybe somebody knows the netsnmp library and can help here ?