Thank you so much for this quick answer ! This is definitely making me more confident in what i am doing !
So the different ssid will have the same mac address, on the same channel; That's good for me. And, from your answer, i'm deducing that is no limit for the number of fake AP (aside from OpenWRT and hardware limitations of course); which also make me happy ^^
I just have to see how to resolve this legality issue ... Maybe if the connection is not established it would be more legal (and achieve the same purpose, which is to make the mobile send stuff). My only worry is that the mobiles, sort of, blacklist for a while those erroneous AP (but maybe i'll get around by running a continuous macchanger ?).
I'll search more about the legality stuff, but i'm not sure where to look, so if someone has ideas, i'm all listening ^^ . (It's not bound to a single country, but more focused on Australia, Belgium, France, Germany and others ).
Warning people and offering them the possibility to "opt out" looks pretty easy to implement and it's clearly one obvious and decent thing to do ! (If i'm not mistaking, the Pineapple has the possibility to "exclude" some custom mac addresses ? )
Thank's again !