is that possible ?

[baja]

Hello
I run a restaurant. I read that the user can automatically connect to pineapple. it's a great solution. 
I am looking for opportunities to send a push message to people in my restaurant and passing by. Like the google nearby.
A stranger joining the wifi pineapple gets an invitation to dinner or promotion information.
Is it possible ?
If not, can someone add such a module?

thank you and I am waiting for an answer

Bartek