Unhappy [Q] Bluetooth

Hello all,

I'm trying to make a short range messaging app that allows people in bluetooth range to just send messages out to whoever might be listening. I've been looking everywhere for how this might be done but I've come up nearly empty handed. I'm almost ready to give up, but when I was examining the way bump sends files there is no pairing to be done it just seems to work. Does anyone know how I might accomplish my goal?

Thank you!