normis: one usefull application may be “proximity marketing”.
I was working on a ebedded system with linux an Bluez stack to send multimedia messenges to all mobile phones with active bluetooth, but i have not skill programming in C and I could only do small tests.
We use RouterBoard as unified wireless communication platform connected to 2G, 3G, WiFi and Satellite Services. Our implementations in Ports, Terminals and Production environments more and more also demanding bluetooth since maly PLC systems and their user panels do not use WiFi anymore but Bluetooth instead. They only need 20m radius and have less issues with overlapping, inband interference etc. So, from a professional perspective it is worth looking at it.