Hello everyone! I've been looking into using a wireless bluetooth module lately, but there are still a few kinks to work out. Hope you guys can give me some advice.

In my project, I need to use the Bluetooth module to communicate with mobile devices and transfer some data. I would like to know how to choose a suitable bluetooth module and how to integrate and program it in an embedded system. Also, I would like to know some considerations about the stability and security of bluetooth connection. If there are any recommended references or resources, I would be very grateful!