This is a good description of how to use command line tools to connect to BLE devices. This is not hacking or reverse engineering, but it can be used for it. A

This is a good description of how to use command line tools to connect to BLE devices. This is not hacking or reverse engineering, but it can be used for it. Also don't forget the Ubertooth, or multiple of them. Useful if you need to listen over multiple advertisement channels and need to know which channel receives what. Have fun!