A quick and dirty introduction to gatttool for accessing data from Bluetooth Low Energy devices

Bluetooth learning GATT

• Bluetooth GATT service uuid overview

see also

• Practical Introduction to BLE GATT Reverse Engineering: Hacking the Domyos EL500 - No security is bypassed, no exciting exploits are used, and no dangerous backdoors are found. We will simply connect to the device and determine how it works using straightforward methodologies.
  • Message Signatures - BLE devices can generate and use a dedicated signing key (CSRK) to digitally sign messages for authentication, integrity and non-repudiation purposes