BLE Relay System

[hkartadi]

Hi all,

Basically I am doing an exercise on the BLE system use case. Let's say I want to setup a BLE system where there are the long range BLE capabilities in Relays and the End Devices is shorter range with power saving mode. Below is the rough diagram:

Central Base -------------------- Relay 1 ----------------- Relay 2 ----- End Device 2

                                  \                        \
                                   \                        \
                                    \                        \
                                End Device 1             End Device 3

End Devices can move around and closest relay will serve as their central once the end devices advertise

Question is:

1. Central Base is also equipped with NFC reader, we would like to introduce new End Device (lets say End Device 4) into the system. Pair using OOB to Central Base and bonding information is stored. Can this bond information be shared onto the entire system (e.g. Relay 1 and Relay 2)? how to do this?

2. On this use case, what is the best method to introduce a new End Device into the system? or point #1 above is the best?

3. Should we set the End Device to be able to connect to just one server relay (not multiple relay simultaneously) even when both relays are consider close to the end device.

4. What would be the best mechanism to relay the message from Relay 2 to Relay 1 to Central Base? or Relay 1 to Central Base?

Thank you

Handi

[hkartadi]

Hi Hung Bui, thanks for the information. May I know which LTK key variable I would need to look for? and to which bond storage I need to store this new LTK value on new relay station?