system configuration

[Gil]

Hi,

I am a newbie to BLE 5 and I need some consulting regarding a system configuration.

The system is as such:

first unit (board #1) is an electronic lock that is installed on the interior side of a door. it is powered by a ~2000mAh rechargeable battery, therefore power consumption should be as small as possible. 

second unit (board #2) is a keypad unit which is installed on the exterior side of the door (keypad does not need to communicate with a cellphone). It is powered by a coin battery, so power consumption with this unit has to be very very small.

A full duplex communication should be held between board #2 and board #1 at all time (or most of it).

Board #1 has settings, so it also needs to be able to communicate with smartphone that can configure its settings.

What would be the best GATT/GAP roles for this type of configuration? 

Regards,

Gil

[Gil]

My question was actually about who should play the central role and who should play the peripheral role?

[Kenneth]

The device that have the tightest power constrain typically is the peripheral device.

Best regards,
Kenneth

[Gil]

Thanks!