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Bluetooth Low Energy

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Introduction to Bluetooth Low Energy

The peripheral is known as the GATT Server, which holds the ATT lookup data and service and characteristic definitions, and the GATT Client (the phone/tablet), which sends requests to this server

https://learn.adafruit.com/introduction-to-bluetooth-low-energy/gatt

All transactions are started by the main device, the GATT Client, which receives response from the secondary device, the GATT Server

https://learn.adafruit.com/introduction-to-bluetooth-low-energy/gatt