If you aren't familiar with GATT or BLE.Adafruit Bluefruit LE SPI Friend documentation.This tutorial is not intended to be translatable into a production-ready application - this is simply an introduction to BLE.
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How to program an Android device to act as the GATT client to read the data from the GATT server.How to program the Adafruit Bluefruit LE SPI Friend to act as a GATT server for these custom services & characteristics.How to design custom GATT services and characteristics.To make matters more difficult, Adafruit does not provide any guidance on designing mobile applications to pair with their BLE modules and the source code for their applications is difficult to reverse engineer. However, when creating custom hardware there is often a need to create custom services and attributes and there aren't many tutorials available. There are three fundamental concepts in BLE: profiles, services, and attributes.īluetooth SIG has standardized many common profiles, services, and attributes.
Most application profiles utilize the General Attribute Profile (GATT) to send data over a BLE link. The Bluetooth Special Interest Group (SIG) defines several specifications a device should implement to interact with a Bluetooth device, which they term "profiles". Wearable devices, like the smart garments I help design at Predictive Wear, must limit power consumption wherever possible to extend battery life, and frequently utilize BLE. Bluetooth Low Energy (BLE) is a form of low power Bluetooth communication.
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