There are shortened UUIDs for all types, services, and profiles specified in the SIG (Bluetooth Special Interest Group).īut if your application needs its own UUID, you can generate it using this UUID generator website. An UUID is a unique 128-bit (16 bytes) number. Basically, it contains the operations and procedures that can be used with the characteristic:Įach service, characteristic and descriptor have an UUID (Universally Unique Identifier). The properties describe how the characteristic value can be interacted with. The characteristic always has two attributes: characteristic declaration (that provides metadata about the data) and the characteristic value.Īdditionally, the characteristic value can be followed by descriptors, which further expand on the metadata contained in the characteristic declaration. The characteristic is always owned by a service, and it is where the actual data is contained in the hierarchy (value). BLE consumes approximately 100x less power than Bluetooth (depending on the use case). Unlike Bluetooth that is always on, BLE remains in sleep mode constantly except for when a connection is initiated. BLE’s primary application is short distance transmission of small amounts of data (low bandwidth). What is Bluetooth Low Energy?īluetooth Low Energy, BLE for short, is a power-conserving variant of Bluetooth.
#UUID GENERATOR ANDROID HOW TO#
Recommended reading: learn how to use ESP32 Bluetooth Classic with Arduino IDE to exchange data between an ESP32 and an Android smartphone. Introducing Bluetooth Low Energyįor a quick introduction to BLE, you can watch the video below, or you can scroll down for a written explanation. For a simple introduction we’ll create an ESP32 BLE server, and an ESP32 BLE scanner to find that server.
First, we’ll explore what’s BLE and what it can be used for, and then we’ll take a look at some examples with the ESP32 using Arduino IDE. This post is a quick introduction to BLE with the ESP32. The ESP32 comes not only with Wi-Fi but also with Bluetooth and Bluetooth Low Energy (BLE).
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