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Released: Feb 3, View statistics for this project via Libraries. The goal of this library is to only have a small number of dependencies and to be easily installable even in a Python virtual environment without —system-site-packages. Hopefully you are here you are here with some basic knowledge of Bluetooth and you understand that Bluetooth Classic and Bluetooth BLE are different. This library is only going to work with BLE. It will also only be a Central device connecting to a Peripheral device. The two key things that you will need to know about the peripheral device you want to connect to is its address and the UUID of the GATT characteristic you want to interact with. This will be in the form of a mac address. This is 6 pairs of numbers separate by colons. Gatt And Its Eventual Development

The client then searches for available characteristics and subscribes to a known characteristic in order to receive notifications or indications. The example can register an Application Profile and initializes a sequence of events, which can be used to configure Generic Access Profile GAP parameters and to handle events such as scanning, connecting to peripherals and reading and writing characteristics.

These Gatt And Its Eventual Development are required for the FreeRTOS and underlaying system components to run, including the logging functionality and a library to store data in non-volatile flash memory. The main function starts by initializing the non-volatile storage library.

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This library allows to save key-value pairs in flash memory and is used by some components such as the Wi-Fi library to save the SSID and password:. The controller configuration includes setting the BT controller stack size, priority and HCI baud rate. Moreover, the event handlers are also used to handle read and write events coming from the central. The GAP event handler takes care of scanning and connecting to servers and the GATT handler manages events that happen after the client has connected to a server, such as searching for services and writing and reading data.

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The Application Profiles are a way to group functionalities that are designed for one or more server applications. For example, you can have an Application Profile connected to the Heart Rate Sensors, and another one connected to the Temperature Sensors.

The initialization of the Application Profile table array includes defining the callback functions for each Profile. The handler takes the GATT interface returned by the event and stores it in the profile table:. The GATT client normally scans for nearby servers and tries connect to them, if interested.

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However, in order to perform the scanning, first the configuration parameters need to be set. This structure is defined as:. The BLE scan parameters are configured so that the type of scanning is active includes reading the scanning responseit is of public type, allows any advertising device to be read and has a scanning interval of ms 1. This event is used to start the scanning of nearby GATT servers:. If it equals to the device name of the GATT Server we are interested in, then the scanning is stopped.

Then the device name is printed. This function takes as parameters the Application Profile GATT interface, the remote server address and a boolean value. Notice that the client opens a virtual connection to the server.]