Bluetooth interface layer

Right now it properly uses API from bsp/bsp-bluetooth and BlueKitchen stack.
It's meant to provide interface layer for service-bluetooth like that:

os calls <=> service-bluetooth <=> module-bluetooth <=> bluetooth library <=> bsp/bluetooth

Layout

• Bluetooth
  • interface code - for other modules to use
    • profiles - implementation of Bluetooth profiles
  • glucode code needed for libraries to work
• lib Libraries used with as little modifications as possible

Supported profiles

• A2DP
• HSP
• HFP (Currently not supported)

NOTE: Remote devices that do not support at least one of above profiles will not be added to list of devices during scan process.

Events flowchart

Table of content

• Bluetooth on/off operation
• Bluetooth scan operation

Proposal of Bluetooth settings data flow

The Bluetooth settings related data flow is directed by three main entities:

1. ServiceDB that is responsible for storing data in DB
2. ServiceBluetooth that is responsible for general Bluetooth management, and communication between ServiceDB and ApplicationSettings
3. ApplicationSettings that is responsible for PurePhone<->User interactions in this context

ServiceBluetooth communicates with ServiceDB via SettingsAgent, and uses BluetoothMessages for communication with ApplicationSettings. It contains BluetoothSettings object for caching settings received from ServiceDB and ApplicationSettings. ServiceBluetooth uses BluetoothWorker to control bluetooth stack.

When ServiceBluetooth is being created, it registers on a value change in DB for each variable related to BluetoothSettings and binds callback functions for them. When DB responds with new values of BluetoothSettiings - related variables, callback function of each variable stores its value in cache object (BluetoothSettings) in ServiceBluetooth, then unregisters from changes in DB. When all variables are loaded from DB, then BluetoothWorker reloads Bluetooth stack with data from BluetoothSettings object.

Flowchart below is an example of scenario, when user opens BluetoothWindow, and tries to change some of settings presented there.