78 lines
2.2 KiB
ReStructuredText
78 lines
2.2 KiB
ReStructuredText
.. _bluetooth:
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Bluetooth Implementation
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########################
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Initialization
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**************
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Initialize the Bluetooth subsystem using :c:func:`bt_init()`. Caller shall
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be either task or a fiber. Caller must ensure that function succeeds by
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checking return code for errors.
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APIs
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****
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The following Bluetooth APIs are provided:
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:c:func:`bt_enable()`
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Enables the Bluetooth subsystem.
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:c:func:`bt_le_adv_start()`
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Sets up advertisement, scans for data, and starts advertising.
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.. todo:: Describe all API
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Bluetooth Application Example
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*****************************
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A simple Bluetooth beacon application is shown below. The application
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initializes a Bluetooth Subsystem and enables non-connectable advertising.
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It acts as a Bluetooth Low Energy broadcaster.
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.. literalinclude:: ../../../samples/bluetooth/beacon/src/main.c
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:language: c
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:lines: 19-
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:linenos:
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Testing with QEMU
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*****************
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A Bluetooth application might be tested with QEMU. In order to do so,
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a Bluetooth controller needs to be connected to the emulator.
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Using Host System Bluetooth Controller in QEMU
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==============================================
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The host system's Bluetooth controller is connected to the second QEMU
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serial line using a UNIX socket. This socket employs the QEMU option
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:literal:`-serial unix:/tmp/bt-server-bredr`. This option is already
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added to QEMU through :makevar:`QEMU_EXTRA_FLAGS` in the Makefile.
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On the Host side, BlueZ allows to "connect" Bluetooth controller through
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a so-called user channel.
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#. Use the btproxy tool to open the listening UNIX socket, type:
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.. code-block:: console
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$ sudo tools/btproxy -u
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Listening on /tmp/bt-server-bredr
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.. note:: Ensure that the Bluetooth controller is down before using the
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btproxy command.
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#. To run Bluetooth application in the QEMU, go to application folder and type:
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.. code-block:: console
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$ make qemu
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.. note:: Bluetooth sample applications are located in
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:literal:`samples/bluetooth` folder.
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Running QEMU now results in a connection with the second serial line to
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:literal:`bt-server-bredr` UNIX socket.
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Now, an application can use the Bluetooth device.
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