feat(ble): write HCI layer log file

Adds an option to write a btsnoop compatible log file containing BLE traffic. A new file is created after each boot if BLE is activated and the ble_log_enable option is set in card10.cfg. The last 10 logs are kept via log rotation.

Documentation/card10-cfg.rst

@@ -34,12 +34,14 @@ Float     A single-precision (32-bit) floating-point number in base 10. Example:
 Supported options
 -----------------
 
-=============== ========== ===========
-Option name     Type       Description
-=============== ========== ===========
-``execute_elf`` Boolean    Allow running of binary :ref:`l0dables`. These files can be nefarious, so this option is off by default.
---------------- ---------- -----------
-``timezone``    String     Timezone for card10; must be of format ``[+-]HHMM``.  Examples: ``+0800``, ``-0200``
---------------- ---------- -----------
-``default_app`` String     Full path to the exectutable file of the default application. If this option is not set,``apps/analog_clock/__init__.py`` is used.
-=============== ========== ===========
+================== ========== ===========
+Option name        Type       Description
+================== ========== ===========
+``execute_elf``    Boolean    Allow running of binary :ref:`l0dables`. These files can be nefarious, so this option is off by default.
+------------------ ---------- -----------
+``timezone``       String     Timezone for card10; must be of format ``[+-]HHMM``.  Examples: ``+0800``, ``-0200``
+------------------ ---------- -----------
+``default_app``    String     Full path to the exectutable file of the default application. If this option is not set,``apps/analog_clock/__init__.py`` is used.
+------------------ ---------- -----------
+``ble_log_enable`` Boolean    Activate HCI level logging of BLE data. Creates a new btsnoop compatible log file named ``ble.log`` in the ``logs`` folder after each boot if BLE is activated. Keeps the last 10 files.
+================== ========== ===========