Subsys: Bluetooth: Add documentation for the RRSP

This adds documentation for the Ranging Service Ranging Responder.

Signed-off-by: Timothy Keys <[email protected]>

doc/nrf/libraries/bluetooth/services/rrsp.rst

@@ -0,0 +1,59 @@
+.. _rrsp_readme:
+
+Ranging Responder (RRSP)
+########################
+
+.. contents::
+   :local:
+   :depth: 2
+
+Overview
+********
+
+This library implements the Ranging Responder for Channel Sounding with the corresponding set of characteristics defined in the `Ranging Service Specification`_ and the `Ranging Profile Specification`_.
+
+Supported features
+==================
+
+- On Demand Ranging Data
+
+Configuration
+*************
+
+Enable RREQ and RRSP kconfig options with :kconfig:option:`CONFIG_BT_RAS` kconfig option.
+
+Set the maximum number of antenna paths supported by the device using the :kconfig:option:`CONFIG_BT_RAS_MAX_ANTENNA_PATHS` kconfig option.
+This sets the antenna paths per step that can be stored inside the Ranging Service.
+This value must match the supported Channel Sounding capabilities of the device.
+This affects the per-instance memory usage of the Ranging Service.
+
+Set support for storing Mode 3 Channel Sounding steps using the :kconfig:option:`CONFIG_BT_RAS_MODE_3_SUPPORTED` kconfig option.
+This will allocate memory for the Ranging Service to store Mode 3 Channel Sounding steps.
+This value must match the supported Channel Sounding capabilities of the device.
+This affects the per-instance memory usage of the Ranging Service.
+
+Enable RRSP kconfig options using the :kconfig:option:`CONFIG_BT_RAS_RRSP` kconfig option.
+
+Set new connections to be allocated a RRSP instance automatically using the :kconfig:option:`CONFIG_BT_RAS_RRSP_AUTO_ALLOC_INSTANCE` kconfig option.
+
+Set the number of simultaneously supported RRSP instances using the :kconfig:option:`CONFIG_BT_RAS_RRSP_MAX_ACTIVE_CONN` kconfig option.
+
+Set the number of ranging data buffers per connection using the :kconfig:option:`CONFIG_BT_RAS_RRSP_RD_BUFFERS_PER_CONN` kconfig option.
+
+Set the logging level of the RRSP library using the :kconfig:option:`CONFIG_BT_RAS_RRSP_LOG_LEVEL` Kconfig option.
+
+Usage
+*****
+
+The RRSP can be setup as either a Channel Sounding Initiator or Reflector.
+
+See the sample: :file:`samples/bluetooth/channel_sounding_ras_initiator`
+See the sample: :file:`samples/bluetooth/channel_sounding_ras_reflector`
+
+API documentation
+*****************
+
+| Header file: :file:`include/bluetooth/services/ras.h`
+| Source files: :file:`subsys/bluetooth/services/ras`
+
+.. doxygengroup:: bt_ras