samples: bluetooth: adding central_otc sample

Added a Bluetooth Central sample that demonstrates how to use
GATT Object Transfer Profile.

Signed-off-by: Pirun Lee <[email protected]>

Author: pirun

samples/bluetooth/central_otc/CMakeLists.txt

@@ -0,0 +1,11 @@
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(central_otc)
+
+target_sources(app PRIVATE
+  src/main.c
+)
+
+zephyr_library_include_directories(${ZEPHYR_BASE}/samples/bluetooth)

samples/bluetooth/central_otc/README.rst

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+.. _central_otc:
+
+Bluetooth: Central OTC
+######################
+
+Overview
+********
+
+Similar to the :ref:`Central <bluetooth_central>` sample, except that this
+application specifically looks for the OTS (Object Transfer) GATT Service.
+And this sample is to select object sequentially, to read metadata, to write data,
+to read data of selected ojects.
+
+Requirements
+************
+
+* A board with BLE support and 4 buttons.
+
+Building and Running
+********************
+This sample can be found under :zephyr_file:`samples/bluetooth/central_otc` in the
+Zephyr tree.
+
+See :ref:`bluetooth samples section <bluetooth-samples>` for details.

samples/bluetooth/central_otc/prj.conf

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+CONFIG_BT=y
+CONFIG_BT_CENTRAL=y
+CONFIG_BT_OTS=y
+CONFIG_BT_SMP=y
+CONFIG_BT_OTS_CLIENT=y
+# This example requires more workqueue stack
+CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=8192
+
+CONFIG_LOG=y
+CONFIG_ASSERT=y
+CONFIG_BT_L2CAP_TX_BUF_COUNT=8

samples/bluetooth/central_otc/sample.yaml

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+sample:
+  name: Bluetooth Central Object transfer client
+tests:
+  sample.bluetooth.central_otc:
+    harness: bluetooth
+    platform_allow: nrf21540dk_nrf52840 nrf52840dk_nrf52840 nrf52833dk_nrf52833
+    tags: bluetooth