samples: bluetooth: silabs: Bluetooth blinky

Similar to Silabs' SOC Blinky sample, implements two GATT characteristics.
One characteristic controls the state of the LED via write operations from
a GATT client. Second characteristic sends notifications to subscribed
clients when the button state changes on the board.

Signed-off-by: Viktor Fisch <viktor.fisch@silabs.com>

Author: silabs-vifisch

samples/bt_blinky/CMakeLists.txt

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+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.20.0)
+
+find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
+project(peripheral_hr)
+
+FILE(GLOB app_sources src/*.c)
+target_sources(app PRIVATE
+  ${app_sources}
+  )
+
+zephyr_library_include_directories(${ZEPHYR_BASE}/samples/bluetooth)

samples/bt_blinky/README.rst

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+.. zephyr:code-sample:: bt_blinky
+   :name: Blueooth blinky (Peripheral)
+   :relevant-api: bluetooth
+
+   Similar to Silabs SOC Blinky
+
+Overview
+********
+
+Similar to the SOC Blinky sample, implements a simple custom GATT service with two characteristics.
+One characteristic controls the state of the LED (ON/OFF) via write operations from a GATT client,
+and the second characteristic sends notifications to subscribed clients when the button state changes
+(pressed or released).
+
+Requirements
+************
+
+* BlueZ running on the host, or
+* A board with Bluetooth LE support
+
+Building and Running
+********************
+
+Building a minimal variant
+--------------------------
+
+.. zephyr-app-commands::
+   :zephyr-app: samples/bt_blinky
+   :board: qemu_cortex_m3
+   :goals: build

samples/bt_blinky/prj.conf

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+CONFIG_BT=y
+CONFIG_LOG=y
+CONFIG_BT_SMP=y
+CONFIG_BT_PERIPHERAL=y
+CONFIG_BT_DIS=y
+CONFIG_BT_DIS_PNP=n
+CONFIG_BT_BAS=y
+CONFIG_BT_HRS=n
+CONFIG_BT_DEVICE_NAME="Blinky Example"
+CONFIG_BT_DEVICE_APPEARANCE=000

samples/bt_blinky/sample.yaml

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+sample:
+  name: Bluetooth Blinky
+  description: Similar to Silabs SOC Blinky
+tests:
+  sample.bt_blinky:
+    harness: bluetooth
+    integration_platforms:
+      - frdm_k64f
+      - qemu_cortex_m3
+    tags:
+      - bluetooth
+      - LED
+      - gpio
+    build_only: true