Component/bt: add gattc and gatts coex example

examples/bluetooth/gattc_gatts_coex/CMakeLists.txt

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+# The following lines of boilerplate have to be in your project's CMakeLists
+# in this exact order for cmake to work correctly
+cmake_minimum_required(VERSION 3.5)
+
+include($ENV{IDF_PATH}/tools/cmake/project.cmake)
+project(gattc_gatts_coex)

examples/bluetooth/gattc_gatts_coex/Makefile

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+#
+# This is a project Makefile. It is assumed the directory this Makefile resides in is a
+# project subdirectory.
+#
+
+PROJECT_NAME := gattc_gatts_coex
+
+COMPONENT_ADD_INCLUDEDIRS := components/include
+
+include $(IDF_PATH)/make/project.mk

examples/bluetooth/gattc_gatts_coex/README.md

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+ESP-IDF Gattc and Gatts Coexistence example
+==============================================
+
+This example demonstrates the coexistence of gattc and gatts.
+
+This example creates a GATT service and starts ADV. The ADV name is `ESP_GATTS_DEMO`, then waits to be connected. At the same time, a gatt client is created, the ADV name is `ESP_GATTS_DEMO`, the device is connected, and the data is exchanged. If the device is not found within 120 seconds, the example will stop scanning.
+
+ESP-IDF also allows users to create a GATT service via an attribute table, rather than add attributes one by one. And it is recommended for users to use. For more information about this method, please refer to [gatt_server_service_table_demo](../gatt_server_service_table).
+
+To test this example, you can run the [gatt_client_demo](../gatt_client), which can scan for and connect to this example automatically, and run [gatt_server_demo](../gatt_server), Waiting to be connected. They will start exchanging data once the GATT client has enabled the notification function of the GATT server.
+
+Please check the [tutorial](tutorial/Gatt_Server_Example_Walkthrough.md) for more information about the gatts part of this example.
+Please check the [tutorial](tutorial/Gatt_Client_Example_Walkthrough.md) for more information about the gattc part of this example.
+

examples/bluetooth/gattc_gatts_coex/main/CMakeLists.txt

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+set(COMPONENT_SRCS "gattc_gatts_coex.c")
+set(COMPONENT_ADD_INCLUDEDIRS ".")
+
+register_component()

examples/bluetooth/gattc_gatts_coex/main/component.mk

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+#
+# "main" pseudo-component makefile.
+#
+# (Uses default behaviour of compiling all source files in directory, adding 'include' to include path.)

examples/bluetooth/gattc_gatts_coex/sdkconfig.defaults

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+# Override some defaults so BT stack is enabled
+# by default in this example
+CONFIG_BT_ENABLED=y
+CONFIG_BTDM_CTRL_MODE_BLE_ONLY=y
+CONFIG_BTDM_CTRL_MODE_BR_EDR_ONLY=
+CONFIG_BTDM_CTRL_MODE_BTDM=