Add FOTA Service mock example

BLE_GattServer_FOTAService/.mbed

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+ROOT=.

BLE_GattServer_FOTAService/.mbedignore

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+scripts/*

BLE_GattServer_FOTAService/CMakeLists.txt

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+# Copyright (c) 2020 ARM Limited. All rights reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+cmake_minimum_required(VERSION 3.19.0 FATAL_ERROR)
+
+set(MBED_PATH ${CMAKE_CURRENT_SOURCE_DIR}/mbed-os CACHE INTERNAL "")
+set(MBED_CONFIG_PATH ${CMAKE_CURRENT_BINARY_DIR} CACHE INTERNAL "")
+set(APP_TARGET BLE_GattServer_FOTAService)
+
+include(${MBED_PATH}/tools/cmake/app.cmake)
+
+add_subdirectory(${MBED_PATH})
+
+add_subdirectory(mbed-os-experimental-ble-services/services/FOTA)
+
+include_directories(mbed-os-experimental-ble-services)
+
+add_executable(${APP_TARGET})
+
+project(${APP_TARGET})
+
+target_sources(${APP_TARGET}
+        PRIVATE
+        source/main.cpp
+        source/BlockDeviceFOTAEventHandler.h
+        source/BlockDeviceFOTAEventHandler.cpp
+        source/PeriodicBlockDeviceEraser.h
+        source/PeriodicBlockDeviceEraser.cpp
+        )
+
+target_link_libraries(${APP_TARGET}
+        PRIVATE
+        mbed-os
+        mbed-events
+        mbed-ble
+        mbed-storage
+        mbed-mbedtls
+        ble-service-fota
+        )
+
+mbed_set_post_build(${APP_TARGET})
+
+option(VERBOSE_BUILD "Have a verbose build process")
+if(VERBOSE_BUILD)
+  set(CMAKE_VERBOSE_MAKEFILE ON)
+endif()

BLE_GattServer_FOTAService/README.md

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+# FOTA Service Mock Example
+
+The FOTA service, as defined in its [specification](https://github.com/ARMmbed/mbed-os-experimental-ble-services/blob/fota-service-github-ci/services/FOTA/docs/README.md) document, facilitates the transfer of firmware updates over BLE.
+
+In this demo, the FOTA service is used to transfer a binary from the host PC into the flash of the target. 
+A basic _FOTA client_, implemented in Python using [bleak](https://pypi.org/project/bleak/), is used to read/write the binary stream, control and status characteristics. 
+Please refer to [Section 1](https://github.com/ARMmbed/mbed-os-experimental-ble-services/tree/fota-service-github-ci/services/FOTA/docs#fota-service-structure) of the spec to learn more about these characteristics.
+
+To verify the success of the transfer, the application computes the [SHA-256](https://en.wikipedia.org/wiki/SHA-2) of the binary and prints it to the serial port.
+The SHA-256 is also computed on the host using [sha256sum](https://man7.org/linux/man-pages/man1/sha256sum.1.html).
+The transfer is regarded as a success if the hashes are equal.
+
+## Usage
+
+### Hardware Requirements
+
+This application requires either the [DISCO_L475VG_IOT01A](https://os.mbed.com/platforms/ST-Discovery-L475E-IOT01A/) or [NRF52840_DK](https://os.mbed.com/platforms/Nordic-nRF52-DK/) platforms.
+
+To use the Python client, the host PC must have Bluetooth capabilities, either through an inbuilt chipset or an external USB adapter.
+
+### Building 
+
+The application can be built and flashed onto the target using Mbed CLI 2:
+
+```shell
+mbed-tools deploy
+mbed-tools compile -t <toolchain> -m <target> -f
+```
+
+A `bin` file is required for the demo. 
+For nRF, this must be created manually from the `elf` as Mbed Tools outputs a `hex` file by default:
+
+```shell
+arm-none-eabi-objcopy -O binary cmake_build/NRF52840_DK/develop/<toolchain>/BLE_GattServer_FOTAService.elf cmake_build/NRF52840_DK/develop/<toolchain>/BLE_GattServer_FOTAService.bin
+```
+
+Lastly, create a Python virtual environment inside the `scripts` folder and install bleak:
+
+```shell
+cd scripts && mkdir venv && virtualenv venv && source venv/bin/activate
+python -m pip install --upgrade pip && pip install bleak
+```
+
+### Demonstration
+
+1. Open a serial terminal on the host PC to receive serial prints from the _FOTA target_: 
+
+   ```shell 
+   mbed term -b 115200
+   ```
+
+2. In a separate window, run the test script: 
+
+   ```
+   python test_fota.py
+   ```
+
+   It scans for a device named 'FOTA' and attempts to connect to it.
+   Once connected, it asks the user to enter the path to the binary.
+   Use the binary running on the target:
+
+   ```
+   Enter the path to the binary: ../cmake_build/<target>/develop/<toolchain>/BLE_GattServer_FOTAService.bin
+   ```
+
+3. The client initiates the transfer once the FOTA session begins and commits the update once the entire binary has been sent.
+   Subsequently, the target computes the SHA-256 of the binary and prints it to the serial.
+   Verify the `<hash>` with sha256sum:
+
+   ```shell
+   echo "<hash> ../cmake_build/<target>/develop/<toolchain>/BLE_GattServer_FOTAService.bin" | sha256sum --check
+   ```

BLE_GattServer_FOTAService/mbed-os-experimental-ble-services.lib

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+https://github.com/ARMmbed/mbed-os-experimental-ble-services/#7f7ed190a4d5da02a1340aeff3ed2e7bc9ee5b64

BLE_GattServer_FOTAService/mbed-os.lib

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+https://github.com/noonfom/mbed-os/#27160dbe0460ed5c898effbaf8881c39117ba505

BLE_GattServer_FOTAService/mbed_app.json

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+{
+    "target_overrides": {
+        "*": {
+            "platform.stdio-convert-newlines": true,
+            "platform.stdio-baud-rate": 115200,
+            "mbed-trace.enable": 1,
+            "mbed-trace.max-level": "TRACE_LEVEL_INFO",
+            "ble-api-implementation.max-characteristic-authorisation-count": 100
+        },
+        "DISCO_L475VG_IOT01A": {
+            "target.features_add": ["BLE"],
+            "cordio.desired-att-mtu": 200,
+            "cordio.rx-acl-buffer-size": 204
+        },
+        "NRF52840_DK": {
+            "target.features_add": ["BLE"],
+            "cordio.desired-att-mtu": 200,
+            "cordio.rx-acl-buffer-size": 204,
+            "cordio-nordic-ll.wsf-pool-buffer-size": 8192,
+            "cordio-ll.max-acl-size": 204
+        }
+    }
+}

BLE_GattServer_FOTAService/scripts/logging.conf

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+[loggers]
+keys=root,logger
+
+[handlers]
+keys=consoleHandler
+
+[formatters]
+keys=simpleFormatter
+
+[logger_root]
+level=INFO
+handlers=consoleHandler
+
+[logger_logger]
+level=INFO
+handlers=consoleHandler
+qualname=logger
+propagate=0
+
+[handler_consoleHandler]
+class=StreamHandler
+level=INFO
+formatter=simpleFormatter
+args=(sys.stdout,)
+
+[formatter_simpleFormatter]
+format=%(asctime)s - %(name)s - %(levelname)s - %(message)s
+datefmt=