add initial IOT project

IOT/.gitignore

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+.pio
+.vscode/*
+
+secrets.ini

IOT/config.ini

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+; Project configuration file
+
+[config]
+; Hardware Serial baud rate
+; Also available in the code as `MONITOR_SPEED`
+monitor_speed = 115200
+
+; Software Config
+; note: additionnal flags are added by Platform.io (see total amount in `.vscode/c_cpp_properties.json` in the `defines` section)
+; notworthy ones:
+; __PLATFORMIO_BUILD_DEBUG__ = debug mode
+build_flags =
+; DO NOT TOUCH --- START
+    -D MONITOR_SPEED=${config.monitor_speed}
+; DO NOT TOUCH --- END
+
+    -D EXAMPLE_NUMBER=69
+
+    -D EXAMPLE_STRING=\"Pouet\"

IOT/envs.ini

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+; Add additionnal environments in this file
+
+; Default production environment
+[env:prod]
+
+; Debug environemnt
+[env:debug]
+build_type = debug
+
+
+; Example additionnal env
+; [env:example]
+; ; note: keep the `${env.build_flags}` to includes others build flags
+; build_flags = ${env.build_flags}
+;     -D POUET

IOT/include/README

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+
+This directory is intended for project header files.
+
+A header file is a file containing C declarations and macro definitions
+to be shared between several project source files. You request the use of a
+header file in your project source file (C, C++, etc) located in `src` folder
+by including it, with the C preprocessing directive `#include'.
+
+```src/main.c
+
+#include "header.h"
+
+int main (void)
+{
+ ...
+}
+```
+
+Including a header file produces the same results as copying the header file
+into each source file that needs it. Such copying would be time-consuming
+and error-prone. With a header file, the related declarations appear
+in only one place. If they need to be changed, they can be changed in one
+place, and programs that include the header file will automatically use the
+new version when next recompiled. The header file eliminates the labor of
+finding and changing all the copies as well as the risk that a failure to
+find one copy will result in inconsistencies within a program.
+
+In C, the usual convention is to give header files names that end with `.h'.
+It is most portable to use only letters, digits, dashes, and underscores in
+header file names, and at most one dot.
+
+Read more about using header files in official GCC documentation:
+
+* Include Syntax
+* Include Operation
+* Once-Only Headers
+* Computed Includes
+
+https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html

IOT/lib/README

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+
+This directory is intended for project specific (private) libraries.
+PlatformIO will compile them to static libraries and link into executable file.
+
+The source code of each library should be placed in a an own separate directory
+("lib/your_library_name/[here are source files]").
+
+For example, see a structure of the following two libraries `Foo` and `Bar`:
+
+|--lib
+|  |
+|  |--Bar
+|  |  |--docs
+|  |  |--examples
+|  |  |--src
+|  |     |- Bar.c
+|  |     |- Bar.h
+|  |  |- library.json (optional, custom build options, etc) https://docs.platformio.org/page/librarymanager/config.html
+|  |
+|  |--Foo
+|  |  |- Foo.c
+|  |  |- Foo.h
+|  |
+|  |- README --> THIS FILE
+|
+|- platformio.ini
+|--src
+   |- main.c
+
+and a contents of `src/main.c`:
+```
+#include <Foo.h>
+#include <Bar.h>
+
+int main (void)
+{
+  ...
+}
+
+```
+
+PlatformIO Library Dependency Finder will find automatically dependent
+libraries scanning project source files.
+
+More information about PlatformIO Library Dependency Finder
+- https://docs.platformio.org/page/librarymanager/ldf.html

IOT/platformio.ini

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+; PlatformIO Project Configuration File
+
+; Additionnal files
+; `secrets.ini`: Secret Build Flags that will be ignored in git (content: `[secrets]\nbuild_flags = `)
+; `envs.ini`:    Build environments
+
+; Defaults
+[secrets]
+build_flags =
+
+[platformio]
+default_envs = debug
+extra_configs =
+    secrets.ini
+    config.ini
+    envs.ini
+
+[env]
+; build Envs
+build_flags = ${config.build_flags} ${secrets.build_flags}
+
+; Device Settings
+platform = atmelavr
+board = megaatmega2560
+framework = arduino
+
+; Monitoring settings
+monitor_speed = ${config.monitor_speed}
+; note: make sure to rebuild after changing it (log2file add a .log file containing the monitor logs)
+monitor_filters = esp32_exception_decoder, default ;, log2file
+monitor_flags =
+    --echo
+
+; upload settings
+; upload_port = COM1
+
+; librairies
+lib_deps =
+;    example:
+;    erropix/ESP32 AnalogWrite@^0.2
+
+; Checker settings
+check_tool = clangtidy, cppcheck
+check_patterns =
+    src/
+    include/
+    lib/
+check_skip_packages = yes
+check_flags =
+    clangtidy: --checks=abseil-*,boost-*,bugprone-*,cert-*,cppcoreguidelines-*,clang-analyzer-*,google-*,hicpp-*,modernize-*,performance-*,portability-*,readability-*,-cppcoreguidelines-avoid-non-const-global-variables,-cppcoreguidelines-owning-memory,-modernize-use-trailing-return-type,-cppcoreguidelines-init-variables
+    cppcheck: --project=config.cppcheck

IOT/secrets.ini.example

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+; Add secrets token/logins/etc `secrets.ini`
+; Add the sames values as blank in `secrets.ini.example
+; To be able to reproduce it
+
+[secrets]
+build_flags =

IOT/src/main.cpp

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+#include <Arduino.h>
+
+void setup() {
+  // put your setup code here, to run once:
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+}

IOT/test/README

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+
+This directory is intended for PlatformIO Test Runner and project tests.
+
+Unit Testing is a software testing method by which individual units of
+source code, sets of one or more MCU program modules together with associated
+control data, usage procedures, and operating procedures, are tested to
+determine whether they are fit for use. Unit testing finds problems early
+in the development cycle.
+
+More information about PlatformIO Unit Testing:
+- https://docs.platformio.org/en/latest/advanced/unit-testing/index.html