Add usage command and allow running the emulator with no serial conne… #30

	#!/usr/bin/env python3
	# -- coding: utf-8 --
	###########################################################################
	# ELM327-emulator
	# ELM327 Emulator for testing software interfacing OBDII via ELM327 adapter
	# https://github.com/Ircama/ELM327-emulator
	# (C) Ircama 2021 - CC-BY-NC-SA-4.0
	###########################################################################

	name: Upload ELM327-emulator Package to PyPI and TestPyPI

	#on:
	# release:
	# types: [created]

	#on: [push]

	on:
	push:
	tags:
	- 'v*'

	jobs:
	build-n-publish:
	name: Build and publish Python to PyPI and TestPyPI
	runs-on: ubuntu-latest

	# Checking out the project and building distributions
	steps:
	- uses: actions/checkout@v3
	- name: Set up Python
	uses: actions/setup-python@v5
	with:
	python-version: '3.x'
	# This will download your repository into the CI runner and then install and activate Python

	- name: Upgrade pip
	run: pip install --upgrade pip

	- name: Install build dependencies
	run: pip install setuptools wheel twine build

	- name: Build the package
	run: python -m build

	- name: Publish to PyPI
	env:
	TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
	TWINE_PASSWORD: ${{ secrets.PYPI_PASSWORD }}
	run: \|
	twine upload --repository pypi dist/*.tar.gz --verbose

	- name: Publish to TestPyPI
	env:
	TWINE_USERNAME: ${{ secrets.PYPI_USERNAME }}
	TWINE_PASSWORD: ${{ secrets.TEST_PYPI_API_TOKEN }}
	run: \|
	twine upload --repository testpypi dist/*.tar.gz --verbose

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