service, readme & bug fixes in TX start logic

example.service

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+#
+# NOTICE! Replace PATH_TO_SCRIPT with required directory!
+# Paste content of this file into /etc/systemd/system/YOUR_NAME.service
+#
+
+# Suggested names for service: print-rx.service & print-tx.server
+# REMEMBER to create virtual environment before using script (read README.md) 
+
+[Unit]
+Description=Print Server TX/RX server script.
+After=network.target
+
+[Service]
+User=www-data
+Group=www-data
+WorkingDirectory=PATH_TO_SCRIPT
+ExecStart=PATH_TO_SCRIPT/.venv/bin/gunicorn wsgi_back:app -c gunicorn.py
+
+[Install]
+WantedBy=multi-user.target