update docs

README.md

@@ -1,18 +1,23 @@
 # Receipt Printer
 
-This software is designed to run on a debian based system and acts as a middle-man between the EZ LAN Manager database and the USB interface of the receipt printer.
+This software is designed to run on a debian based system and acts as a middle-man between the EZGG LAN Manager database and the USB interface of the receipt printer.
 
 # Notes
 
 - Does only work on Linux
-- Needs root privileges or udev config to work
-- Designed to run alone on a Raspberry Pi
 - Not meant to be exposed to the internet, local deployment only
-- For EZ LAN Manager configuration, check README in that repo
+- For EZGG LAN Manager configuration, check README in that repo
 
 # Deploy
 
 1. Configure password and port in `main.py`
 2. Make sure USB printer is connected to device
-3. Install requirements with sudo
-4. Run `main.py` with sudo
+3. Install requirements in venv
+4. Adapt `receipt-printer.service` as needed and move to `~/.config/systemd/user`
+5. Enable unit in systemd:
+```sh
+systemctl --user daemon-reexec
+systemctl --user daemon-reload
+systemctl --user enable receipt-printer
+systemctl --user start receipt-printer
+```

receipt-printer.service

@@ -0,0 +1,14 @@
+[Unit]
+Description=Receipt Printer
+After=network.target
+
+[Service]
+WorkingDirectory=/opt/ReceiptPrinter
+ExecStart=/opt/ReceiptPrinter/printer-venv/bin/python main.py
+Restart=always
+RestartSec=3
+
+Environment=PYTHONUNBUFFERED=1
+
+[Install]
+WantedBy=default.target