Add extras and build scripts

build/arduino.avr.uno/extras/ser2net.conf

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+# /etc/ser2net.conf
+# This file is part of the source device.
+
+2000:raw:600:/dev/ttyACM0:9600 8DATABITS NONE 1STOPBIT

build/arduino.avr.uno/extras/socat-remote.service

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+# This file is part of the Home Assistant server.
+
+[Unit]
+Description=Socat bridge to ser2net
+After=wg-quick@wg0.service
+Requires=wg-quick@wg0.service
+
+[Service]
+Type=simple
+StandardOutput=syslog
+StandardError=syslog
+SyslogIdentifier=socat-bridge
+
+ExecStartPre=/usr/bin/rm -rf /dev/ttyV0
+ExecStart=/usr/bin/socat pty,link=/dev/ttyV0,waitslave tcp:10.10.0.2:2000
+Restart=always
+
+[Install]
+WantedBy=multi-user.target

build/arduino.avr.uno/scripts/flash.sh

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+#!/bin/bash
+
+# Stop ser2net to free serial port
+service ser2net stop
+
+# Flash the firmware
+avrdude -v -p m328p -F -P /dev/serial/by-id/usb-Arduino__www.arduino.cc__0043_95032303837351D02141-if00 -c arduino -D -U flash:w:../vremenska-postaja.ino.hex:i
+
+# Start ser2net
+service ser2net start