- Hamradio hobby (Elecraft, ic-7300, aprs, MMDVM, DMR, YSF, CW, home made antennas, openwebrx.
- Electronics + electronics repairing.
- IP-cameras.
- NVR recorders + linux software like Agent DVR.
- Linux computers, linux servers, VPS servers.
- Networks (sdwan, wifi, 5G, firewalls, security).
- Things like: Nginx, php, fastpanel, mysql, phpmyadmin, wordpress, docker, ufw, fail2ban, abuseipdb, wirequard, Casaos.
- Remote controlling things via internet or gsm. Remote control of heating oil burner, sauna, car block heater, car eberspächer/webasto etc.