To bump up the connection and also avoid sloppy Wifi rates around my flat I went a bit further than just buying a cheap switch and got a 16 port managed switch, the Netgear GS716T-300EUS Smart Managed Switch.
Downside of the cheap Netgear device is that the management software is only available for Microsoft Windows, not for Linux or MacOSX. However, web configuration is possible and everything important should be available via the web interface.
Next I Installed Nagios which was not that easy as the primary hints on how to do it via homebrew were wrong/bad. I found an older instruction which helped me to get there. The switch was now able to tell me via SNMP that the intended ports were up and how long it was turned on so far.