Here are my quick & dirty test results with original firmware as delivered when I bought the switch last year (Build 20160108 Rel.57851). First of all: you were right, I was wrong. This switch indeed...

Yes, I am in Germany. Where are you from?

Trunk is not an expirement, it's the only way to connect two or more VLAN networks to a third network outside of the TL-SG108E. I will test tomorrow (or better: today, it's already Tuesday here) with...

Should be an Access Point with built-in DHCP server enabled and set up. Give the CPE and the camera a static IP, DHCP is for the wireless clients only.

Since in repeater mode the CPE just repeats a wireless signal from another WiFi router, you only need to connect a cable from the injector's PoE (output) port to the LAN0 PoE (input) port of the CPE...

pleased wrote The only thing I can think of so far is that, when the SG108e transfers a packet to my router "across PVIDs", it does something to the packet to cause the router to send a broadcast in...