Someone from TPLink said they could reproduce at least some of the issues we are seeing.

@mattsm Another update, besides the ARP issue above on my C320WS the ONVIF services are not running on port 2020. However the rtsp is working (after bypassing the ARP issues)

@Solla-topee So far the person contacting me via email has not made any meaningful progress. Just basic stuff. The gist is the devices with new firmware are not respdoning to arp requests so no other...

@Strickers I can't see how that would help, the info shared here shows the ports don't respond to simple curl requests. Or otherwise xmit/rcv any data on the broken firmware.

@Solla-topee I was just sharing with community. I can't stress enough that having security, baby, etc. cameras broken for so long it's really unacceptable. While I have not thrown mine away, it's...

@Solla-topee someone from tplink emailed me once and I provided the same info as has been provided here. Not further response since the initial email.