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Did those old IP addresses come from the DHCP server in your home router? David

Ok, let me know when you are ready. The wired cameras are connected to the NVR private subnet which is isolated from your LAN. Is the cpe220 in wifi AP mode with the wifi cameras connected to it? What is the IP address of the router connected to the CPE220?

what IP addresses are the wifi cameras using and can you ping them? David

I've setup NVR user accounts (not admin) and used those to stream to streaming services, have you considered YouTube? What bandwidth do you have available on your internet uplink (router WAN to ISP)? Depending on the video resolution you use, 15 users could easily consume that bandwidth.

So you are using SIM cards with public IP addresses to get around CGNAT? Sometimes remote servers do not like clients with excessive variable latency across the network, this is mainly on LEO and GEO stationary satellites but can happen on mobile networks. Have you tried a normal VDSL / FTTP...

Understood, I'm mainly Telecomms / network side. ISP's can do weird things on their networks. Have you checked that the relevant ports are open to the internet? On the router temporarily enable upnp then reboot. Then enable upnp on the NVR, reboot. check connectivity, if it works check the...

Is this related to HikConnect? Export the system logs as a text file and then search for the code. I know you've covered most of these but.... Firmware Update: Ensure that ALL related Hikvision device's firmware are up to date. Check the Hikvision website for the latest firmware version and...

There maybe exception logs on the DVR..... ---------------------------- 46 2023-1-12 0:50:17 ---------------------------- Major Type: Exception Minor Type: IP Camera Disconnected Local User: N/A Host IP Address: N/A Parameter Type: N/A Camera No.: D1 David

as @ahdinko said, 172.32.x.x is outside the private IP address range. Your router is probably configured to block anything outside the private range. You should be able to use a public IP address on a router WAN interface, only use public IP addresses issued by your ISP. David

I've only ever stopped the boot process, did not reflash the firmware. Are you pressing ctrl u or ctrl U?

https://en.wikipedia.org/wiki/RS-485

The UART is usually in the USB converter that you buy, or in the serial port of the device you are using. In the NVR you mention the UART is connected to the RS485 connector. I have 3 USB converters. One is true RS232, the second is serial TTL (3.3Vdc) and the other serial TTL (5Vdc).

Some customised protocols even slice up the hex command strings and reverse them (0xabc = 0xcba). A protocol sniffer can be used to interpret the commands sent and look for the patterns. I think a Dahua PTZ is being used so the command protocol may be in the public domain. In the late 90's we...

Make sure the camera is compatible with the software you will use, be careful what you buy to interconnect everything. I'll help where I can, I'm sure the astronomy forums will be a wealth of information and ready made software. David

I'm familiar with RS232 and have used RS485 and RS422 for data transfer and telemetry. What sort of tracking are you thinking of? David

I wouldn’t trust a backup / restore, wipe the slate clean. Is there a warranty for it?

Andy, I am not familiar with these door cameras. Would it be worthwhile doing a factory reset followed by firmware reload or upgrade or downgrade? I sense that you have two or three small problems giving an overall bigger problem. David

did you fix the door station cameras odd behaviour?

On your web browser clear the cookie cache for that cameras IP address and see if the problems go. I'll read your post again later.

I skimmed through your email problem, I had similar with mine but got there in the end. Aided by creative lateral thinking, a useful skill in the telecom / IT world.