"So the camera is connecting to RUT950 wifi and is accessible via mobile connection. Correct?"
Yes that's correct. I can connect via Reolink APP to the camera if I am in RUT WLAN.
"Are you using a public IP address to access the camera remotely?"
No until now it is not possibele to reach the camera via Internet if I am not in the RUT WLAN. Please give me an Instruction how I can reach the camera via internet?
"When RUT950 is configured in wireless station mode (client) and uses harbor Wifi as its WAN coonection, the camera becomes inaccessible".
"If you connect a different device (let's say a phone) to a RUT950 (configured in station mode -> harbor wifi), are you able to access the internet? i.e can other devices on RUT950 LAN access the internet?"
Yes I can connect my iPhone to the RUT WLAN if harbor wifi (SBHMOELLER) is on.
Maybe it is helpfull to describe the complete System: the RUT950 is placed in the boat. Connected is a Raspberry Pi with Home Assistant in a Docker via Ethernet. In Homeassistant I can reach the camera. Both devices and Home Assistant on the boat and my equipment at home are connected via Zerotier Network. The Reolink camera (IP: .....-125) is connected via WLAN to the RUT.
I have made a download of the troubleshoot file and attached it to my original question. You should have a look on 22.12.2022 from 17:05 to 17:20.