Possible this is the cause, you can test it in any browser to see if one of these works or if both do…
ip/Streaming/channels/301/picture
ip/ISAPI/Streaming/channels/301/picture
If there is an issue please let me know as I would prefer newer cameras work and older ones have to override.
This config line can be used to override. Replace the 3 with the NVR channel or if you setup the NVR to use separate ports for each camera it will need to be a 101 in that case. I don’t have an NVR so have not tested a lot of this functionality.
SNAPSHOT_URL_OVERRIDE="/ISAPI/Streaming/channels/301/picture"
For an example httponly thing file this link should be best until I update the examples in the readme…
https://community.openhab.org/t/diy-digital-doorbell-peephole-camera/76417/8
The snapshot url is very important as that is how the camera comes ONLINE, if you give a rtsp link instead of a jpg snapshot url it will fail and not come online. Perhaps I should reconsider this? At the time I thought that all cameras could do a snapshot.
The SERVER_PORT is also important to enable the serving of files on a port of your choice.