I can get rtsp url by onvif beidge, but it hard to contact with ip camera, whose guid only obtained by ctrl+click on VMS software. that is inconvenient, is any ways to do this automatically?
The ONVIF Bridge has two parts, the RTSP part which will give streaming video and the ONVIF part which will give you information on the cameras.
Regarding your question,
> is any ways to do this automatically?
If you use MIP SDK and implement it, then you will contact the GUID.