@Solla-topee 

I just received a new C120, promptly popped in an SD card, and hooked it up. Got it added into the app, no problems and detections/notifications/recordings/playback all work great. No Tapo Care was configured or used.

I figured I would test the ONVIF and RTSP but no luck getting either to work...

I retrieved the IP address from the Tapo app as shown and added the camera user, also as shown. If I read things correctly, it appears the SD card would not allow using ONVIF/RTSP, so I removed the card. Just for sanity, I pinged the camera's IP and that worked. Everything is on the same network subnet, so no issues to contend with there. Everything seemed good to go, so I went on to testing.

For RTSP, I used VLC Media Player, put in the url, rtsp://<camera IP>:554/channel1, opened it, was prompted for username and password, entered that, then opening the stream failed:

VLC is unable to open the MRL 'rtsp://192.168.1.131:554/channel1'. Check the log for details.

I tried the same with 'channel2' URL and had the same results.

Next, I moved into trying ONVIF with DW Spectrum IPVMS. I went to add device, put in camera IP address, username, and password then hit Search. The results were, "No Devices Found". OK, so I moved on to my favorite troubleshooting tool, ONVIF Device Manager. Did a network scan and it pulled in the usual local cameras, but no Tapo C120. I added the camera into ODM manually with URL of 'http://192.168.1.131/onvif/device_service' and when trying to connect, I got the message, "There was no endpoint listening at http://192.168.1.131/onvif/device_service that could accept the message.

I tried turning off and back on the camera user in app settings. Tried deleting and re-adding the camera user. Tried turning off the camera in the app to disconnect any unneeded streams. Tried restarting the camera a few times. No love.

Any suggestions for what to try next?

  @Solla-topee 

the pc must be connected to the same network as the cameras

Update:

I removed camera from app and it reset according to voice prompt. I also did the 10 second reset button reset procedure. Once that was done, I added it back to app and changed nothing else. There was no SD card in the camera at any time after resetting. Still getting the same messages and not able to connect with ONVIF or RTSP.

Update 2:

I figured out the ONVIF to DW Spectrum problem. Default port Spectrum was trying to connect over was 80. Changed that to 2020 and the C120 was discovered immediately. Added camera in with no problem at that point. Pulled in both high and low streams, Spectrum's motion detection works fine, recording good, etc. 2560x1440 high res stream and 640x360 low res stream.

ONVIF Device Manager also works fine now as well using port 2020

Still no RTSP to VLC though. Will fiddle with that some more.

Update 3:

Figured out the VLC issue... the correct URL for RTSP is: 'rtsp://<ip_address>:554/stream1' NOT '.../channel1'. My mistake. I noticed it when looking at the camera properties in DW Spectrum.

All is working as it should now. I can actually stream to VLC, Spectrum, and the Tapo app all at the same time. Sweet.

  @Solla-topee Hi, I have an issue with not being able to stream via RTSP. The camera is C501GW. I have a 4G SIM card in the camera with unlimited data plan and static IP from the network provider with all ports open. Camera account has been set up from the app and APN set to "static" manually (as required from the ISP). So far tried with VLC and Agent DVR, but no luck. I can ping the IP address successfully.

Is the RTSP stream supported with 4G network connection? Anything I could try to do?

TP-link has told us that there will be an update to the app tomorrow on the 14th of december, it will add a toggle to allow us to integrate cameras to dvr's and homeassistant.
This information was shared to the author of Homeassistant-Tapo-Control on github.

Let's all wait and see if they release it tomorrow and if it indeed fixes our issues.

Edit: Actually that's the 13th, today..