@Cirpaciu 

Hi,
If the Tapo C310 displays offline in the Tapo app at all times, you can try the following steps:
  1. Ensure your router is working.
  2. Press and hold the reset button on the camera for 10 seconds to factory reset it. Wait for two minutes.
  3. If the LED is flashing red and green, try to reconfigure the camera to make it work.
      How to set up the Tapo camera
 

If you have any other concerns, please provide a detailed description of the phenomenon you are experiencing so we can assist you further.

Best Regards