Yes for known endpoints like a security camera Static IP address is essential to avoid confusion of what IP is assigned. DHCP reservation is not adequate, please implement STATIC IP for camera.

@Edison_UK Managed to get App to work by hard rebooting my i-PAD and can see devices (4) again, here is H/W and F/W version just for info :

I have four TP P100 power plugs which are still working fine with a scheduled sequence of OFF/ON. However after updating Tapo TP-LINK app from apple store via normal "Update" on August 29th,...