For some reason, my DTV looses its connection to Rommie. To restore, I need to add the DTV device all over again and create a new identical activity to the old. It would be faster if I can take the old activity and delete or change the device to the new one I just loaded. Is this possible?
It’s not possible currently to swap a device for another device to take over existing commands.
However, it sounds like what is happening to you is DHCP address changes which are much more easily fixed by creating a DHCP Reservation: