Nest cam setup and getting your Nest camera back online depends on what has taken your Nest camera offline. If the issue is one of power, replace the battery with a fully charged battery, and doing so will restore the camera immediately, assuming no other issues persist. If the issue is a network connection, adjust your router to be closer. You should also ensure that your camera properly connects to your network regardless of distance. Should the problem rest with the Nest servers, all you can do is wait. Once Nest’s services are restored, your camera should once again work correctly.