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Google offers one free virtual machine on Google Cloud Platform. This script will make setting up a UniFi Controller on GCP a breeze and it includes all the goodies. No command line required, everything is done in the GCP Console and it takes 15 minutes total and that includes transferring your current sites to the cloud. You should try this!
Roaming or switching from one access point to the next is a common source of confusion. Technically Wi-Fi roaming is the opposite of the cellular network. Wi-Fi access points are passive and the client devices choose which access point they want to use and when to switch, if they switch. What are the consequences?