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Hello, I got a web app on a local web server. I got devices connected to the same network through Wi-Fi. each device make a login first so I can store the timestamp of the login in mysql table. devices are doing either - log out or - simply get out of the Wi-Fi zone without log out. in the 2nd case I still want to get the time it happens. What do you suggest to get a more or less accurate time of logout? Thanks in advance for help Chris