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Connecting an LG Monitor to a Windows PC Trigger the Silent, Unprompted Installation of Adware
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You can do this with some firewalls, switches, and access points. Opnsense has timed firewall capabilities.
I have one on a schedule here for my TV. I can also toggle it from my phone.
I know but I mean a literal 1 in 1 out female-female Ethernet box that is triggered by a dumb remote. I err on the side of dumber is better.
Dumb switch on a smart plug.