switchboard-plug-network
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QR code Wi-Fi sharing
Android 10 added this, but iirc it's standardized somehow. Once you've connected to a Wi-Fi network, you can share that network with others with a QR code.
https://twitter.com/ArtemR/status/1169322099678142464
The plug could generate and display the QR code to make it easier to join other devices to the network.