Use QR or NFC to connect to a Bluetooth device?

Hey all, I have people over regularly and am looking for a way for them to easily connect to my outdoor speaker system WITHOUT having to use any external apps like NFC tools or trigger etc.

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I figured I could use a NFC tag or even a QR code that they could scan and somehow be given a prompt to connect their phone to a specified MAC address (BT speakers) I know this is fairly OS specific but has anyone done this without using 3rd party apps?

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Edit: perhaps even an ESP32 with a NFC radio attached that can actively send a connection request?

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TIA!

Submitted by Virtical

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