The common thing is that the device creates its own WiFi network that the phone connects to and then sends it the ssid and pw it needs. Which is a shame given how zeroconf was designed to solve this problem 20 years ago.
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Are they nominally Bluetooth3+HS? This is a version of BT that uses BT discovery (ie can find your phone) but can then switch to WiFi for bulk data transfer. https://en.wikipedia.org/wiki/Bluetooth#Bluetooth_3.0_+_HS …
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No but this is cool
End of conversation
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I have a security camera where their phone app sends a series of audio tones that the camera's microphone picks up to set the wifi network.
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Probably mDNS, if you're on Linux, give avahi a try
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