Bluetooth had networking already in the early days (PAN).
Still there on android phones.
It's so terribly slow it's almost unusable, but does seem to be substantiality more power efficient than running a WiFi hotspot all the time.
alt Hacker News
Still there on android phones.
It's so terribly slow it's almost unusable, but does seem to be substantiality more power efficient than running a WiFi hotspot all the time.