I want to start playing with bluetooth connectivity. Are bluetooth modules backwards compatible, i.e. Can the HC-06, HC-05, etc... talk with older iOS devices (Bluetooth 2.1) or would specific modules be needed to communicate with older generation bluetooth devices? Thanks!

Bluetooth module for old iPad connectivity

J-M-L November 14, 2021, 1:06pm 2

HC-05 and the likes implement the SPP profile which has never been supported by Apple
if you want to discuss with iOS devices, go for BLE

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