Add support for Bluetooth (classic, BT) on ESP32 (Android only).
This need an up-to-date ESP32 library, if not it will not compile.
I did not make use of BluetoothSerial, due to the lack of onConnect, onDisconnect and Txpower functionality. By handling connect/disconnect nicely, Blynk always keeps working perfectly without sync-problems when going out-of-range and coming back. Remark that this needs Android app 2.26.7, as in 2.26.6 there is a bug in the Bluetooth implementation (I checked with a development version, in which Bluetooth issues are solved).
Description
Add support for Bluetooth (classic, BT) on ESP32 (Android only). This need an up-to-date ESP32 library, if not it will not compile.
I did not make use of BluetoothSerial, due to the lack of onConnect, onDisconnect and Txpower functionality. By handling connect/disconnect nicely, Blynk always keeps working perfectly without sync-problems when going out-of-range and coming back. Remark that this needs Android app 2.26.7, as in 2.26.6 there is a bug in the Bluetooth implementation (I checked with a development version, in which Bluetooth issues are solved).