Here is a solution #include <BluetoothSerial.h> #if !defined(CONFIG_BT_ENABLED) || !defined(CONFIG_BLUEDROID_ENABLED) #error Bluetooth is not enabled! Please run `make menuconfig` to and enable it #endif BluetoothSerial SerialBT; #define BT_DISCOVER_TIME 10000 static bool btScanAsync = true; static...