Perfect!
SendArray is working for this 3 commands
to send: as buffer as "on" or as string
That means it already works very well.
I have observed that it is already perfectly implemented in ESP32 BLE_GATT.
these practical send/receive IntArray
but one little thing remains in the App BLE_GATT_SPP:
something very small:
If I send, the TX LED is flashing
but if I receive a byte, the RXLED is not flashing(it's not a problem)