The RX of a BLE device needs to be on to wake it up via BLE?
So there's any way to wake him up from sleep mode via BLE?


Just start advertizing with a long period.

This way you need the high TX/RX current only for a very short time about once per second or even less often, which means your device is >99% in the low power sleeping state. Average current consumtion could go down to double digit µA range, but YMMV.