LoPy/LoPy4/FiPy SX1272/SX1276 DIO pin connections

[Arjan Mels]

I am trying to use the LoPy (and in future LoPy4) for receiving general RF transmitters (remote controls etc.) and I am struggling to understand how the DIO pins of the SX1272 are connected to the ESP32.

From the pinmap it seems that at least one DIO is connected to GPIO23 called LoRa (Lora/Sigfox) interrupt. Which DIO is this?

Thanks , Arjan