KC868-A2 configure yaml for ESPhome

[elemarek]

B and C in image is SIM800L, you can check pin define on RED pcb, there are lable for pins.
on KC868-A2 PCB SIM800L socket pin define see this photo:

From this it is not entirely clear to me where the output (3)RST_GSM leads. On the board there is only a connection between (3)RST_GSM and (2)RST_GSM? I want to connect this PIN to some free ESP32 IO. Please advise where to make the connection. Thank you.