RAK3272S Digital I/O's

https://docs.rakwireless.com/product-categories/wisduo/rak3272s-breakout-board/quickstart/#how-to-use-digital-io

Pin Name	J Connector pin
PA4	J5 pin 4
PA5	J5 pin 3
PA6	J5 pin 2
PA7	J5 pin 1
PA8	J4 pin 1
PA9	J4 pin 2
PB6	J5 pin 5
PB7	J5 pin 6

void setup()
{
  pinMode(PA7, OUTPUT); //Change the P0_04 to any digital pin you want. Also, you can set this to INPUT or OUTPUT
}

void loop()
{
  digitalWrite(PA7,HIGH); //Change the PA0 to any digital pin you want. Also, you can set this to HIGH or LOW state.
  delay(1000); // delay for 1 second
  digitalWrite(PA7,LOW); //Change the PA0 to any digital pin you want. Also, you can set this to HIGH or LOW state.
  delay(1000); // delay for 1 second
}