What is A0 in example code of Softserial of RAK4631 on RAK5005

Tutorials
1

I’m trying to use two UART to control two different modules. I have problem finding the corresponding ports.
What is A0,1,2,3 in example code of Softserial of RAK4631 on RAK5005? Which are the corresponding port on PAK5005? Is it possible to use port IO1 and IO2 on RAK5005 as softserial?

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Welcome to the forum @Hjh

What SoftSerial example or library are you referring to? There is no A0/A1/A2/A3 pins with RAKwireless WisBlock modules.

You can use IO1, but IO2 might cause problems because it has a secondary function to switch on/off the power for sensor and IO modules.

Why do you need a SoftwareSerial, there is a full hardware serial available on the RAK5005-O pin header ==> RAK5005-O WisBlock Base Board Datasheet