E32-900T20D Lora repeater settings

I am making a low power repeater using a 3.3v arduino and E32-900T20D module. All I want repeater to do is receive any sent message, then resend it. I will have this device with bigger antenna mounted on roof for maximum line of sight. What is best setting for this use case? Fixed or transparent? I don't quite understand the high and low address bits... do they need to be set when using transparent? Thanks! The libraries provided have been very helpful for interfacing these modules. I am successfully able to send and receive messages between pi pico with micropython module and ATMEGA328P with arduino library.