Got it! Thank you!

Hi Just add HardwareSerial Serial2(2); under #include <Arduino.h> in /Users/matthias/Documents/Arduino/libraries/M5Stack/src/LoRaWan.h

So, I have 2 m5stack core with me. My idea is to have these 2(or potentially more) to communicate with each other via LoRa, one to be a sensor node, and another acts as a receiver. The receiving node will then upload the data received from the sensing node to thingspeak. The components used in this system is the ENV sensor, and the LoRa modules. I hope this explains what I am trying to do.

most M5Stack Arduino API , you can find it from this page. link:https://docs.m5stack.com/#/en/arduino/arduino_api

Does anyone know how to 'redirect' the UART on Pin 17 for sending to Pin 9. This since the IR-Led on the M5StickC and others within the M5-Family is build connected to Pin 9. It would be interesting to have that light use the irDA protocol, since it is already available inside it.