ASR6501 for CubeCell

Link between CubeCell Module (HTCC-AB01) and ASR6501.
https://github.com/HelTecAutomation/ASR650x-Arduino

Specs provided on Amazon:

https://www.amazon.com/Heltec-ASR650x-ASR6501-CubeCell-Development/dp/B0813CYL8D

leads to:

https://www.electronicproducts.com/a-look-at-cortex-m0-and-m0-microcontrollers/
https://www.microchip.com/wwwproducts/en/ATSAML21J18B

I also found ASR6501 in a code repository:

https://www.electrodragon.com/w/ASR6501

https://github.com/asrlora/alios-asr-lora/blob/master/board/asr6501/board.h

Talking to someone tells me that since the CubeCell implements I2C in hardware then my I2C issues with getting the public key and 32 byte numbers back are in software.

On page 375 of https://www.microchip.com/wwwproducts/en/ATSAML21J18B:
Support of 100kHz and 400kHz, 1MHz and 3.4MHz I2C mode low system clock frequencies


 Wire.setClock(400000);