A library using Semtech's sx1276/7/8/9's RegRssiWideband register properly to generate random numbers. See this issue for context.
This was written for Sandeep Mistry's library, but is easily adaptable to other platforms.
See ESP32_Random_Test for an example of how it works.
There was a bug in getLoRandomByte(), whereas only even numbers were returned. This bug was pointed out here, for which I am thankful...