Can also pass NULL to use the default pin assignments (digital pins 0-7 on Adafruit Metro Express or Arduino Zero): Adafruit_NeoPXL8 strip(NUM_LED, NULL, NEO_GRB); The first argument, strand length, ...

Why not! RadioLib natively supports Arduino, but can run in non-Arduino environments as well! See this Wiki page and examples/NonArduino. RadioLib was originally created as a driver for RadioShield, ...