Also one can learn to use a Raspberry Pi or similar with GPIO as 'programmer' for the EEPROM in 'white label' optics, to make them work in equipment from establ

Also one can learn to use a Raspberry Pi or similar with GPIO as 'programmer' for the EEPROM in 'white label' optics, to make them work in equipment from established brands, which wouldn't work otherwise, because not whitelisted ;-)