yes, the optiboot commands are well defined, and i have already seen the list:
(supported)
STK_LOAD_ADDRESS
STK_PROG_PAGE
STK_READ_PAGE
STK_READ_SIGN
STK_LEAVE_PROGMODE
STK_GET_PARAMETER
(harmlessly ignored)
STK_UNIVERSAL
STK_SET_DEVICE
STK_SET_DEVICE_EXT
(from: HowOptibootWorks · Optiboot/optiboot Wiki · GitHub)
what i am interested in is hearing about what commands other arduino bootloaders require to be issued for correct operation. indeed, is there any definitive list of bootloaders that have commonly been loaded into shipped arduinos?
cheers,
rob 