STK500 protocol - Command Sequence


hi all,

i trying figure out sequence of stk500 commands program arduino.

i have hex file stored on sd card , have processor read hex file , burn arduino using standard bootloader.

i have had through commands in protocol:
http://www.atmel.com/images/doc2525.pdf

and have seen python implementation of programming side:
https://translate.google.com/translate?hl=en&sl=es&tl=en&u=http%3a%2f%2fwww.sistemasorp.es%2f2014%2f11%2f11%2fprogramando-un-arduino-remotamente-con-el-modulo-esp8266%2f

but don't have clear idea of minimum required message flow program arduino.

if point me towards appropriate documentation, or explain me required implement programmer great.

cheers,
-steve

p.s - also, i'd interested in doing samd21 bootloader on arduino zero. info me started appreciated.

i think nick gammon has way program hex file stored on sd slot/card ethernet shield can't seem find that  post ....

:-(



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