[sdiy] Simple MIDI Seq for firmware updates

[MTG]

I'm working on a bootloader of sorts to allow me to update the firmware of a 
new MIDI device.  Because of the CPU architecture and memory constraints I 
have to send realtively small blocks.  I've done this before over RS232 with 
my own "updater" but not over MIDI. My own updater worked by loading the 
whole firmware image into PC memory then sending the blocks over one-by-one.

So my choices are to learn the MIDI API and write my own "updater" program 
or look at how other people do it. It seems that .MID files are popular when 
you can't send the whole firmware over in one chunk. I don't see how I can 
do the individual blocks with SysEx (E.g. MIDI-OX) because there would 
probably be a handshake of sorts after each block. So can anyone recommend a 
SIMPLE sequencer that allows me to see the MIDI file data at a level that 
would allow me to understand how to create my own .MID files for the purpose 
of firmware updating?

Or am I missing something really obvious?

GB