help for porting snmp!

hi all,
  I want to port a snmp protocol to my project.
  Now I have ported the lwip (a tcp/ip protocol) to my hardware, and it can send and receive udp/tcp data 
correctly. But the lwip haven't supported the snmp. So I want to port a snmp protocol to my project.
  I am studying net-snmp now! I  plan proting partial code of net-snmp to my protocol, but I am dizzy 
because  the codes of the net-snmp are so large.
  Is there anybody can give me some advice? Is my plan reasonable ?
  If yes, where should I begin with? And what should I do ? 
  if no, can you give me a better advice?
  
Thanks! Thanks!
  2006/2/23

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