TCP or UDP?

i'm working on remote console communicates through arduino ethernet shield through ethernet computer controls autonomous underwater vehicle.

the software on computer mentioned. i'll using duemilanove communicate computer. send commands , receive updated status reports.

right i'm doing heavy research on protocol should using communication. tcp way go or should udp?

where find more information on subject/idea? projects out there similar have in mind at?

thanks!

i don't know shields capabilities, depends on doing. if doing time critical example: if don't data on time span not needed anymore ex. 500 ms. if transferring data going collect on  file , upload, use tcp.

for can see on case, use udp. use udp real time data acquisition self nmea , dpt strings example, because use software on topside use data real time.

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