I'm having a project of transmitting and receiving JPEG image wirelessly using xbee module. I have successfully transmitted and received few bytes on test but when I transmitted whole JPEG file I had a problem. Sometime, few bytes of JPEG file was missing, then the image can not be shown correctly or sometime cannot be shown totally. I try to find away to recover the file but still don't figure it out. Please give me some suggestions. Thanks a lot.
My system include: PC->Arduino2560->Xbee ~~> Xbee->Arduino2560->PC.

 

Generate a CRC for each 1K block.
Transmit back the received CRC + test if CRC does match (on receiver side).
Retransmit 1K block if needed.