xmodem protocol in java

Question

Hi, i'm implementing x modem protocol for reciveing file form external device using trough serialport using java ,i'm getting 133 bytes from sender after sending C to sender then i'll get 133 bytes i'e first packet afetrthat i've to send acklowledgment i have done that part but i'm not getting second packet and i've sent ack within timeout period only then also i'm not getting the second packet,plz help me to find the problem.

thanking u in advance,

Answer 1

You might just want to pay for XModem support from http://serialio.com/products/index.php. I have used their SerialPort and it is excellent.