Block repeat problem with Java XMODEM implementation

Question

I'm implementing XMODEM protocol in Java. In this protocol same block will repeat if packet doesn't match (when I send NAK again and again) but I'm getting it only 5 times.

What might be the problem?

Answer 1

Without any type of sample code it is difficult to determine which is the problem. There is a related post in Implementation of X-Modem protocol in Java with some sample code in it.