Hi Sylvain,
it must happen before it goes to PPP. If there would be issues in the serial stream (causing lost data), the sequence number of the next unbroken fragment would be wrong. As the sequence numbers in the "lost fragment" variant are perfect, I assume it must happen before LwIP assigns the sequence numbers. It can't really happen, are you sure your serial output function is blocking until all data are sent (or buffered in a fifo) ? Sylvain
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