Try something like this (as a test, not a proposed solution):
err_t myrecv(void *arg, struct tcp_pcb* pcb, struct pbuf *p, err_t err)
{
if ((p == NULL) || (err != ERR_OK)){
call to tcp_close()
return ERR_OK;
}
tcp_recved(pcb, p->tot_len);
pbuf_free(p);
do your stuff but do not call tcp_close()
return ERR_OK;
And see what happens.
Are you running 1.4.1 (where did you get it from ?) or git head ?
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