I found one problem. I have called lwip_init() function instead of tcpip_init(). This was obviously wrong and in this case the thread tcpip_thread wasn't created. Now this is fixed. Nevertheless, the behavior is still the same. Here is also a Wireshark log for a better explanation what is going wrong: log.pcapng <http://lwip.100.n7.nabble.com/file/t1647/log.pcapng> . It can be seen that my device which has an IP address 192.168.10.2 send an ACK package, but it doesn't send his FIN package as it is expected. Any idea why?
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