[lwip-users] PCB states stay in FIN_WAIT_1

[Theou Jean-Baptiste]

Hello everyone,

I've a problem with lwIP (1.3.2 on atmel) on TCP/IP transmission. I use lwIP in FreeRTOS. 
In my project, web interface make an request (every 2 sec approx. ) to http server (who is on my embedded system) via http://192.168.0.120/CONFIG?blabla.

Everything thing ok but after a while (seems random), request doesn't have answer anymore. 

With lwIP TCPDEBUG, i've this message (via RS-232) :

tcp_slowtmr: tcp state  -> ESTABLISHED
tcp_slowtmr: tcp state  -> ESTABLISHED


tcp_slowtmr: tcp state  -> ESTABLISHED
tcp_slowtmr: tcp state  -> ESTABLISHED

tcp_slowtmr: tcp state  -> ESTABLISHED

tcp_slowtmr: tcp state  -> ESTABLISHED

tcp_slowtmr: tcp state  -> ESTABLISHED
tcp_slowtmr: tcp state  -> ESTABLISHED


tcp_slowtmr: tcp state  -> ESTABLISHED

tcp_slowtmr: tcp state  -> FIN_WAIT_1


tcp_slowtmr: tcp state  -> FIN_WAIT_1
tcp_slowtmr: tcp state  -> FIN_WAIT_1


tcp_slowtmr: tcp state  -> FIN_WAIT_1
tcp_slowtmr: tcp state  -> FIN_WAIT_1


[......]

tcp state seems lock on FIN_WAIT_1, like if PC doesn't send FIN_WAIT_2 ....

For create my TCP connection, i used this way : 

netconn_accept -> netconn_close -> netconn_delete

Have you any idea ? 

Best regards

-- 
Jean-Baptiste Théou