Hello, everyone.
My English is poor?? so the description may not be clear enough.
The modbus tcp with lwip in STM32F4??always show timeout, when communication
with modbus poll.
And the case is:
(1)the version of lwip is 1.3.2
(2)#defien TCP_TMR_INTERVAL 10
(3)no system, #define NO_SYS 1
(4)#define MEM_ALIGNMENT 4
(5)#define MEM_SIZE (12*1024)
(6)#define MEMP_NUM_PBUF 10
(7)#define MEMP_NUM_UDP_PCB 5
(8)#define MEMP_NUM_TCP_PCB 2
(9)#define MEMP_NUM_TCP_PCB_LISTEN 2
(10)#define MEMP_NUM_TCP_SEG 20
(11)#define MEMP_NUM_SYS_TIMEOUT 3
(12)#define PBUF_POOL_SIZE 10
(13)#define PBUF_POOL_BUFSIZE 1600
(14)#define LWIP_TCP 1
(15)#define TCP_TTL 255
(16)#define TCP_QUEUE_OOSEQ 0
(17)#define TCP_MSS (1500 - 40)
(18)#define TCP_SND_BUF (8*TCP_MSS)
(19)#define TCP_SND_QUEUELEN (4* TCP_SND_BUF/TCP_MSS)
(20)#define TCP_WND (4*TCP_MSS)
(21)#define LWIP_ICMP 1
(22)#define LWIP_DHCP 1
(23)#define LWIP_UDP 1
(24)#define UDP_TTL 255
(25)#define LWIP_STATS 0
(26)#define LWIP_PROVIDE_ERRNO 1
(27)#define LWIP_NETCONN 0
(28)#define LWIP_SOCKET 0
I have changed the value of these parameters, but it seems unuseful.
I want to know what is the reason for timeout. It is inappropriate
configurations, or something else?
I am confused, please help me.
Thank you??
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