Re: [lwip-users] how to handle multiple TCP socket simultaneously

[Mohsin Madki]

and TCP related defines : 

/* ---------- TCP options ---------- */

#define LWIP_TCP                1

#define TCP_TTL                 255

/* Controls if TCP should queue segments that arrive out of

   order. Define to 0 if your device is low on memory. */

#define TCP_QUEUE_OOSEQ         0

/* TCP Maximum segment size. */

#define TCP_MSS                 (1500 - 40)  /* TCP_MSS = (Ethernet MTU - IP header size - TCP header size) */

/* TCP sender buffer space (bytes). */

#define TCP_SND_BUF             (5*TCP_MSS)

/*  TCP_SND_QUEUELEN: TCP sender buffer space (pbufs). This must be at least

  as much as (2 * TCP_SND_BUF/TCP_MSS) for things to work. */

#define TCP_SND_QUEUELEN        (4* TCP_SND_BUF/TCP_MSS)

/* TCP receive window. */

#define TCP_WND                 (2*TCP_MSS)

On Fri, Aug 4, 2017 at 10:10 AM, Mohsin Madki <address@hidden> wrote:

Hi, 

I am using STM32F107 with FreeRTOS+LWIP with Netconn APIs. 

I have created 4 tcp ports (server in listening mode) and trasfers data received to UARTS and viseversa. i.e. Ethernet to Serial converter (4 port). 

I works well for few hours but later it stops working. lwipopts defines are as follows: 

/* ---------- Memory options ---------- */

/* MEM_ALIGNMENT: should be set to the alignment of the CPU for which

   lwIP is compiled. 4 byte alignment -> define MEM_ALIGNMENT to 4, 2

   byte alignment -> define MEM_ALIGNMENT to 2. */

#define MEM_ALIGNMENT           4

/* MEM_SIZE: the size of the heap memory. If the application will send

a lot of data that needs to be copied, this should be set high. */

#define MEM_SIZE                (10*1024)

/* MEMP_NUM_PBUF: the number of memp struct pbufs. If the application

   sends a lot of data out of ROM (or other static memory), this

   should be set high. */

#define MEMP_NUM_PBUF           64 //100

/* MEMP_NUM_UDP_PCB: the number of UDP protocol control blocks. One

   per active UDP "connection". */

#define MEMP_NUM_UDP_PCB        6

/* MEMP_NUM_TCP_PCB: the number of simulatenously active TCP

   connections. */

#define MEMP_NUM_TCP_PCB        10

/* MEMP_NUM_TCP_PCB_LISTEN: the number of listening TCP

   connections. */

#define MEMP_NUM_TCP_PCB_LISTEN 10 //6

/* MEMP_NUM_TCP_SEG: the number of simultaneously queued TCP

   segments. */

#define MEMP_NUM_TCP_SEG        20

/* MEMP_NUM_SYS_TIMEOUT: the number of simulateously active

   timeouts. */

#define MEMP_NUM_SYS_TIMEOUT    10

/* ---------- Pbuf options ---------- */

/* PBUF_POOL_SIZE: the number of buffers in the pbuf pool. */

#define PBUF_POOL_SIZE          12

/* PBUF_POOL_BUFSIZE: the size of each pbuf in the pbuf pool. */

#define PBUF_POOL_BUFSIZE       512

Please suggest if i am missing something. 

Regards,

Mohsin Madki.