Hi. I'm currently porting some code from Stellaris to Tiva which uses LWIP and HTTPD, but I seem to be getting packet fragmentation (On both platforms) and I was hoping someone would be able to give me some pointers.
I request a '.cgi' file from the micro, which replies with an SSI with tags. It works except that the reply (which is only 460bytes) get split into three blocks.
If I decrease the size of TCP_MSS in lwipopts.h then I can make it fragment into more blocks, but no matter how big I make TCP_MSS it always sends three chunks.
After some playing about I did notice that in httpd.c, tcp_write was occasionally returning with ERR_MEM, but I cant seem to find any memory settings in lwipopts.h that stop this.
These are my main lwipopts. They are a bit all over the place because I have been playing with them, but if anyone has some pointers, that would be super!
#define MEM_ALIGNMENT 4
#define MEM_SIZE (8 * 1024)
#define MEMP_NUM_PBUF 16
#define MEMP_NUM_RAW_PCB 16
#define MEMP_NUM_TCP_PCB 8
#define MEMP_NUM_TCP_PCB_LISTEN 8
#define MEMP_NUM_TCP_SEG 32
#define MEMP_NUM_REASSDATA 19
#define MEMP_NUM_SYS_TIMEOUT 10
#define MEMP_NUM_NETCONN 10
#define PBUF_POOL_SIZE 10
#define TCP_MSS 512
#define TCP_WND (2 * TCP_MSS)
#define TCP_QUEUE_OOSEQ 1
#define TCP_CALCULATE_EFF_SEND_MSS 0
#define TCP_SND_BUF (2 * TCP_MSS)
#define TCP_MSL 5000ul
#define TCP_SND_QUEUELEN 24
