Hi All,
I am facing problem when I connect multiple clients to lwip server.
It works fine for single client.
When I connect multiple clients, after some time I get, tcp_write out of
memory error.
Clients having interframe delay 10ms.
Please suggest me a solution.
My opt.h settings are as below,
#define NO_SYS 1
#define TCP_TMR_INTERVAL 250
#define TCP_SND_BUF 5840
#TCP_MSS 1460
#define MEM_SIZE 64000
#define MEMP_NUM_TCP_PCB 16
#define MEMP_NUM_TCP_PCB_LISTEN 50
#define MEMP_NUM_TCP_SEG 50
#define TCP_WND (4 * TCP_MSS)
#define TCP_SND_QUEUELEN ((4 * (TCP_SND_BUF) +
(TCP_MSS - 1))/(TCP_MSS))
Server code:
signed int prvxMBTCPPortReceive(void *arg, struct tcp_pcb *pxPCB, struct
pbuf *p, signed int Err)
{
unsigned char *pModbusHeader;
u16_t len;
signed int Error;
tcp_nagle_disable(pxPCB);
if( Err != ERR_OK )
{
return Err;
}
if( p == NULL )
// If pbuf is NULL then remote end has closed connection.
{
prvvMBPortReleaseClient( pxPCB );
return ERR_OK;
}
len = p->tot_len;
pModbusHeader = p->payload;
MODTCP1 = ((struct mod_tcp_hdr1 *)pModbusHeader);
Trans_id = MODTCP1->trans_id;
Proto_ID = MODTCP1->proto_id;
Len = MODTCP1->len;
tcp_recved(pxPCB, p->len);
tcp_tmr();
memcpy( Comm3Buff, pModbusHeader + 6, (unsigned short)
*(pModbusHeader + 5) );
ReceiveBuffLength3 = len - 6;
ProcessSerialIntr3();
//pcb->snd_queuelen =0x00;
MODTCP1 = ((struct mod_tcp_hdr1 *)&RxBuff[usTCPBufPos]);
MODTCP1->trans_id = Trans_id;
MODTCP1->proto_id = 0;
MODTCP1->len = htons((unsigned short)(FrameLength3-1));
memcpy( &RxBuff[usTCPBufPos + 6], Comm3Buff, (unsigned short)
(FrameLength3 - 1) );
if( (Error = tcp_write( pxPCB, RxBuff, (unsigned short)
(6+FrameLength3-1), 01 )) == ERR_OK )
{
( void )tcp_output( pxPCB );
//Make sure data gets sent immediately
}
else
{
prvvMBPortReleaseClient( pxPCB );
// Drop the connection in case of an write error.
}
usTCPBufPos = 0;
// Reset the buffer.
pbuf_free( p );
return ERR_OK;
}
Waiting for your reply,
Thanks & Regards,
Kranti Patil,
Embedded Engineer,
REPL | PUNE | INDIA.
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