Hello,
I have got issue with TCP server disconnection.
Version: lwip-2.1.2
Code: Pattern I am working with:
/* TCP connection setup */
struct netconn *conn, *newconn;
err_t err = ERR_OK;
conn = netconn_new( NETCONN_TCP );
err = netconn_bind( conn, &ipAddr, tcpPort );
netconn_listen( conn );
for( ;; )
{
/* Grab new connection */
err = netconn_accept(conn, &newconn);
/* Process the new connection */
if (err == ERR_OK)
{
while ( err == ERR_OK )
{
struct netbuf *rxBuf = NULL;
err = netconn_recv( newconn, &rxBuf );
/* Continuously get data requests from TCP Client and send
response */
do
{
/* Get data from netbuf */
netbuf_data(rxBuf, &requestReceived, &reqLength);
/* Prepare transmit buffer */
struct netbuf* txBuf;
txBuf = netbuf_new();
(void)netbuf_alloc( txBuf, MB_MAX_MESSAGE_LENGTH );
/* Analyze request and prepare response
*
*/
err = netconn_write( newconn, txBuf->p->payload,
rspLength, NETCONN_COPY );
/* Delete transmit buffer */
netbuf_delete( txBuf );
}
while ( ( err == ERR_OK ) && (netbuf_next( rxBuf ) >= 0 ) );
/* Delete receive buffer */
netbuf_delete( rxBuf );
}
}
if ( newconn != NULL )
{
netconn_close( newconn );
netconn_delete( newconn );
}
vTaskDelay( pdMS_TO_TICKS( TRY_RECONNECT_TIME ) );
}
Server app (lwip) is a part of embedded system.
TCP Client Test application is running on my PC.
There are 2 ways of disconnection which I have tested:
CASE 1. Turn off Client application (cable between my PC and embedded
system remain connected).
Registered errors:
ERR_CONN/** Not connected. */ or
ERR_RST/** Connection reset. */ or
ERR_CLSD/** Connection closed. */
Resources were properly freed. In lwip_stats.memp[0] (MEMP_TCP_PCB)) was
decreased by 1.
I can make new connection by run Client application on PC and connection
is being established. Everything works fine.
CASE 2. Disconnect eth cable by removing RJ45 connector.
Registered errors:
ERR_RTE/** Routing problem. */
Resources WERE NOT properly freed. In lwip_stats.memp[0] (MEMP_TCP_PCB))
is on the same level as before cable disconnection. I can make new
connection but number of used resources is increasing every time new
connection is being established.
How can I handle cable disconnection to achieve resource release as in
case 1?
Have you had similar issues?
Best Regards,
Michał Timm
WB Electronics S.A.
05-850 Ozarow Mazowiecki, ul. Poznanska 129/133
NIP: 526-216-83-87 REGON: 0128903491 KRS: 0000369722 W.K.Z.: 516 616,35 PLN
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