Hi, I am using lwip 1.2.0 under freeRTOS, I am also using PPP + external modem to establish a PPP connection to a server over GPRS.
All works well, provided I can establish a connection to the server and the
connection is closed.
If for some reason the connection is not closed, i.e the TCP/IP stack does not
get to the FIN_2 closing state, all hell breaks loose and my system crashes
when I attempt to re-connect to the server.
I s there an elegant way to remove the connection witout causing future failure.
To connect I use:
conn = netconn_new(NETCONN_TCP);
netconn_connect(conn, IP, PORT);
vTaskDelay(100); // wait 100ms
Then I check the state of the pcb:
if (conn->pcb.tcp->state == ESTABLISHED)
{
conn->state = NETCONN_CONNECT;
}
else
{
// CloseConnection();
}
void CloseConnection(void)
{
err_count = 4;
while( netconn_close( pxSeverConnectionHandle ) != ERR_OK )
{
if (--err_count == 0) break;
vTaskDelay( 10 );
}
err_count = 4;
err_count = 4;
while( netconn_delete( pxSeverConnectionHandle ) != ERR_OK )
{
if (--err_count == 0) break;
vTaskDelay( 10 );
}
vPortEnterCritical();
pxSeverConnectionHandle = NULL;
vPortExitCritical();
}
What am I doing wrong in my approach that could be causing this problem.
Kind Regards,
Sirjee Rooplall
Figment Design laboratories (Pty) Ltd
mailto: [email protected]
Mobile: +27 (0)83 230 8466
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