Hi all!
I'm working with FreeRTOS v7.0.1 and LwIP 1.4.0 on a Freescale Kinetis K60.
In my application, I need to listen to three different TCP ports. There are
three
different devices that are supposed to connect to the one Im devoloping, and
I would like them to connect to three different listening ports.
In a past thread of this list called "Multiple connections at the same time
(netconns)",
Gregory had posted:
In other words I must to have
a multiple opened connections waiting for incoming data. Is that true, that I
must to create task for particular connection?
This is my idea (it's working, but uses too much RAM):
// - Server task -----------------------------------
void server(void *parameters)
{
struct netconn *conn = NULL;
struct netconn *newconn = NULL;
conn = netconn_new(NETCONN_TCP);
netconn_bind(conn, NULL, 502);
netconn_listen(conn);
for (;;)
{
newconn = netconn_accept(conn);
// creating new task
xTaskCreate( serviceTask, "svc", STACK, (void*)newconn, PRIORITY, NULL)
)
}
}
// - Connection service task -----------------------------------
void modbusServiceConn(void *conn)
{
struct netbuf *inbuf = NULL;
uint8_t *data = NULL;
int len;
while (inbuf = netconn_recv(conn))
{
netbuf_data(inbuf, (void *)&data, (void *)&len);
// data processing
netbuf_delete(inbuf);
inbuf = NULL;
}
netconn_delete(conn);
conn = NULL;
vTaskDelete( NULL );
}
Regards,
Gregory
If I run the above code, I can open up to 3 different connection (to same
port).
But, if I try to make a 4th connection to the TCP listening port (502), it
won´t be possible.
So, that´s the first question: Do you know why can't I open more than 3
connections?
On the other hand, I tried to do something different:
I create two different "server" tasks, listening to two different TCP ports
(let´s say 502 and 503).
Then, from a TCP client application I connected to 502 port, and also to
503 port.
But then, when I tried to open a 3rd connection, to one of those two ports,
I would get rejected..
Why is that happening? Is there anything I can´t see?
My settings in lwipopts.h are:
#define MEMP_NUM_TCP_PCB 6
#define MEMP_NUM_TCP_PCB_LISTEN 6
And part of my firmware code is:
void tcp_Task( void *pvParameters )
{
err_t error;
uint16 *tcpListenPort;
struct netconn *conn = NULL;
struct netconn *newconn = NULL;
tcpListenPort = (uint16*) pvParameters;
conn = netconn_new(NETCONN_TCP);
if( netconn_bind(conn,IP_ADDR_ANY,(uint16)tcpListenPort) != ERR_OK )
{
vTaskDelete(NULL);
}
netconn_listen(conn);
for (;;)
{
/* waiting for connection from client */
error = netconn_accept(conn,&newconn);
if(error==ERR_OK)
{
// creating new task
sys_thread_new( ( char * ) "svc", serviceTask, (void *)newconn,
350,tskIDLE_PRIORITY + 2 );
}
}
}
void serviceTask (void *conn)
{
struct netbuf *inbuf = NULL;
err_t error;
while( (error = netconn_recv(conn,&inbuf)) == 0 )
{
//RX Data Handling
}
netconn_delete(conn);
conn = NULL;
vTaskDelete( NULL );
}
Thank you!
Regards,
Rodrigo G.
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