I am working on my first project using LWIP 1.4.1 and I am having some trouble.
What I need the software to do is to listen on a port for a message from a
remote machine and send a response. After it sends the response it needs to
send a command to the same remote machine and await a response. I have the
first part working fine with the code below. I can listen for a message and
send the response with the code below. The problem is with the second part,
having the system then send a command to the remote system and wait for a
response. If I simply generate the command and send it right after the initial
response the remote system doesn't see it. I have also tried making a separate
task that would be triggered by the receive task. The second task creates a new
netconn and connects to the remote host. This works for a short while but the
responses from the commands are not being processed and shortly fill the memory.
Does anyone have any suggestions? I have been stuck on this for a few days now
and I am all out of ideas.
Thanks
Keith
static void vInterlockTask1(void *pvParameters)
{
struct netconn *conn, *newconn;
err_t err;
LWIP_UNUSED_ARG(pvParameters);
struct netbuf *buf;
uint8_t data[128];
uint8_t *dataPtr;
uint16_t len;
/* Create a new connection identifier. */
conn = netconn_new(NETCONN_TCP);
/* Bind connection to the port number. */
err = netconn_bind(conn, NULL, INTERLOCK_PORT_1);
if (err != ERR_OK)
{
printf("Netcon Bind Error Status: %d\n",err);
}
/* Tell connection to go into listening mode. */
err = netconn_listen(conn);
if (err != ERR_OK)
{
printf("Netcon Listen Error Status: %d\n",err);
}
while(1)
{
if ((err = netconn_accept(conn, &newconn)) == ERR_OK)
{
while ((err = netconn_recv(newconn, &buf)) == ERR_OK)
{
do
{
netbuf_data(buf, (void**)&dataPtr, &len);
memcpy(&data[0],dataPtr,len);
RequestProcessor( dataPtr, &rspBuf[0], &rspLength );
// Send the response back
err = netconn_write(newconn, (void *)&data[0], len,
NETCONN_COPY);
if (err != ERR_OK)
{
printf("Error Status: %d\n",err);
}
} while (netbuf_next(buf) >= 0);
netbuf_delete(buf);
/* Command to remote system goes here??? */
}
}
netconn_close(newconn);
netconn_delete(newconn);
printf("Newconn error: %d\n",err);
}
}
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