Hi,
I am working on establishing Client-Server module over TCP.I have put a set up
such that my PC acts as a normal server where I can connect it from some other
PC's on my LAN using 'telnet ipaddress port' command and once I get connected
with the server and can give some input from client computer so that it gets
displayed on my server window(connection is established and data exchange takes
place).
Until here I can say that the server is working fine and what i wanted to
implement is that now I wrote a code using lwIP API for the Altium Nanaboard so
that my NB3000 acts like a client and i wanted it to get connected to my PC
Server.
Here goes my code for the client part which gets connected to the Server with
given IPaddress.
int tcp_client(void)
{
char data[] = "Hello World";
struct netconn *conn;
struct ip_addr ServAddr;
err_t err;
u16_t port;
port = 7777;
conn = netconn_new(NETCONN_TCP);
IP4_ADDR(&ServAddr, 192,168,xx,xxx);
err = netconn_connect(conn, &ServAddr, port);
printf("err = %d", err); //err = -4 this is the value I am getting for err.
if(err == ERR_OK)
netconn_write(conn, data, sizeof(data), NETCONN_NOCOPY);
netconn_close(conn);
netconn_delete(conn);
}
}
here i open a new connection and connect it to Server using its IPaddress.
Before that I wanted to check the connection whether it is connected or not, so
what i did is i assigned a variable "err" and when I try to print it out on the
terminal instrument and see the value it gives a value of "-4".
Is this correct what I am doing here so that if i get a negative value that
means the client is successfully connected to the server.
If so how can i transfer the data "Hello World" on to my server and get it
displayed there.
Kind Regards,
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