Harald: 1 revision imported

2016-10-27T16:02:52Z

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Niziak at 11:58, 12 April 2011

2011-04-12T11:58:25Z

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First register network driver and configure interface by using DHCP.

<source lang="c">
NutRegisterDevice(&DEV_ETHER, 0, 0);
if (NutDhcpIfConfig(DEV_ETHER_NAME, 0, 60000)) {
/* Error: Cannot configure interface. */
}
</source>

There are several alternatives:
* [[Network Configuration Using Hard Coded Configuration]]
* [[Network Configuration Using Stored Configuration]]
* [[Network Configuration Using a Configuration Editor]]

Next, create a socket and wait for client connections at a specified port (8000).

<source lang="c">
sock = NutTcpCreateSocket();
if (NutTcpAccept(sock, 8000)) {
/* Error: Cannot connect server. */
}
</source>

To prevent DOS attack, set timeout value for established TCP connection:

<source lang="c">
uint32_t to = 10000;
NutTcpSetSockOpt(sock, SO_RCVTIMEO, &to, sizeof(to));
</source>
You may then receive data from the client...

<source lang="c">
got = NutTcpRecv(sock, buffer, len);
if (got <= 0) {
/* Error or connection closed by the client. */
}
</source>

... or send data to the client.

<source lang="c">
if (NutTcpSend(sock, buffer, len) != len) {
/* Error or connection closed by the client. */
}
</source>

When done, close the socket. This will also close the connection if it is still established.

<source lang="c">
NutTcpCloseSocket(sock);
</source>

For more advanced applications you can redirect the connected socket to a file stream and use standard I/O functions like fprintf() or fscanf() for sending and receiving data.

<source lang="c">
FILE *stream;
/* ... more code here ... */

stream = _fdopen((int) sock, "r+b");
/* ... more code here ... */

/* Sending data. */
fprintf(stream, "Welcome!\r\n");
/* ... more code here ... */

/* Receiving data. */
got = fread(buffer, 1, len, stream);
/* ... more code here ... */
</source>

Do not forget to close the stream with fclose() and socket with NutTcpCloseSocket().

== See also ==
* [[Network Configuration Using Stored Configuration]]
* [[Network Configuration Using Hard Coded Configuration]]
* [[Network Configuration Using a Configuration Editor]]
* [[Basic TCP Client]]
* [[Socket Timeouts]]
* [[Discovery Service]]
* More [[Nut/OS Examples]]

[[Category:Code Snippets]]

{{Languages}}

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Harald: 1 revision imported

Niziak at 11:58, 12 April 2011