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Basic TCP Client - Revision history
2026-04-18T19:48:00Z
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Harald: 1 revision imported
2016-10-27T16:02:52Z
<p>1 revision imported</p>
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Harald
http://www.ethernut.de/nutwiki/index.php?title=Basic_TCP_Client&diff=21&oldid=prev
Daniel: /* See also */
2008-12-02T17:44:10Z
<p><span dir="auto"><span class="autocomment">See also</span></span></p>
<p><b>New page</b></p><div>First register network driver and configure interface by using DHCP.<br />
<br />
<source lang="c"><br />
NutRegisterDevice(&DEV_ETHER, 0, 0);<br />
if (NutDhcpIfConfig(DEV_ETHER_NAME, 0, 60000)) {<br />
/* Error: Cannot configure interface. */<br />
}<br />
</source><br />
<br />
There are several alternatives:<br />
* [[Network Configuration Using Hard Coded Configuration]]<br />
* [[Network Configuration Using Stored Configuration]]<br />
* [[Network Configuration Using a Configuration Editor]]<br />
<br />
Next, connect the server with the given IP address (192.168.1.100) at a specified port (8000).<br />
<br />
<source lang="c"><br />
sock = NutTcpCreateSocket();<br />
if (NutTcpConnect(sock, inet_addr("192.168.1.100"), 8000)) {<br />
/* Error: Cannot connect server. */<br />
}<br />
</source><br />
<br />
You may then send data to the server...<br />
<br />
<source lang="c"><br />
if (NutTcpSend(sock, buffer, len) != len) {<br />
/* Error: Cannot send data. */<br />
}<br />
</source><br />
<br />
... or receive data from the server.<br />
<br />
<source lang="c"><br />
got = NutTcpRecv(sock, buffer, len);<br />
if (got <= 0) {<br />
/* Error: Cannot receive data. */<br />
}<br />
</source><br />
<br />
When done, close the connection by closing the socket.<br />
<br />
<source lang="c"><br />
NutTcpCloseSocket(sock);<br />
</source><br />
<br />
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. The snippet below used fwrite() and fread().<br />
<br />
<source lang="c"><br />
FILE *stream;<br />
/* ... more code here ... */<br />
<br />
stream = _fdopen((int) sock, "r+b");<br />
/* ... more code here ... */<br />
<br />
/* Sending data. */<br />
fwrite(buffer, 1, len, stream);<br />
/* ... more code here ... */<br />
<br />
/* Receiving data. */<br />
got = fread(buffer, 1, len, stream);<br />
/* ... more code here ... */<br />
</source><br />
<br />
Do not forget to close the stream with fclose() and socket with NutTcpCloseSocket().<br />
<br />
== See also ==<br />
* [[Basic TCP Server]]<br />
* [[Network Configuration Using Stored Configuration]]<br />
* [[Network Configuration Using Hard Coded Configuration]]<br />
* [[Network Configuration Using a Configuration Editor]]<br />
* [[Discovery Service]]<br />
* More [[Nut/OS Examples]]<br />
<br />
[[Category:Code Snippets]]<br />
<br />
{{Languages}}</div>
Daniel