Basic TCP Client
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First register network driver and configure interface by using DHCP.
NutRegisterDevice(&DEV_ETHER, 0, 0); if (NutDhcpIfConfig(DEV_ETHER_NAME, 0, 60000)) { /* Error: Cannot configure interface. */ }
There are several alternatives:
- Network Configuration Using Hard Coded Configuration
- Network Configuration Using Stored Configuration
- Network Configuration Using a Configuration Editor
Next, connect the server with the given IP address (192.168.1.100) at a specified port (8000).
sock = NutTcpCreateSocket(); if (NutTcpConnect(sock, inet_addr("192.168.1.100"), 8000)) { /* Error: Cannot connect server. */ }
You may then send data to the server...
if (NutTcpSend(sock, buffer, len) != len) { /* Error: Cannot send data. */ }
... or receive data from the server.
got = NutTcpRecv(sock, buffer, len); if (got <= 0) { /* Error: Cannot receive data. */ }
When done, close the connection by closing the socket.
NutTcpCloseSocket(sock);
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().
FILE *stream; /* ... more code here ... */ stream = _fdopen((int) sock, "r+b"); /* ... more code here ... */ /* Sending data. */ fwrite(buffer, 1, len, stream); /* ... more code here ... */ /* Receiving data. */ got = fread(buffer, 1, len, stream); /* ... more code here ... */
Do not forget to close the stream with fclose() and socket with NutTcpCloseSocket().
See also
- Basic TCP Server
- Network Configuration Using Stored Configuration
- Network Configuration Using Hard Coded Configuration
- Network Configuration Using a Configuration Editor
- Discovery Service
- More Nut/OS Examples
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