Hi all,
Anybody know how to use the send_frame function in RL-TCPnet ?
Yes. It is used internally by TCPnet and is not expected to be used directly by an application.
The source code for it is freely available in the Ethernet drivers and it is part of the driver interface. A quick glance at the code reveals what it should be called with and what it does.
Of course you could call it directly, but you would be well advised to ensure that you understand the consequences of what you would be doing and that your use does not interfere with the operation of TCPnet.