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FreeRTOS+TCP V2 is now included in the main FreeRTOS kernel download under the MIT license.

FreeRTOS_maywrite()

[FreeRTOS+TCP API Reference]

FreeRTOS_sockets.h
BaseType_t FreeRTOS_maywrite( Socket_t xSocket );
		

Returns the number of bytes that can be added to a TCP socket's Tx stream before the Tx stream is full.

Parameters:

xSocket   The socket being queried.

Returns:

If the socket referenced by the xSocket parameter is not a TCP socket then -pdFREERTOS_ERRNO_EINVAL is returned.

If the socket is not in a state that allows data to be sent (for example it is in the Listening state or is in the process of being shut down) then -1 is returned.

If the socket is in the Established the returned value is the number of bytes that can be added to the socket's Tx stream.


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