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[FreeRTOS+TCP API Reference]
BaseType_t FreeRTOS_recvcount( Socket_t xSocket );
Returns the number of bytes in a TCP socket’s Rx stream that are yet to be read.
The socket being queried.
If the socket referenced by the xSocket parameter is not a TCP socket then -pdFREERTOS_ERRNO_EINVAL is returned.
If the socket referenced by the xSocket parameter does not yet have an Rx stream then 0 is returned (the Rx stream is not created until it is required).
In all other cases the returned value is the number of bytes that remain in the socket’s Rx stream.