A TCP socket that is
not connected can be closed using the
FreeRTOS_closesocket()
API function.
A TCP socket that is connected should not be closed until the
connection has been shut down. To gracefully shut down a socket first
call FreeRTOS_shutdown(),
then wait for read attempts on the socket to return -pdFREERTOS_ERRNO_EINVAL, indicating
that the socket is no longer connected.
The source code examples on both the
Sending TCP Data
and the Receiving TCP Data pages demonstrate a connected
socket being shut down then closed.
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