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[FreeRTOS+TCP API Reference]
BaseType_t FreeRTOS_issocketconnected( Socket_t xSocket );
Tests to see if a socket is connected.
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 is in the Established or a FIN wait state then pdTRUE is returned. Otherwise pdFALSE is returned;