The number of bytes that were actually queue for sending, which will be 0 if an error or timeout occurred.
Note that, because FreeRTOS does not implement errno, the behaviour in the presence of an error is necessarily different to that of sendto() functions that are fully compliant with the expected Berkeley sockets behaviour.
The first example sends to a socket using the standard calling semantics (see below for another example that uses the zero copy calling semantics). The socket is passed in as the function parameter, and is assumed to have already been created using a call to FreeRTOS_socket(). If ipconfigALLOW_SOCKET_SEND_WITHOUT_BIND is not set to 1 in FreeRTOSIPConfig.h, then the socket is also assumed to have been bound to a port number using FreeRTOS_bind().
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