FreeRTOS+UDP was removed from the FreeRTOS kernel download from
FreeRTOS V10.1.0. See the FreeRTOS+TCP stack, which can be
configured for UDP only use, as an alternative.
void FreeRTOS_ReleaseUDPPayloadBuffer( void *pvBuffer );
FreeRTOS_ReleaseUDPPayloadBuffer() is used to return to the IP stack
a buffer that was used with the zero copy interface.
The zero copy interface for transmitting data is described on the
FreeRTOS_sendto() documentation page.
The zero copy interface for receiving data is described on the
FreeRTOS_recvfrom() documentation page.
A buffer needs to be returned to the stack if:
It is obtained from a call to FreeRTOS_recvfrom() and the data it contains
is no longer required, or
It was obtained from a call to FreeRTOS_GetUDPPayloadBuffer()
but the buffer could not be passed into the IP stack (the call to
FreeRTOS_sendto() in which the buffer was used failed).
A buffer can also be re-used rather than returned to the IP stack.
The buffer that is being returned to the IP stack.
The FreeRTOS_sendto() documentation page
includes an example zero copy send operation that demonstrates how to use FreeRTOS_ReleaseUDPPayloadBuffer()
when the send operation fails.
the FreeRTOS_recvfrom() documentation page
includes an example that demonstrates how to use FreeRTOS_ReleaseUDPPayloadBuffer() to release a buffer
obtained from a call to FreeRTOS_recvfrom().
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