BaseType_t xMessageBufferIsFull( MessageBufferHandle_t xMessageBuffer );
Queries a message buffer to see if it is full.
A message buffer is full if it cannot accept any more messages, of any size,
until space is made available by a message being removed from the message buffer.
Message buffer functionality is enabled by including the FreeRTOS/source/stream_buffer.c
source file in the build (as message buffers use stream buffers).
The handle of the message buffer being queried.
If the message buffer is full then pdTRUE is returned. Otherwise
pdFALSE is returned.
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