BaseType_t xMessageBufferIsEmpty( MessageBufferHandle_t xMessageBuffer );
Queries a message buffer to see if it is empty.
A message buffer is empty if it does not contain any messages.
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 empty then pdTRUE is returned. Otherwise
pdFALSE is returned.
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