BaseType_t xStreamBufferIsEmpty( StreamBufferHandle_t xStreamBuffer );
Queries a stream buffer to see if it is empty.
A stream buffer is empty if it does not contain any data.
Stream buffer functionality is enabled by including the FreeRTOS/source/stream_buffer.c
source file in the build.
The handle of the stream buffer being queried.
If the stream buffer is empty then pdTRUE is returned. Otherwise
pdFALSE is returned.
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