Index: firmware/App/Modes/FlushConcentrate.h
===================================================================
diff -u -r410afd26b3ae5e372310c696c82f58c59235e10d -r8d272582cbd2cb5fc0c6af0fead2867ce02658b0
--- firmware/App/Modes/FlushConcentrate.h	(.../FlushConcentrate.h)	(revision 410afd26b3ae5e372310c696c82f58c59235e10d)
+++ firmware/App/Modes/FlushConcentrate.h	(.../FlushConcentrate.h)	(revision 8d272582cbd2cb5fc0c6af0fead2867ce02658b0)
@@ -1,15 +1,56 @@
-/*
- * FlushConcentrate.h
+/**************************************************************************
+*
+* Copyright (c) 2024-2025 Diality Inc. - All Rights Reserved.
+*
+* THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
+* WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
+*
+* @file    FlushConcentrate.h
+*
+* @author  (last)      Michael Garthwaite
+* @date    (last)      03-Mar-2025
+*
+* @author  (original)  Michael Garthwaite
+* @date    (original)  03-Mar-2025
+*
+***************************************************************************/
+
+#ifndef __FLUSH_CONCENTRATE_H__
+#define __FLUSH_CONCENTRATE_H_
+
+#include "FPCommon.h"
+#include "FPDefs.h"
+
+/**
+ *  @defgroup FPConcentrateFlush FPConcentrateFlush
+ *  @brief Concentrate Flush unit. Manages Concentrate flush functions via a state machine.
  *
- *  Created on: Jul 2, 2025
- *      Author: fw
+ *  @addtogroup FPConcentrateFlush
+ *  @{
  */
 
-#ifndef APP_MODES_FLUSHCONCENTRATE_H_
-#define APP_MODES_FLUSHCONCENTRATE_H_
+// ********** public definitions **********
 
+/// Concentrate Flush data structure
+typedef struct
+{
+    U32 concentrateFlushExecState;                                   ///< Concentrate Flush execution state
+} CONC_FLUSH_DATA_T;
 
+// ********** public function prototypes **********
 
+void initConcentrateFlush( void );                                     // Initialize this Concentrate Flush unit
+U32  transitionToConcentrateFlush( void );                             // Transition to Concentrate Flush
+void execConcentrateFlush( void );                                     // Execute the Concentrate Flush state machine
+BOOL isConcentrateFlushComplete( void );                               // returns if flush is complete
+void signalStartConcentrateFlush( void );                              // signal to start flush
+void resetConcentrateFlushSignals( void );                             // reset signals for flush
 
+FP_CONC_FLUSH_STATE_T getCurrentConcentrateFlushState( void );         // Get the current state of the Concentrate Flush
 
-#endif /* APP_MODES_FLUSHCONCENTRATE_H_ */
+BOOL testConcentrateFlushDataPublishIntervalOverride( MESSAGE_T *message );
+BOOL testConcentrateFlushTimerOverride( MESSAGE_T *message );
+/**@}*/
+
+
+#endif