Index: firmware/App/Modes/ModeStandby.h
===================================================================
diff -u -rb64c49fdcf2b6d95e61e63f8e258c4e600935bbd -re6c60e07b450ec8d58e87bf13d45f96efab54d8b
--- firmware/App/Modes/ModeStandby.h	(.../ModeStandby.h)	(revision b64c49fdcf2b6d95e61e63f8e258c4e600935bbd)
+++ firmware/App/Modes/ModeStandby.h	(.../ModeStandby.h)	(revision e6c60e07b450ec8d58e87bf13d45f96efab54d8b)
@@ -1,28 +1,66 @@
 /**************************************************************************
- *
- *  Copyright (c) 2019-2020 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 ModeStandby.h
- *
- *  @date  11-Dec-2019
- *  @author L. Baloa
- *
- *  @brief Header file for Standby Mode.
- *
- **************************************************************************/
+*
+* Copyright (c) 2019-2024 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    ModeStandby.h
+*
+* @author  (last)      Dara Navaei
+* @date    (last)      23-Jul-2024
+*
+* @author  (original)  Dara Navaei
+* @date    (original)  05-Nov-2019
+*
+***************************************************************************/
 
 #ifndef __MODE_STANDBY_H__
 #define __MODE_STANDBY_H__
 
 #include "DGCommon.h"
+#include "DGDefs.h"
 
-// ********** private function prototypes **********
+/**
+ *  @defgroup DGStandbyMode DGStandbyMode
+ *  @brief Standby mode module. Manages standby mode functions via a state machine.
+ *
+ *  @addtogroup DGStandbyMode
+ *  @{
+ */
 
-void initStandbyMode( void );          // initialize this module
-void transitionToStandbyMode( void );  // prepares for transition to standby mode
-void execStandbyMode( void );          // execute the standby mode state machine (call from OperationModes)
+// ********** public definitions **********
 
+/// Standby mode data structure
+typedef struct
+{
+    U32 timeout;                                        ///< Timeout.
+    U32 countdown;                                      ///< Count down.
+} STANDBY_MODE_DATA_T;
+
+// ********** public function prototypes **********
+
+void initStandbyMode( void );                           // initialize this module
+U32 transitionToStandbyMode( void );                    // prepares for transition to standby mode
+U32  execStandbyMode( void );                           // execute the standby mode state machine (call from OperationModes)
+
+void waterSampleCommandHandler( SAMPLE_WATER_CMD_T sampleWaterCmd );  // handle water sample command
+BOOL requestDGStart( void );                            // HD requests DG start (go to generation idle mode)
+
+BOOL signalAbortWaterSampling( void );                  // HD signal to abort water sampling.
+BOOL startDGFlush( void );                              // HD start flush mode
+BOOL startDGHeatDisinfect( BOOL isPassive );            // HD start heat disinfect mode
+BOOL startDGHeatDisinfectActiveCool( void );
+DG_STANDBY_MODE_STATE_T getCurrentStandbyState( void ); // get the current state of the standby mode.
+
+BOOL startDGChemicalDisinfect( void );                  // HD start chemical disinfect mode
+BOOL startDGChemicalDisinfectFlush( void );             // HD start chemical disinfect flush mode
+
+BOOL startDGROPermeateSample( void );                   // HD start RO permeate sample
+
+BOOL testSetFilterFlushTimePeriodOverride( U32 value ); // set filter flush time period override.
+BOOL testResetFilterFlushTimePeriodOverride( void );    // reset filter flush time period override.
+
+/**@}*/
+
 #endif