Index: firmware/App/Controllers/DGInterface.h
===================================================================
diff -u -r549119eae64732f124d22df66de4fc88c56193c0 -r9a45dcbdfae33fc06479d99b8d52bada8f682194
--- firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision 549119eae64732f124d22df66de4fc88c56193c0)
+++ firmware/App/Controllers/DGInterface.h	(.../DGInterface.h)	(revision 9a45dcbdfae33fc06479d99b8d52bada8f682194)
@@ -32,15 +32,25 @@
 
 // ********** public definitions **********
 
+#define DEFAULT_TARGET_FILL_FLOW_RATE_LPM   0.8     ///< Default target fill flow rate in L/min.
+
 // TODO remove the #defines
 #define DRAIN_RESERVOIR_TO_VOLUME_ML            0       ///< Drain reservoir to this volume (in mL) during treatment.
 #define FILL_RESERVOIR_TO_VOLUME_ML             1700    ///< Fill reservoir to this volume (in mL) during treatment.
 #define FILL_RESERVOIR_TO_VOLUME_LOW_FLOW_ML    1300    ///< Fill reservoir to this volume (in mL) during treatment if dialysate flow is slow.
 #define SLOW_DIALYSATE_FLOW_ML_MIN              250     ///< Threshold for slow dialysate flow designation.
 
-/// Dialysate flow meter data struct.
+/// DG Concentrate ratios data structure.
 typedef struct
 {
+    F32 acidMixingRatio;                            ///< Acid mixing ratio
+    F32 bicarbMixingRatio;                          ///< Bicarb mixing ratio
+    U32 fillPrepTimeMS;                             ///< Fill prepare time in milliseconds
+} DG_MIXING_RATIOS_T;
+
+/// Dialysate flow meter data structure.
+typedef struct
+{
     F32 measuredDialysateFlowRate;                  ///< Dialysate flow meter rate average measurement
 } DIALYSATE_FLOW_METER_DATA_T;
 
@@ -128,6 +138,7 @@
 F32 getReservoirWeightLargeFilter( DG_RESERVOIR_ID_T resID );
 F32 getDialysateTemperature( void );
 DG_DISINFECT_UI_STATES_T getDGDisinfectsStates( void );
+DG_MIXING_RATIOS_T getDGMixingRatios( void );
 
 void setDGOpMode( U32 opMode, U32 subMode );
 void setDialysateTemperatureReadings( F32 temp1, F32 temp2 );
@@ -136,13 +147,14 @@
 void setDialysateFlowData( F32 flowRate );
 void setNewLoadCellReadings( F32 res1Primary, F32 res1Backup, F32 res2Primary, F32 res2Backup );
 void setDGDisinfectsStates( DG_DISINFECT_UI_STATES_T states );
+void setDGMixingRatios( DG_MIXING_RATIOS_T ratios );
 
 void cmdSetDGDialysateTargetTemps( F32 primaryHtrTemp, F32 trimmerHtrTemp );
 void cmdStartDG( void );
 void cmdStopDG( void );
 void cmdSetDGActiveReservoir( DG_RESERVOIR_ID_T resID );
 void cmdChangeDGValveSetting( DG_VALVE_SETTING_ID_T valveSettingID );
-void cmdStartDGFill( U32 fillToVolMl );
+void cmdStartDGFill( U32 fillToVolMl, F32 targetFlowLPM );
 void cmdStopDGFill( void );
 void cmdStartDGDrain( U32 drainToVolMl, BOOL tareLoadCell, BOOL rinse, BOOL start );
 void cmdStartDGTrimmerHeater( void );
@@ -154,6 +166,7 @@
 void cmdStopDGHeatDisinfect( void );
 void cmdStartDGChemicalDisinfect( void );
 void cmdStopDGChemicalDisinfect( void );
+void cmdRequestDGMixingRatios( void );
 
 void handleDGCommandResponse( DG_CMD_RESPONSE_T *dgCmdRespPtr );
 BOOL getDGCommandResponse( U32 commandID, DG_CMD_RESPONSE_T *cmdRespPtr );