Index: firmware/App/Services/DDInterface.h
===================================================================
diff -u -re9e339870c5ed01230963f00d400331ab879c91f -r1abc0349c736a70fb56db6895947abfbba0eee22
--- firmware/App/Services/DDInterface.h	(.../DDInterface.h)	(revision e9e339870c5ed01230963f00d400331ab879c91f)
+++ firmware/App/Services/DDInterface.h	(.../DDInterface.h)	(revision 1abc0349c736a70fb56db6895947abfbba0eee22)
@@ -8,7 +8,7 @@
 * @file    DDInterface.h
 *
 * @author  (last)      Raghu Kallala
-* @date    (last)      17-Apr-2026
+* @date    (last)      30-Apr-2026
 *
 * @author  (original)  Sean Nash
 * @date    (original)  01-Aug-2024
@@ -51,15 +51,19 @@
 DD_OP_MODE_T getDDOpMode( void );
 U32  getDDSubMode( void );
 F32  getDialysatePressure( void );
+BOOL getDialysateGoodToDeliverStatus( void );
 
 BOOL setDDOpMode( MESSAGE_T *message );
+BOOL setDialysateData( MESSAGE_T *message );
 BOOL setDialysatePressure( MESSAGE_T *message );
 
+void cmdStartPreGenerateDialysate( F32 qd, F32 dialTemp, F32 acidConvFactor, F32 bicarbConvFactor, U32 sodium, U32 bicarbonate );
 void cmdStartGenerateDialysate( F32 qd, F32 quf, F32 dialTemp, BOOL bypass, F32 acidConvFactor, F32 bicarbConvFactor, U32 sodium, U32 bicarbonate );
 void cmdChangeQd( F32 qd );
 void cmdChangeQuf( F32 quf );
 void cmdBypassDialyzer( BOOL bypass );
-void cmdStopGenerateDialysate( void );
+void cmdStopGenerateDialysate( void );
+void cmdSubstitutionRate (F32 qs );
 
 void handleDDCommandResponse( DD_CMD_RESPONSE_T *ddCmdRespPtr );
 BOOL getDDCommandResponse( U32 commandID, DD_CMD_RESPONSE_T *cmdRespPtr );