Index: MsgDefs.h
===================================================================
diff -u -r6d2e5f3a412ca6e6ebc022600d342196eca7962c -rfbe6f80ab0ba886e053ec27790d69d924e54ab32
--- MsgDefs.h	(.../MsgDefs.h)	(revision 6d2e5f3a412ca6e6ebc022600d342196eca7962c)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision fbe6f80ab0ba886e053ec27790d69d924e54ab32)
@@ -9,7 +9,7 @@
 * @file    MsgDefs.h
 *
 * @author  (last)      Raghu Kallala
-* @date    (last)      22-Apr-2026
+* @date    (last)      29-Apr-2026
 *
 * @author  (original)  Sean Nash
 * @date    (original)  01-Aug-2024
@@ -195,6 +195,7 @@
     MSG_ID_UI_WATER_SAMPLE_RESULT_REQUEST = 0xA3,                                   ///< UI water sample result request
     MSG_ID_UI_PRESSURE_LIMIT_WIDEN_REQUEST = 0xA4,                                  ///< UI pressure limit widen request.
     MSG_ID_TD_PRESSURE_LIMIT_WIDEN_RESPONSE = 0xA5,                                 ///< TD pressure limit widen response.
+    MSG_ID_DD_SUBSTITUTION_PUMP_DATA = 0xA9,                                        ///< DD substitution pump broadcast data.
 
     // service/test CAN messages
     MSG_ID_FIRST_TD_TESTER_MESSAGE = 0x8000,                                        ///< First TD test message ID
@@ -380,7 +381,9 @@
     MSG_ID_DD_DIALYSATE_DELTA_CONDUCTIVITY_OVERRIDE_REQUEST = 0xA069,                   ///< DD Dialysate delta target conductivity override
     MSG_ID_DD_BICART_UPPER_PRESSURE_OVERRIDE_REQUEST = 0xA06A,                          ///< DD bicarb cartridge upper threshold pressure override
     MSG_ID_DD_BICART_LOWER_PRESSURE_OVERRIDE_REQUEST = 0xA06B,                          ///< DD bicarb cartridge lower threshold pressure override
-    MSG_ID_DD_FLOATER_LEVEL_OVERRIDE_REQUEST = 0xA06C,                                  ///< DD override request for D6 floater level override
+    MSG_ID_DD_FLOATER_LEVEL_OVERRIDE_REQUEST = 0xA06C,                                  ///< DD floater level override request
+    MSG_ID_DD_SUBSTITUTION_PUMP_START_STOP_OVERRIDE_REQUEST = 0xA06D,                   ///< DD substitution pump start stop override request
+    MSG_ID_DD_SUBSTITUTION_PUMP_BROADCAST_OVERRIDE_REQUEST = 0xA06E,                    ///< DD substitution pump broadcast override request
 
     MSG_ID_FIRST_FP_TESTER_MESSAGE = 0xB000,                                            ///< First FP test message ID
     MSG_ID_FP_TESTER_LOGIN_REQUEST = MSG_ID_FIRST_FP_TESTER_MESSAGE,                    ///< FP tester log-in
@@ -399,7 +402,7 @@
     MSG_ID_FP_PRESSURE_SENSOR_FILTER_TEMPERATURE_OVERRIDE_REQUEST = 0xB00D,             ///< FP pressure sensor filter temperature override request
     MSG_ID_FP_PRESSURE_PUBLISH_INTERVAL_OVERRIDE_REQUEST = 0xB00E,                      ///< FP pressures data publish interval override request
     MSG_ID_FP_LEVEL_PUBLISH_INTERVAL_OVERRIDE_REQUEST = 0xB00F,                         ///< FP level data publish interval override request
-    MSG_ID_FP_FLOATER_LEVEL_OVERRIDE_REQUEST = 0xB010,                                  ///< FP override request for P25 floater level sensor.
+    MSG_ID_FP_FLOATER_LEVEL_OVERRIDE_REQUEST = 0xB010,                                  ///< FP override request for level sensor.
     MSG_ID_FP_FLOWS_PUBLISH_INTERVAL_OVERRIDE_REQUEST = 0xB011,                         ///< FP flows data publish interval override request
     MSG_ID_FP_FLOW_RATE_OVERRIDE_REQUEST = 0xB012,                                      ///< FP override request for flow rate (mL/min)
     MSG_ID_FP_FLOW_TEMP_OVERRIDE_REQUEST = 0xB013,                                      ///< FP override request for flow temperature (deg C)
Index: TDDefs.h
===================================================================
diff -u -r6d2e5f3a412ca6e6ebc022600d342196eca7962c -rfbe6f80ab0ba886e053ec27790d69d924e54ab32
--- TDDefs.h	(.../TDDefs.h)	(revision 6d2e5f3a412ca6e6ebc022600d342196eca7962c)
+++ TDDefs.h	(.../TDDefs.h)	(revision fbe6f80ab0ba886e053ec27790d69d924e54ab32)
@@ -7,8 +7,8 @@
 *
 * @file    TDDefs.h
 *
-* @author  (last)      Varshini Nagabooshanam
-* @date    (last)      10-Mar-2026
+* @author  (last)      Raghu Kallala
+* @date    (last)      28-Apr-2026
 *
 * @author  (original)  Sean Nash
 * @date    (original)  01-Aug-2024