Index: MsgDefs.h
===================================================================
diff -u -rc60bb4621d99b7a07a4595bd77da06ffd8456362 -re3dae99d233b902b595cc5f560e823d909eaae92
--- MsgDefs.h	(.../MsgDefs.h)	(revision c60bb4621d99b7a07a4595bd77da06ffd8456362)
+++ MsgDefs.h	(.../MsgDefs.h)	(revision e3dae99d233b902b595cc5f560e823d909eaae92)
@@ -8,8 +8,8 @@
 *
 * @file    MsgDefs.h
 *
-* @author  (last)      Varshini Nagabooshanam
-* @date    (last)      19-Jan-2026
+* @author  (last)      Michael Garthwaite
+* @date    (last)      27-Jan-2026
 *
 * @author  (original)  Sean Nash
 * @date    (original)  01-Aug-2024
@@ -354,10 +354,11 @@
     MSG_ID_DD_RINSE_PUMP_DATA_PUBLISH_INTERVAL_OVERRIDE_REQUEST = 0xA053,           ///< DD rinse pump broadcast data override request
     MSG_ID_DD_RINSE_PUMP_PWM_PERCENT_OVERRIDE_REQUEST = 0xA054,                     ///< DD rinse pump PWM percent override request
     MSG_ID_DD_RINSE_PUMP_TURN_ON_OFF_REQUEST = 0xA055,                              ///< DD rinse pump turn on/off request
-    MSG_ID_DD_DRY_BICART_DATA_PUBLISH_INTERVAL_OVERRIDE_REQUEST = 0xA056,           ///< DD dry bicart broadcast data overrride request
-    MSG_ID_DD_DRY_BICART_FILL_CYCLE_MAX_OVERRIDE_REQUEST = 0xA057,                  ///< DD dry bicart fill cycle max count overrride request
-    MSG_ID_DD_DRY_BICART_FILL_REQUEST_OVERRIDE_REQUEST = 0xA058,                    ///< DD dry bicart fill request overrride request
-    MSG_ID_DD_BICARB_CHAMBER_FILL_REQUEST_OVERRIDE_REQUEST = 0xA059,                ///< DD bicarb chamber fill request overrride request
+    MSG_ID_DD_SET_CONDUCTIVITY_MODEL_REQUEST = 0xA056,
+    MSG_ID_DD_DRY_BICART_DATA_PUBLISH_INTERVAL_OVERRIDE_REQUEST = 0xA057,           ///< DD dry bicart broadcast data overrride request
+    MSG_ID_DD_DRY_BICART_FILL_CYCLE_MAX_OVERRIDE_REQUEST = 0xA058,                  ///< DD dry bicart fill cycle max count overrride request
+    MSG_ID_DD_DRY_BICART_FILL_REQUEST_OVERRIDE_REQUEST = 0xA059,                    ///< DD dry bicart fill request overrride request
+    MSG_ID_DD_BICARB_CHAMBER_FILL_REQUEST_OVERRIDE_REQUEST = 0xA05A,                ///< DD bicarb chamber fill request overrride 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