Index: firmware/App/Services/Messaging.c
===================================================================
diff -u -r84b54a6a2e4478c49853f461b8e1ba560441f147 -r71c51efd08a5140276e78f090fee5f1698f5b5f1
--- firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision 84b54a6a2e4478c49853f461b8e1ba560441f147)
+++ firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision 71c51efd08a5140276e78f090fee5f1698f5b5f1)
@@ -8,7 +8,7 @@
 * @file    Messaging.c
 *
 * @author  (last)      Michael Garthwaite
-* @date    (last)      11-Jun-2026
+* @date    (last)      15-Jun-2026
 *
 * @author  (original)  Vinayakam Mani
 * @date    (original)  07-Aug-2024
@@ -294,7 +294,9 @@
     { MSG_ID_FP_SET_RECOVERY_VALVES_REQUEST,                                        &testIOFPSetValveRecoveryConfig },
     { MSG_ID_DD_SUBSTITUTION_PUMP_START_STOP_OVERRIDE_REQUEST,                      &testSubstitutionPumpStartStopOverride },
     { MSG_ID_DD_SUBSTITUTION_PUMP_BROADCAST_INTERVAL_OVERRIDE_REQUEST,              &testSubstitutionPumpDataPublishIntervalOverride },
-    { MSG_ID_DD_SUBSTITUTION_PUMP_TARGET_RATE_OVERRIDE_REQUEST,                    &testSubstitutionPumpTargetRateOverride },
+    { MSG_ID_DD_SUBSTITUTION_PUMP_TARGET_RATE_OVERRIDE_REQUEST,                     &testSubstitutionPumpTargetRateOverride },
+    { MSG_ID_DD_CONDUCTIVITY_SENSOR_CAL_REQUEST,                                    &testHandleConductivitySensorCalRequest },
+    { MSG_ID_FP_CONDUCTIVITY_SENSOR_CAL_REQUEST,                                    &testHandleConductivitySensorCalRequest },
 };
 
 /// Calculation for number of entries in the incoming message function handler look-up table.