Index: firmware/App/Services/Messaging.c
===================================================================
diff -u -r5f1b50a1d9a7bd6ea17bb666e28ccfeafe56432c -r4a1f0518f867d1bc5d27d452a8306e43159e9a51
--- firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision 5f1b50a1d9a7bd6ea17bb666e28ccfeafe56432c)
+++ firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision 4a1f0518f867d1bc5d27d452a8306e43159e9a51)
@@ -59,6 +59,7 @@
 #include "StateFlushFilterDefeatured.h"
 #include "StateFlushPermeate.h"
 #include "StateInletPressureCheck.h"
+#include "SubstitutionPump.h"
 #include "SystemCommDD.h"
 #include "Temperature.h"
 #include "TestSupport.h"
@@ -290,6 +291,9 @@
     { MSG_ID_FP_CONDUCTIVITY_SENSOR_VERSION_REQUEST,                                &testHandleConductivitySensorVersionRequest },
     { MSG_ID_DD_TEMPERATURE_SENSOR_FILTERED_TEMP_OVERRIDE_REQUEST,                  &testDDTemperatureSensorFilteredReadingsOverride },
     { 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 },
 };
 
 /// Calculation for number of entries in the incoming message function handler look-up table.