Index: firmware/App/Controllers/BalancingChamber.c
===================================================================
diff -u -r0bcac6885c8461b05da276fd245b580b7339ddfd -ree311636fcfb7db1913edef2d9fea22153465a87
--- firmware/App/Controllers/BalancingChamber.c	(.../BalancingChamber.c)	(revision 0bcac6885c8461b05da276fd245b580b7339ddfd)
+++ firmware/App/Controllers/BalancingChamber.c	(.../BalancingChamber.c)	(revision ee311636fcfb7db1913edef2d9fea22153465a87)
@@ -23,6 +23,7 @@
 #include "FpgaDD.h"
 #include "Heaters.h"
 #include "Level.h"
+#include "MessageSupport.h"
 #include "ModeGenDialysate.h"
 #include "ModeStandby.h"
 #include "Messaging.h"
@@ -108,6 +109,8 @@
 
 //TODO: remove later once level sensor working
 static U32 bicarbChamberPeriodicFillCounter;  
+// Balancing chamber state change tracker
+static BAL_CHAMBER_EXEC_STATE_T prevState;                                                      ///< Balancing chamber Previous State tracking variable
 
 // ********** private function prototypes **********
 
@@ -184,6 +187,7 @@
     pendingTdDialysateFlowrate                  = 0.0F;
     isBalChamberSwitchingPeriodUpdatePending    = FALSE;
     bcSwitchingBasedOnClosedPeriodCounter       = 0;
+    prevState                                   = BAL_CHAMBER_STATE_IDLE;
     //TODO:remove once level sensor working
     bicarbChamberPeriodicFillCounter            = 0;
 }
@@ -414,6 +418,27 @@
             break;
     }
 
+    if ( prevState != balChamberExecState )
+    {
+        if ( BAL_CHAMBER_STATE_IDLE == balChamberExecState )
+        {
+            SEND_EVENT_WITH_2_U32_DATA( DD_EVENT_BC_STATE_CHANGE, prevState, balChamberExecState );
+        }
+        else if ( BAL_CHAMBER_STATE1_FILL_END == prevState && BAL_CHAMBER_STATE2_FILL_START == balChamberExecState )
+        {
+            SEND_EVENT_WITH_2_U32_DATA( DD_EVENT_BC_STATE_CHANGE, prevState, balChamberExecState );
+        }
+        else if ( BAL_CHAMBER_STATE2_FILL_END == prevState && BAL_CHAMBER_STATE1_FILL_START == balChamberExecState )
+        {
+            SEND_EVENT_WITH_2_U32_DATA( DD_EVENT_BC_STATE_CHANGE, prevState, balChamberExecState );
+        }
+        else if ( BAL_CHAMBER_STATE_IDLE == prevState && BAL_CHAMBER_STATE1_FILL_START == balChamberExecState )
+        {
+            SEND_EVENT_WITH_2_U32_DATA( DD_EVENT_BC_STATE_CHANGE, prevState, balChamberExecState );
+        }
+    }
+    prevState = balChamberExecState;
+
     //Publish balancing chamber data
     publishBalChamberData();
 
@@ -1472,6 +1497,7 @@
  *************************************************************************/
 void setBalChamberSwitchingOnlyStatus( BOOL OnOff )
 {
+    SEND_EVENT_WITH_2_U32_DATA( DD_EVENT_BC_SWITCH_ONLY_MODE_CHANGE, balanceChamberSwitchingOnly,isBalChamberSwitchingActive );
     balanceChamberSwitchingOnly = OnOff;
 }
 
Index: firmware/App/Controllers/DryBiCart.c
===================================================================
diff -u -r581f75133863205963703e6e6970ac66ee5228c1 -ree311636fcfb7db1913edef2d9fea22153465a87
--- firmware/App/Controllers/DryBiCart.c	(.../DryBiCart.c)	(revision 581f75133863205963703e6e6970ac66ee5228c1)
+++ firmware/App/Controllers/DryBiCart.c	(.../DryBiCart.c)	(revision ee311636fcfb7db1913edef2d9fea22153465a87)
@@ -24,6 +24,7 @@
 #include "DryBiCart.h"
 #include "Level.h"
 #include "Messaging.h"
+#include "MessageSupport.h"
 #include "ModeGenDialysate.h"
 #include "OperationModes.h"
 #include "PIControllers.h"
@@ -219,6 +220,8 @@
 static PI_CONTROLLER_SIGNALS_DATA bicarbControlSignals;                                         ///< Bicarb closed loop control signal data
 static PI_CONTROLLER_SIGNALS_DATA acidControlSignals;                                           ///< Acid closed loop control signal data
 
+static DRY_BICART_OPERATION_T prevState;                                                       ///< Last dry bicart operation prior to current state.
+
 // ********** private function prototypes **********
 
 static void updateDrybicartOperation(void);
@@ -399,6 +402,7 @@
     dryBiCartDrainCondStableCount                       = 0;
     dryBiCartDrainTimePeriod                            = 0;
     dryBiCartPersistanceStartTime                       = 0;
+    prevState                                           = DRY_BICART_IDLE;
 
     initializePIController( PI_CONTROLLER_ID_BICARB_VOL, 0.0F,\
                            getBicarbKpGainCoefficient(), getBicarbKiGainCoefficient(),\
@@ -515,6 +519,12 @@
             break;
     }
 
+    if ( prevState != dryBicartStartRequest )
+    {
+        SEND_EVENT_WITH_2_U32_DATA( DD_EVENT_DRY_BICART_STATE_CHANGE, prevState, dryBicartStartRequest );
+        prevState = dryBicartStartRequest;
+    }
+
     // Publish dry bicart data
     publishDryBicartData();
 }
Index: firmware/App/Controllers/Heaters.c
===================================================================
diff -u -r9eae2f683887bededd2240f51ddfc667d8c1d566 -ree311636fcfb7db1913edef2d9fea22153465a87
--- firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision 9eae2f683887bededd2240f51ddfc667d8c1d566)
+++ firmware/App/Controllers/Heaters.c	(.../Heaters.c)	(revision ee311636fcfb7db1913edef2d9fea22153465a87)
@@ -788,6 +788,7 @@
 
         // update duty cycle
         setHeaterControl( heater );
+        SEND_EVENT_WITH_2_U32_DATA( DD_EVENT_HEATER_STATE_CHANGE, heater, 0);
     }
     else
     {
@@ -919,6 +920,7 @@
 
         // proceed to setup state
         state = HEATER_EXEC_STATE_RAMP_TO_TARGET;
+        SEND_EVENT_WITH_2_U32_DATA( DD_EVENT_HEATER_STATE_CHANGE, heater, 1 );
     }
 
     return state;
Index: firmware/App/Controllers/Ultrafiltration.c
===================================================================
diff -u -r0bcac6885c8461b05da276fd245b580b7339ddfd -ree311636fcfb7db1913edef2d9fea22153465a87
--- firmware/App/Controllers/Ultrafiltration.c	(.../Ultrafiltration.c)	(revision 0bcac6885c8461b05da276fd245b580b7339ddfd)
+++ firmware/App/Controllers/Ultrafiltration.c	(.../Ultrafiltration.c)	(revision ee311636fcfb7db1913edef2d9fea22153465a87)
@@ -204,8 +204,9 @@
  *************************************************************************/
 static void updateUFRequest( void )
 {
-    F32 qd      = getTDDialysateFlowrate();
-    BOOL bypass = getTDDialyzerBypass();
+    F32 qd         = getTDDialysateFlowrate();
+    BOOL bypass    = getTDDialyzerBypass();
+    BOOL prevState = isUltrafiltrationRequested;
 
     // update latest UF run/pause request
     // if qd is zero or dialyzer is bypassed, UF pump should be turn off
@@ -217,6 +218,12 @@
     {
         isUltrafiltrationRequested = FALSE;
     }
+
+    // event update on state switch
+    if( prevState != isUltrafiltrationRequested )
+    {
+        SEND_EVENT_WITH_2_U32_DATA( DD_EVENT_UF_STATE_CHANGE, prevState, isUltrafiltrationRequested );
+    }
 }
 
 /*********************************************************************//**
Index: firmware/App/Tasks/TaskPriority.c
===================================================================
diff -u -r9eae2f683887bededd2240f51ddfc667d8c1d566 -ree311636fcfb7db1913edef2d9fea22153465a87
--- firmware/App/Tasks/TaskPriority.c	(.../TaskPriority.c)	(revision 9eae2f683887bededd2240f51ddfc667d8c1d566)
+++ firmware/App/Tasks/TaskPriority.c	(.../TaskPriority.c)	(revision ee311636fcfb7db1913edef2d9fea22153465a87)
@@ -107,7 +107,7 @@
     // Monitor rinse pump
     execRinsePumpMonitor();
 
-    // Monitor Substituion pump
+    // Monitor Substitution pump
     execSubstitutionPumpMonitor();
 
     // Second pass for FPGA