Index: firmware/App/Services/Messaging.c
===================================================================
diff -u -r3b3844d54e3dbe97512bf245b2fc1acc7f9976d1 -r4db3ead9f59d2adf72d4777c9f69f55beb820cd9
--- firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision 3b3844d54e3dbe97512bf245b2fc1acc7f9976d1)
+++ firmware/App/Services/Messaging.c	(.../Messaging.c)	(revision 4db3ead9f59d2adf72d4777c9f69f55beb820cd9)
@@ -8,7 +8,7 @@
 * @file    Messaging.c
 *
 * @author  (last)      Vijay Pamula
-* @date    (last)      14-Jul-2026
+* @date    (last)      27-Jul-2026
 *
 * @author  (original)  Sean Nash
 * @date    (original)  01-Aug-2024
@@ -32,6 +32,7 @@
 #include "LevelSensors.h"
 #include "Messaging.h"
 #include "ModeInitPOST.h"
+#include "ModePreTreat.h"
 #include "ModeStandby.h"
 #include "ModeTreatment.h"
 #include "OperationModes.h"
@@ -123,6 +124,7 @@
     { MSG_ID_UI_VITALS_ADJUSTMENT_REQUEST,                              &vitalsAdjustmentHandleChangeRequest },
     { MSG_ID_UI_BOLUS_VOLUME_CHANGE_REQUEST,                            &validateAndSetBolusVolume },
     { MSG_ID_UI_INITIATE_TREATMENT_WORKFLOW,                            &signalUserInitiateTreatment },
+    { MSG_ID_UI_START_TREATMENT_REQUEST,                                &handleStartTreatmentRequest },
     { MSG_ID_UI_UF_PAUSE_RESUME_REQUEST,                                &signalPauseResumeUF },
     { MSG_ID_TESTER_LOGIN_REQUEST,                                      &handleTesterLogInRequest },
     { MSG_ID_UI_PRESSURE_LIMIT_WIDEN_REQUEST,                           &pressureLimitHandleWidenRequest },
Index: firmware/App/Services/Messaging.h
===================================================================
diff -u -r8b97a7e50a19f1c243559ad77c69b6a9e6ad067a -r4db3ead9f59d2adf72d4777c9f69f55beb820cd9
--- firmware/App/Services/Messaging.h	(.../Messaging.h)	(revision 8b97a7e50a19f1c243559ad77c69b6a9e6ad067a)
+++ firmware/App/Services/Messaging.h	(.../Messaging.h)	(revision 4db3ead9f59d2adf72d4777c9f69f55beb820cd9)
@@ -7,8 +7,8 @@
 *
 * @file    Messaging.h
 *
-* @author  (last)      Praneeth Bunne
-* @date    (last)      04-Jun-2026
+* @author  (last)      Vijay Pamula
+* @date    (last)      28-Jul-2026
 *
 * @author  (original)  Sean Nash
 * @date    (original)  01-Aug-2024
@@ -71,6 +71,19 @@
     U32 maxDialRate;            ///< Maximum dialysate flow rate (in mL/min)
 } TREATMENT_PARAM_BROADCAST_PAYLOAD_T;
 
+/// Payload record structure for Pre-Treatment states broadcast.
+typedef struct
+{
+    U32 mSubMode;                   ///< Current Pre-Treatment state.
+    U32 mInstallState;              ///< Current Tube Set Install state.
+    U32 mSelfTestDryState;          ///< Current Dry Self-Test state.
+    U32 mPrimeState;                ///< Current Prime state.
+    U32 mRecirculateState;          ///< Current Pre-Treatment Recirculate state.
+    U32 mConfirmRxState;            ///< Current Confirm Rx state.
+    U32 mHeparinState;              ///< Current Heparin Setup state.
+    U32 mPatientConnectionState;    ///< Current Patient Connection state.
+} PRE_TREATMENT_STATES_DATA_PAYLOAD_T;
+
 /// Institutional record structure containing treatment parameter range limits.
 typedef struct
 {