Index: firmware/App/Services/Messaging.h
===================================================================
diff -u -r395522dffef1348e176564925656012f529c1910 -rf0ea13c1a9908920793be07a946dc366d2ab5019
--- firmware/App/Services/Messaging.h	(.../Messaging.h)	(revision 395522dffef1348e176564925656012f529c1910)
+++ firmware/App/Services/Messaging.h	(.../Messaging.h)	(revision f0ea13c1a9908920793be07a946dc366d2ab5019)
@@ -81,6 +81,18 @@
     F32 ufRate;                 ///< UF rate in mL.
 } UF_SETTINGS_CONFIRMATION_RESPONSE_PAYLOAD_T;
 
+/// Payload record structure for treatment duration validate request.
+typedef struct
+{
+    U32 duration;               ///< Requested treatment duration in minutes.
+} DURATION_VALIDATE_REQUEST_PAYLOAD_T;
+
+/// Payload record structure for treatment duration confirm request.
+typedef struct
+{
+    U32 duration;               ///< Confirmed treatment duration in minutes.
+} DURATION_CONFIRM_REQUEST_PAYLOAD_T;
+
 /// Payload record structure for treatment duration change response.
 typedef struct
 {
@@ -90,6 +102,50 @@
     F32 volume;                 ///< UF Volume in mL.
 } TREATMENT_TIME_CHANGE_RESPONSE_PAYLOAD_T;
 
+/// Payload record structure for treatment duration validate response.
+typedef struct
+{
+    BOOL accepted;              ///< Accepted/Rejected
+    U32 rejectionReason;        ///< Rejection reason if not accepted.
+    U32 duration;               ///< Treatment duration in minutes.
+    F32 ufVolumeGoal;           ///< UF volume goal in mL.
+    F32 ufRate;                 ///< UF rate in mL/min.
+} DURATION_VALIDATE_RESPONSE_PAYLOAD_T;
+
+/// Payload record structure for bolus volume change request.
+typedef struct
+{
+    U32 bolusVolume;   ///< Requested bolus volume (in mL)
+} BOLUS_VOLUME_CHANGE_REQUEST_PAYLOAD_T;
+
+/// Payload record structure for bolus volume change response.
+typedef struct
+{
+    BOOL accepted;              ///< Accepted/Rejected
+    U32 rejectionReason;        ///< Rejection reason if not accepted
+    U32 bolusVolume;            ///< Bolus volume (in mL)
+} BOLUS_VOLUME_CHANGE_RESPONSE_PAYLOAD_T;
+
+/// Payload record structure for pressure limit change request.
+typedef struct
+{
+    S32 arterialPressureLimitWindowMMHG;             ///< Arterial pressure limit window in mmHg.
+    S32 venousPressureLimitWindowMMHG;               ///< Venous pressure limit window in mmHg.
+    S32 venousAsymmetricPressureLimitWindowMMHG;     ///< Venous asymmetric pressure limit window in mmHg.
+    S32 tmpPressureLimitWindowMMHG;                  ///< TMP pressure limit window in mmHg.
+} PRESSURE_LIMIT_CHANGE_REQUEST_T;
+
+/// Payload record structure for pressure limit change response.
+typedef struct
+{
+    BOOL accepted;                                   ///< Accepted/Rejected
+    U32 rejectionReason;                             ///< Rejection reason if not accepted.
+    S32 arterialPressureLimitWindowMMHG;             ///< Arterial pressure limit window in mmHg.
+    S32 venousPressureLimitWindowMMHG;               ///< Venous pressure limit window in mmHg.
+    S32 venousAsymmetricPressureLimitWindowMMHG;     ///< Venous asymmetric pressure limit window in mmHg.
+    S32 tmpPressureLimitWindowMMHG;                  ///< TMP pressure limit window in mmHg.
+} PRESSURE_LIMIT_CHANGE_RESPONSE_T;
+
 /// Payload record structure for blood / dialysate rate change response.
 typedef struct
 {