Index: firmware/App/Modes/ModePreTreat.h
===================================================================
diff -u -r30f049651877229042e3f8700c8596e5b9a1e0f4 -rb6b733b8d1f25bc2dbe2a94c620cd80aa3ae06f7
--- firmware/App/Modes/ModePreTreat.h	(.../ModePreTreat.h)	(revision 30f049651877229042e3f8700c8596e5b9a1e0f4)
+++ firmware/App/Modes/ModePreTreat.h	(.../ModePreTreat.h)	(revision b6b733b8d1f25bc2dbe2a94c620cd80aa3ae06f7)
@@ -29,8 +29,22 @@
  *  @{
  */
 
-// ********** private function prototypes **********
+// ********** public definitions **********
 
+/// Payload record structure for a pre-treatment state message.
+typedef struct
+{
+    U32 preTreatmentSubMode;        ///< Current pre-treatment sub-mode
+    U32 sampleWaterState;           ///< Current sample water state
+    U32 noCartSelfTestsState;       ///< Current no cartridge self-tests state
+    U32 installState;               ///< Current disposable installation state
+    U32 drySelfTestsState;          ///< Current dry self-tests state
+    U32 primeState;                 ///< Current prime state
+    U32 patientConnectionState;     ///< Current patient connection state
+} PRE_TREATMENT_STATE_DATA_T;
+
+// ********** public function prototypes **********
+
 void initPreTreatmentMode( void );                                  // Initialize this module
 void transitionToPreTreatmentMode( void );                          // Prepares for transition to pre-treatment mode
 U32  execPreTreatmentMode( void );                                  // Execute the pre-treatment mode state machine (call from OperationModes)