Index: firmware/App/Services/SystemCommMessages.c
===================================================================
diff -u -r44cc25461e4936f7928904640c87a03ef7cf3c16 -rdaf8d5b60c753becab80cbaf164aac0e49d533a2
--- firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision 44cc25461e4936f7928904640c87a03ef7cf3c16)
+++ firmware/App/Services/SystemCommMessages.c	(.../SystemCommMessages.c)	(revision daf8d5b60c753becab80cbaf164aac0e49d533a2)
@@ -51,23 +51,24 @@
 
 typedef struct
 {
-    U32 alarmState;                             // 0 = no alarms, 1 = low priority, 2 = medium priority, 3 = high priority
-    U32 alarmTop;                               // ID of top active alarm
-    U32 escalatesIn;                            // seconds
-    U32 silenceExpiresIn;                       // seconds
-    U16 alarmsFlags;                            // bit flags: 1 = true, 0 = false for each bit
+    U32 alarmState;                             //< 0 = no alarms, 1 = low priority, 2 = medium priority, 3 = high priority
+    U32 alarmTop;                               //< ID of top active alarm
+    U32 escalatesIn;                            //< seconds
+    U32 silenceExpiresIn;                       //< seconds
+    U16 alarmsFlags;                            //< bit flags: 1 = true, 0 = false for each bit
 } ALARM_COMP_STATUS_PAYLOAD_T;
-
+
+/// DG version data
 typedef struct
 {
-    U08 major;
-    U08 minor;
-    U08 micro;
-    U16 build;
-    U08 fpgaId;
-    U08 fpgaMajor;
-    U08 fpgaMinor;
-    U08 fpgaLab;
+    U08 major;      ///< Major
+    U08 minor;      ///< Minor
+    U08 micro;      ///< Micro
+    U16 build;      ///< Build number
+    U08 fpgaId;     ///< FPGA ID
+    U08 fpgaMajor;  ///< FPGA major
+    U08 fpgaMinor;  ///< FPGA minor
+    U08 fpgaLab;    ///< FPGA lab
 } DG_VERSIONS_T;
 
 typedef struct
@@ -84,21 +85,23 @@
     F32 loadCellB1inGram;
     F32 loadCellB2inGram;
 } LOAD_CELL_DATA_T;
-
+
+/// RO pump data
 typedef struct
 {
-    F32 roPumpTgtPressure;
-    F32 measROFlowRate;
-    F32 roPumpPWM;
-    U32 roPumpState;
+    F32 roPumpTgtPressure;  ///< RO pump target pressure
+    F32 measROFlowRate;     ///< RO pump measured flow rate
+    F32 roPumpPWM;          ///< RO pump PWM duty cycle
+    U32 roPumpState;        ///< RO pump current state
 } RO_PUMP_DATA_T;
-
+
+/// Drain pump data
 typedef struct
 {
-    U32 setDrainPumpSpeed;
-    U32 dacValue;
-    F32 deltaPressure;
-    U32 drainPState;
+    U32 setDrainPumpSpeed;  ///< Drain pump set speed
+    U32 dacValue;           ///< Drain pump DAC value
+    F32 deltaPressure;      ///< Drain pump delta pressure
+    U32 drainPState;        ///< Drain pump state
 } DRAIN_PUMP_DATA_T;
 
 typedef struct
@@ -115,25 +118,28 @@
     U32 fillToVolumeMl;
     U32 drainToVolumeMl;
 } RESERVOIR_DATA_T;
-
+
+/// Target temperature of the heaters data
 typedef struct
 {
-    F32 targetPrimaryHeaterTemp;
-    F32 targetTrimmerHeaterTemp;
+    F32 targetPrimaryHeaterTemp;    ///< Target primary heater temperature
+    F32 targetTrimmerHeaterTemp;    ///< Target trimmer heater temperature
 } TARGET_TEMPS_PAYLOAD_T;
-
+
+/// Heaters data
 typedef struct
 {
-    U32 mainPrimayHeaterDC;
-    U32 smallPrimaryHeaterDC;
-    U32 trimmerHeaterDC;
+    U32 mainPrimayHeaterDC;    ///< Main primary heater duty cycle
+    U32 smallPrimaryHeaterDC;  ///< Small primary heater duty cycle
+    U32 trimmerHeaterDC;       ///< Trimmer heater duty cycle
 } HEATERS_DATA_T;
 
+/// Heat disinfect data
 typedef struct
 {
-    U32 internalState;
-    F32 elapsedTimeMins;
-    U32 currentCycle;
+    U32 internalState;       ///< Internal state of heat disinfect state machine
+    F32 elapsedTimeMins;     ///< Heat disinfect elapsed time in minutes
+    U32 currentCycle;        ///< Current cycle of the heat disinfect
 } DG_HEAT_DISINFECT_DATA_T;
 
 #pragma pack(pop)