Add time file handling

mission/devices/devicedefinitions/GPSDefinitions.h

@@ -6,6 +6,19 @@
 
 namespace GpsHyperion {
 
+enum class FixMode: uint8_t {
+  NOT_SEEN = 0,
+  NO_FIX = 1,
+  FIX_2D = 2,
+  FIX_3D = 3,
+  UNKNOWN = 4
+};
+
+static constexpr uint8_t SUBSYSTEM_ID = SUBSYSTEM_ID::GPS_HANDLER;
+//! [EXPORT] : [COMMENT] Fix has changed. P1: Old fix. P2: New fix
+//! 0: Not seen, 1: No Fix, 2: 2D-Fix, 3: 3D-Fix
+static constexpr Event GPS_FIX_CHANGE = event::makeEvent(SUBSYSTEM_ID, 0, severity::INFO);
+
 static constexpr DeviceCommandId_t GPS_REPLY = 0;
 static constexpr DeviceCommandId_t TRIGGER_RESET_PIN = 5;