Added 2 kPA offset to pressure measurements to get HIL closer to real conditions

src/comm/MAVLinkSimulationLink.h

@@ -123,9 +123,10 @@ protected:
 
     void enqueue(uint8_t* stream, uint8_t* index, mavlink_message_t* msg);
 
-    static const uint8_t systemId = 220;
+    static const int8_t systemId = 220;
     static const uint8_t componentId = 200;
     static const uint16_t version = 1000;
+    static const unsigned int barometerOffsetkPa = 2;
 
 signals:
     void valueChanged(int uasId, QString curve, double value, quint64 usec);

src/comm/QGCXPlaneLink.cc

@@ -667,8 +667,8 @@ void QGCXPlaneLink::readBytes()
             /* current pressure at MSL in kPa */
             double p1 = 1013.25 / 10.0;
 
-            /* measured pressure in hPa */
-            double p = abs_pressure / 10.0;
+            /* measured pressure in hPa, plus offset to simulate weather effects / offsets */
+            double p = abs_pressure / 10.0 + barometerOffsetkPa;
 
             /*
              * Solve: