Warn used about sensor cal over WiFi

src/AutoPilotPlugins/PX4/SensorsComponent.qml

@@ -138,6 +138,15 @@ QGCView {
                 hideDialog()
             }
         }
+
+    }
+
+    Component.onCompleted: {
+        var usingUDP = controller.usingUDPLink()
+        if (usingUDP) {
+            console.log("onUsingUDPLink")
+            showMessage("Sensor Calibration", "Performing sensor calibration over a WiFi connection is known to be unreliable. You should disconnect and perform calibration using a direct USB connection instead.", StandardButton.Ok)
+        }
     }
 
     QGCPalette { id: qgcPal; colorGroupEnabled: panel.enabled }

src/AutoPilotPlugins/PX4/SensorsComponentController.cc

@@ -74,7 +74,11 @@ SensorsComponentController::SensorsComponentController(void) :
     _unknownFirmwareVersion(false),
     _waitingForCancel(false)
 {
+}
 
+bool SensorsComponentController::usingUDPLink(void)
+{
+    return _vehicle->priorityLink()->getLinkConfiguration()->type() == LinkConfiguration::TypeUdp;
 }
 
 /// Appends the specified text to the status log area in the ui

src/AutoPilotPlugins/PX4/SensorsComponentController.h

@@ -95,6 +95,7 @@ public:
     Q_INVOKABLE void calibrateLevel(void);
     Q_INVOKABLE void calibrateAirspeed(void);
     Q_INVOKABLE void cancelCalibration(void);
+    Q_INVOKABLE bool usingUDPLink(void);
     
     bool fixedWing(void);