Add WiFi calibration warning

src/AutoPilotPlugins/APM/APMSensorsComponent.qml

@@ -169,6 +169,14 @@ QGCView {
         }
     }
 
+    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 }
 
     Component {

src/AutoPilotPlugins/APM/APMSensorsComponentController.cc

@@ -464,3 +464,8 @@ bool APMSensorsComponentController::accelSetupNeeded(void) const
 {
     return _sensorsComponent->accelSetupNeeded();
 }
+
+bool APMSensorsComponentController::usingUDPLink(void)
+{
+    return _vehicle->priorityLink()->getLinkConfiguration()->type() == LinkConfiguration::TypeUdp;
+}

src/AutoPilotPlugins/APM/APMSensorsComponentController.h

@@ -77,6 +77,7 @@ public:
     Q_INVOKABLE void calibrateAccel(void);
     Q_INVOKABLE void cancelCalibration(void);
     Q_INVOKABLE void nextClicked(void);
+    Q_INVOKABLE bool usingUDPLink(void);
 
     bool compassSetupNeeded(void) const;
     bool accelSetupNeeded(void) const;