UASControlWidget: add the option to select the OFFBOARD mode

src/ui/uas/UASControlWidget.cc

@@ -52,7 +52,7 @@ static struct full_mode_s modes_list_common[] = {
             0 },
 };
 
-static struct full_mode_s modes_list_px4[4];
+static struct full_mode_s modes_list_px4[5];
 
 UASControlWidget::UASControlWidget(QWidget *parent) : QWidget(parent),
     uasID(-1),
@@ -88,6 +88,9 @@ void UASControlWidget::updateModesList()
     modes_list_px4[3].baseMode = MAV_MODE_FLAG_CUSTOM_MODE_ENABLED | MAV_MODE_FLAG_AUTO_ENABLED | MAV_MODE_FLAG_STABILIZE_ENABLED | MAV_MODE_FLAG_GUIDED_ENABLED;
     px4_cm.main_mode = PX4_CUSTOM_MAIN_MODE_AUTO;
     modes_list_px4[3].customMode = px4_cm.data;
+    modes_list_px4[4].baseMode = MAV_MODE_FLAG_CUSTOM_MODE_ENABLED | MAV_MODE_FLAG_AUTO_ENABLED | MAV_MODE_FLAG_STABILIZE_ENABLED | MAV_MODE_FLAG_GUIDED_ENABLED;
+    px4_cm.main_mode = PX4_CUSTOM_MAIN_MODE_OFFBOARD;
+    modes_list_px4[4].customMode = px4_cm.data;
 
     // Detect autopilot type
     int autopilot = 0;