Expanded documentation for UASInfoWidget::update*Loss.

Changed the drop rate from a SYS_STATUS message to follow the MAVLink specs along with some extra range checking.

src/uas/UAS.cc

@@ -428,9 +428,15 @@ void UAS::receiveMessage(LinkInterface* link, mavlink_message_t message)
                     stopLowBattAlarm();
                 }
 
-                // COMMUNICATIONS DROP RATE
-                // FIXME
-                emit dropRateChanged(this->getUASID(), state.drop_rate_comm/10000.0f);
+                // Trigger drop rate updates as needed. Here we convert the incoming
+				// drop_rate_comm value from 1/100 of a percent in a uint16 to a true
+				// percentage as a float. We also cap the incoming value at 100% as defined
+				// by the MAVLink specifications.
+				if (state.drop_rate_comm > 10000) {
+				    emit dropRateChanged(this->getUASID(), 100.0f);
+				} else {
+				    emit dropRateChanged(this->getUASID(), state.drop_rate_comm/100.0f);
+				}
             }
             break;
         case MAVLINK_MSG_ID_ATTITUDE:

src/ui/uas/UASInfoWidget.h

@@ -57,10 +57,20 @@ public slots:
 
     void updateBattery(UASInterface* uas, double voltage, double percent, int seconds);
     void updateCPULoad(UASInterface* uas, double load);
-    /** @brief Set the loss rate of packets received by the MAV */
+    /** 
+	 * @brief Set the loss rate of packets received by the MAV.
+	 * @param uasId UNUSED
+	 * @param receiveLoss A percentage value (0-100) of how many message the UAS has failed to receive.
+	 */
     void updateReceiveLoss(int uasId, float receiveLoss);
-    /** @brief Set the loss rate of packets sent from the MAV */
+
+    /**
+	 * @brief Set the loss rate of packets sent from the MAV 
+	 * @param uasId UNUSED
+	 * @param sendLoss A percentage value (0-100) of how many message QGC has failed to receive.
+	 */
     void updateSendLoss(int uasId, float sendLoss);
+	
     /** @brief Update the error count */
     void updateErrorCount(int uasid, QString component, QString device, int count);