Reduce network calls with stale data

- If BG is >= 10 min old, we're only going to try and load BG and Loop status, ignoring basal, bolus, and carbs. This greatly reduces the stutters and lags of attempting to reload all information every 15 seconds during sensor warmup or sensor outages.

LoopFollow/Controllers/NightScout.swift

@@ -49,9 +49,13 @@ extension MainViewController {
     func nightscoutLoader(forceLoad: Bool = false) {
         
         var needsLoaded: Bool = false
+        var staleData: Bool = false
         var onlyPullLastRecord = false
         
         // If we have existing data and it's within 5 minutes, we aren't going to do a BG network call
+        // if we have stale BG data 10 min or older, we're only going to attempt to pull BG and Loop status
+        // to not have a full refresh every 15 seconds. The remaining data will start pulling again on the
+        // next BG reading that comes in.
         if bgData.count > 0 {
             let now = NSDate().timeIntervalSince1970
             let lastReadingTime = bgData[bgData.count - 1].date
@@ -60,30 +64,37 @@ extension MainViewController {
                 needsLoaded = true
                 if secondsAgo < 10*60 {
                     onlyPullLastRecord = true
+                } else {
+                    staleData = true
                 }
             }
         } else {
             needsLoaded = true
         }
         
+        
         if forceLoad { needsLoaded = true}
         // Only update if we don't have a current reading or forced to load
         if needsLoaded {
             self.clearLastInfoData()
             webLoadNSDeviceStatus()
             webLoadNSBGData(onlyPullLastRecord: onlyPullLastRecord)
-            webLoadNSProfile()
-            if UserDefaultsRepository.downloadBasal.value {
-                WebLoadNSTempBasals()
-            }
-            if UserDefaultsRepository.downloadBolus.value {
-                webLoadNSBoluses()
-            }
-            if UserDefaultsRepository.downloadCarbs.value {
-                webLoadNSCarbs()
+            
+            if !staleData {
+                webLoadNSProfile()
+                if UserDefaultsRepository.downloadBasal.value {
+                    WebLoadNSTempBasals()
+                }
+                if UserDefaultsRepository.downloadBolus.value {
+                    webLoadNSBoluses()
+                }
+                if UserDefaultsRepository.downloadCarbs.value {
+                    webLoadNSCarbs()
+                }
+                webLoadNSCage()
+                webLoadNSSage()
             }
-            webLoadNSCage()
-            webLoadNSSage()
+            
             
             // Give the alarms and calendar 15 seconds delay to allow time for data to compile
             print("Start View Timer")
@@ -93,15 +104,15 @@ extension MainViewController {
             // Leaving all downloads off for right now.
             /*
              webLoadNSDeviceStatus()
-            
-            if UserDefaultsRepository.downloadBolus.value {
+             
+             if UserDefaultsRepository.downloadBolus.value {
                 webLoadNSBoluses()
-            }
-            if UserDefaultsRepository.downloadCarbs.value {
+             }
+             if UserDefaultsRepository.downloadCarbs.value {
                 webLoadNSCarbs()
-            }*/
+             }*/
             if bgData.count > 0 {
-                           self.checkAlarms(bgs: bgData)
+                self.checkAlarms(bgs: bgData)
             }
             
         }