use nightscout port number if available for missing cases

- use the server port number if available when pulling from /api/v1/entries endpoint
- use the server port number if available to check connection at /api/v1/experiments/test
- fixes JohanDegraeve#400

xdrip/Managers/NightScout/Endpoint+NightScout.swift

@@ -9,6 +9,8 @@ extension Endpoint {
     /// - parameters:
     ///     - hostAndScheme : hostname, eg http://www.mysite.com or https://www.mysite.com - must include the scheme - IF HOST DOESN'T START WITH A KNOWN SCHEME, THEN A FATAL ERROR WILL BE THROWN - known scheme's can be found in type EndPointScheme
     ///     - count : maximum number of readings to get
+    ///     - token: the Nightscout token used for authentication (optional)
+    ///     - port: Nightscout server port number (optional)
     static func getEndpointForLatestNSEntries(hostAndScheme:String, count: Int, token: String?) -> Endpoint {
 
         // split hostAndScheme in host and scheme
@@ -30,10 +32,11 @@ extension Endpoint {
         }
 
         return Endpoint(
-            host:host,
-            scheme:scheme!,
+            host: host,
+            scheme: scheme!,
             path: "/api/v1/entries/sgv.json",
-            queryItems: queryItems
+            queryItems: queryItems,
+            port: UserDefaults.standard.nightScoutPort
         )
     }
 }

xdrip/Utilities/Network/Endpoint.swift

@@ -17,6 +17,9 @@ struct Endpoint {
     /// array of URLQueryItem
     let queryItems: [URLQueryItem]
 
+    /// the Nightscout server port number
+    let port: Int
+
     /// gets url
     var url: URL? {
         var components = URLComponents()
@@ -25,6 +28,11 @@ struct Endpoint {
         components.path = path
         components.queryItems = queryItems
 
+        // add the port number component only if it exists (this avoids URLComponents adding a port number of 0 as port number is stored as non-optional integer in UserDefaults)
+        if port != 0 {
+            components.port = port
+        }
+
         return components.url
     }
 }

xdrip/View Controllers/SettingsNavigationController/SettingsViewController/SettingsViewModels/SettingsViewNightScoutSettingsViewModel.swift

@@ -57,7 +57,12 @@ class SettingsViewNightScoutSettingsViewModel {
     private func testNightScoutCredentials() {
 
         // unwrap siteUrl and apiKey
-        guard let siteUrl = UserDefaults.standard.nightScoutUrl else {return}
+        guard var siteUrl = UserDefaults.standard.nightScoutUrl else {return}
+
+        // add port number if it exists
+        if UserDefaults.standard.nightScoutPort != 0 {
+            siteUrl += ":" + UserDefaults.standard.nightScoutPort.description
+        }
 
         if let url = URL(string: siteUrl) {