Timer works, file often too large

SenzorDataCollectorApp/Sensors.swift

@@ -109,7 +109,6 @@ class SensorCollector: ObservableObject {
                             let altTimestampedTuple = (Int(Date().timeIntervalSince1970 * 1000), (x: rel_altitude, y: pressure, z: 0.0))
                             
                             DispatchQueue.main.async {
-                                // Append the sensor data to the correct MeasuringSensors instance in the activeSensorsList
                                 if let index = self.activeSensorsList.firstIndex(where: { $0.sensorName == Sensors.alt.rawValue }) {
                                     self.activeSensorsList[index].sensorData.append(altTimestampedTuple)
                                 }

SenzorDataCollectorApp/StartingView.swift

@@ -34,8 +34,10 @@ struct StartingView: View {
     //----------TIMER SETUP SETTINGS AND VARS -----------------------------------------------------
     @StateObject var customTimer : CustomTimer
     private let backgroundTaskIdentifier = "hu.itk.ppke.backgroundTask"
+    private let timer = Timer.publish(every: 1, on: .main, in: .common).autoconnect()
     
     //----------MEASURMENT SETUP AND VARS ---------------------------------------------------------
+    @State var demostart = false
     @State var sensorDetailSheetPresented = false
     @State var showingFilePicker = false
     @State var selectedFolder: URL?
@@ -58,6 +60,7 @@ struct StartingView: View {
                 //----------------------------- DEBUG VALUE DISPAY ---------------------------------
                 Text("Notification list: \(manager.timerIntervalValues.map { "\($0)" }.joined(separator: ", "))").opacity(debug ? 0 : 1)
                 Text("Next notification in: \(customTimer.timerStringValue)").opacity(debug ? 0 : 1)
+                
                 Text("\(manager.serverResponse)")
                     .padding().opacity(debug ? 0 : 1)
                 
@@ -95,9 +98,6 @@ struct StartingView: View {
                                 )
                         }
                     }
-                    
-                    
-                
                 Button("CreateDIR"){
                     createDirectory()
                 }.padding().opacity(debug ? 0 : 1)
@@ -198,10 +198,8 @@ struct StartingView: View {
                     
                     if manager.state == "Ready" {
                         createDirectory()
-                        setNextMeasurement()
-                        sensor.startAllRecording(motionManager: motionManager, altimeter: altimeter)
-                        customTimer.startTimer()
                         first_open = false
+                        demostart = true
                     }
                 } label: {
                     Text(manager.state != "Ready" ? "Get started" : manager.state)
@@ -218,10 +216,10 @@ struct StartingView: View {
                 
             })
             //----------------------------- TIMER REFRESH ---------------------------------
-            .onReceive(Timer.publish(every: 1, on: .main, in: .common).autoconnect()){
-                _ in
+            .onReceive(timer){ _  in
                 if customTimer.isStarted{
                     customTimer.updateTimer()
+                    print("Timer: \(customTimer.totalSeconds)")
                 }
             }
             //----------------------------- NOTIFICAION HANDELING ---------------------------------
@@ -231,9 +229,13 @@ struct StartingView: View {
                     sensor.stopAllRecording(motionManager: motionManager, altimeter: altimeter)
                     customTimer.stopTimer()
                     saveAllToJson()
+                    
                     setNextMeasurement()
-                    sensor.startAllRecording(motionManager: motionManager, altimeter: altimeter)
-                    customTimer.startTimer()
+                    if customTimer.totalSeconds != 0 {
+                        sensor.startAllRecording(motionManager: motionManager, altimeter: altimeter)
+                        customTimer.startTimer()
+                    }
+                    
                 }
                 Button("Stop", role: .destructive){
                     sensor.stopAllRecording(motionManager: motionManager, altimeter: altimeter)
@@ -241,6 +243,21 @@ struct StartingView: View {
                     saveAllToJson()
                 }
             }
+            //------------------ DEMO NOTIFICATION - MEASUREMENT STARTING ----------------------
+            .alert("Demo Alert - press start if you are ready to start!", isPresented: $demostart){
+                Button("Start",role: .cancel){
+                    sensor.stopAllRecording(motionManager: motionManager, altimeter: altimeter)
+                    customTimer.stopTimer()
+                    setNextMeasurement()
+                    if customTimer.totalSeconds != 0 {
+                        sensor.startAllRecording(motionManager: motionManager, altimeter: altimeter)
+                        customTimer.startTimer()
+                    }
+                }
+                Button("Stop", role: .destructive){
+                    first_open = true
+                }
+            }
         }
     }
     func saveAllToJson(){