Restructure for better usability

gui/home/home.kv

@@ -0,0 +1,45 @@
+<HomeScreen>:
+    name: "home"
+    canvas.before:
+        Color:
+            rgba: (10,10,10,0.1)
+        Rectangle:
+            size: self.size
+            pos: self.pos
+    GridLayout:
+        cols:1
+        Label:
+            text: "BiogasanlageControllerApp"
+            font_size: 50
+            color: (0, 113, 0, 1)
+            bold:True
+            italic:True
+        FloatLayout:
+            GridLayout:
+                cols: 2
+                size_hint: 0.8, 0.8
+                pos_hint: {"x": 0.1, "y": 0.1}
+                Button:
+                    text: "Start"
+                    background_color: (255, 0, 0, 0.6)
+                    font_size: 30
+                    on_release:
+                        root.start()
+                Button:
+                    text: "Quit"
+                    background_color: (255, 0, 0, 0.6)
+                    font_size: 30
+                    on_release:
+                        root.quit()
+            Label:
+                text: "You are running version V3.0.0"
+                font_size: 13
+                pos_hint: {"y": -0.45, "x":0.05}
+            Button:
+                text: "About"
+                font_size: 13
+                size_hint: 0.07, 0.06
+                pos_hint: {"x":0.01, "y":0.01}
+                background_color: (50, 0, 0, 0.2)
+                on_release:
+                    root.to_about()

gui/home/home.py

@@ -0,0 +1,71 @@
+from kivy.uix.screenmanager import Screen
+from kivy.lang import Builder
+from gui.popups.popups import DualRowPopup, QuitPopup, TwoActionPopup
+from lib.com import ComSuperClass
+import platform
+
+
+# Information for errors encountered when using pyserial
+information = {
+    "Windows": {
+        "2": "Un- and replug the cable and ensure you have the required driver(s) installed",
+        "13": "You are probably missing a required driver or your cable doesn't work. Consult the wiki for more information",
+        "NO_COM": "Could not find a microcontroller. Please ensure you have one connected and the required driver(s) installed"
+    },
+    "Linux": {
+        "2": "Un- and replug the cable, or if you haven't plugged a controller in yet, do that",
+        "13": "Incorrect permissions at /dev/ttyUSB0. Open a terminal and type: sudo chmod 777 /dev/ttyUSB0",
+        "NO_COM": "Could not find a microcontroller. Please ensure you have one connected"
+    }
+}
+
+
+# This is the launch screen, i.e. what you see when you start up the app
+class HomeScreen(Screen):
+    def __init__(self, com: ComSuperClass, **kw):
+        self._com = com;
+        super().__init__(**kw)
+
+    # Go to the main screen if we can establish connection or the check was disabled 
+    # in the configs
+    def start(self):
+        if self._com.connect():
+            self.manager.current = 'main'
+            self.manager.transition.direction = 'right'
+        else:
+            TwoActionPopup().open('Failed to connect', 'Details', self.open_details_popup)
+            print('ERROR connecting')
+
+    # Open popup for details as to why the connection failed
+    def open_details_popup(self):
+        DualRowPopup().open("Troubleshooting tips", self._generate_help())
+
+    def _generate_help(self) -> str:
+        operating_system = platform.system()
+        if operating_system == "Windows" or operating_system == "Linux":
+            port = self._com.get_comport();
+            information["Linux"]["13"] = f"Incorrect permissions at {port}. Resolve by running 'sudo chmod 777 {port}'"
+            if port == "":
+                return information[operating_system]["NO_COM"]
+            err = self._com.get_error()
+            if err != None:
+                return information[operating_system][str(err.errno)]
+            else:
+                return "No error message available"
+        else:
+            return "You are running on an unsupported Operating System. No help available"
+
+    # Helper to open a Popup to ask user whether to quit or not
+    def quit(self):
+        QuitPopup(self._com).open()
+
+    # Switch to about screen
+    def to_about(self):
+        self.manager.current = 'about'
+        self.manager.transition.direction = 'down'
+
+
+# Load the design file for this screen (.kv files)
+# The path has to be relative to root of the app, i.e. where the biogascontrollerapp.py 
+# file is located
+Builder.load_file('./gui/home/home.kv')