v0.11dev

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CC-BY-SA-4.0.txt

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GPL-3.0.txt

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+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
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+    <program>  Copyright (C) <year>  <name of author>
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+
+The hypothetical commands `show w' and `show c' should show the appropriate
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+
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+<https://www.gnu.org/licenses/>.
+
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+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

LICENSE

@@ -1,232 +0,0 @@
-GNU GENERAL PUBLIC LICENSE
-Version 3, 29 June 2007
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-Copyright © 2007 Free Software Foundation, Inc. <https://fsf.org/>
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-12. No Surrender of Others' Freedom.
-If conditions are imposed on you (whether by court order, agreement or otherwise) that contradict the conditions of this License, they do not excuse you from the conditions of this License. If you cannot convey a covered work so as to satisfy simultaneously your obligations under this License and any other pertinent obligations, then as a consequence you may not convey it at all. For example, if you agree to terms that obligate you to collect a royalty for further conveying from those to whom you convey the Program, the only way you could satisfy both those terms and this License would be to refrain entirely from conveying the Program.
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-13. Use with the GNU Affero General Public License.
-Notwithstanding any other provision of this License, you have permission to link or combine any covered work with a work licensed under version 3 of the GNU Affero General Public License into a single combined work, and to convey the resulting work. The terms of this License will continue to apply to the part which is the covered work, but the special requirements of the GNU Affero General Public License, section 13, concerning interaction through a network will apply to the combination as such.
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-17. Interpretation of Sections 15 and 16.
-If the disclaimer of warranty and limitation of liability provided above cannot be given local legal effect according to their terms, reviewing courts shall apply local law that most closely approximates an absolute waiver of all civil liability in connection with the Program, unless a warranty or assumption of liability accompanies a copy of the Program in return for a fee.
-
-END OF TERMS AND CONDITIONS
-
-How to Apply These Terms to Your New Programs
-
-If you develop a new program, and you want it to be of the greatest possible use to the public, the best way to achieve this is to make it free software which everyone can redistribute and change under these terms.
-
-To do so, attach the following notices to the program. It is safest to attach them to the start of each source file to most effectively state the exclusion of warranty; and each file should have at least the “copyright” line and a pointer to where the full notice is found.
-
-     navpoint
-     Copyright (C) 2024  kj7rrv
-
-     This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
-
-     This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.
-
-     You should have received a copy of the GNU General Public License along with this program.  If not, see <https://www.gnu.org/licenses/>.
-
-Also add information on how to contact you by electronic and paper mail.
-
-If the program does terminal interaction, make it output a short notice like this when it starts in an interactive mode:
-
-     navpoint  Copyright (C) 2024  kj7rrv
-     This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
-     This is free software, and you are welcome to redistribute it under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate parts of the General Public License. Of course, your program's commands might be different; for a GUI interface, you would use an “about box”.
-
-You should also get your employer (if you work as a programmer) or school, if any, to sign a “copyright disclaimer” for the program, if necessary. For more information on this, and how to apply and follow the GNU GPL, see <https://www.gnu.org/licenses/>.
-
-The GNU General Public License does not permit incorporating your program into proprietary programs. If your program is a subroutine library, you may consider it more useful to permit linking proprietary applications with the library. If this is what you want to do, use the GNU Lesser General Public License instead of this License. But first, please read <https://www.gnu.org/philosophy/why-not-lgpl.html>.

README.md

@@ -1,31 +1,50 @@
-# Navpoint Desktop
+# Navpoint Desktop v0.11dev
 
-This is a simple Python program that will run two HTTP servers. One listens on
-the computer's local IP address (e.g. `192.168.x.x`), port 8888, to receive
-location updates from the [Navpoint
-Mobile](https://gallery.appinventor.mit.edu/?galleryid=2c18ee4d-4eed-452a-9228-de8e813820d1)
-Android app. The other listens on `127.0.0.1` (i.e. `localhost`), also on port
-8888, for connections from a digital globe program such as [Google Earth
-Pro](https://www.google.com/earth/about), allowing that program to track the
-user's location. (Navpoint is not developed or endorsed by Google.)
+[Navpoint](https://git.kj7rrv.com/kj7rrv/navpoint) makes the user's current
+location available in KML format over a local HTTP server (listening on
+`127.0.0.1`; external devices cannot connect). Its main purpose is to allow GPS
+tracking from a digital globe program such as [Google Earth
+Pro](https://www.google.com/earth/about). (Navpoint is not developed or
+endorsed by Google.)
 
-Navpoint Desktop has a minimal GUI consisting only of a QR code. Simply scan
-the code in Navpoint Mobile to establish a connection. The phone and computer
-must be on the same Wi-Fi network; if a router is not available, enabling
-mobile hotspot on the phone and connecting the computer to that network should
-work well. An Internet connection is not needed; Navpoint works over a LAN.
-
-Navpoint Desktop makes the geographic data available in KML format at
+Navpoint makes the geographic data available in KML format at
 `http://127.0.0.1:8888/navpoint.kml`. The `navpoint_link.kml` file in this
 repository contains a link to this URL configured to update every three
 seconds; simply open this file in Google Earth or another compatible program to
 connect to Navpoint Desktop.
 
+## Connection modes
+
+Navpoint can obtain location information from two different sources. The first,
+recommended where possible, is from a USB GPS receiver that supports the [NMEA
+0183](https://en.wikipedia.org/wiki/NMEA_0183) protocol. (A handheld GPS
+receiver connected to a computer may or may not work; it does not work with my
+Garmin GPSMAP 64st. Any common USB GPS dongle, such as [this one available from
+Amazon](https://www.amazon.com/VK-162-G-Mouse-External-Navigation-Raspberry/dp/B01EROIUEW/),
+should work, although, of course, I cannot guarantee that any particular device
+will be compatible with Navpoint. On Windows, USB mode should work
+out-of-the-box with a compatible GPS receiver; on Linux, your user account
+needs to be a member of the `dialout` group. If you get "Permission denied"
+errors from Navpoint, run `sudo usermod -a -G dialout $USER`, then log out and
+back in.
+
+Alternatively, you may use the [Navpoint
+Mobile](https://gallery.appinventor.mit.edu/?galleryid=2c18ee4d-4eed-452a-9228-de8e813820d1)
+Android app. This uses an Android phone's GPS receiver to obtain location data;
+however, it is typically less accurate than a USB module, and more likely to
+have problems. Navpoint Desktop runs a second HTTP server listening on the
+computer's local IP address (e.g. `192.168.x.x`), and the phone connects to
+this server and sends location updates via HTTP requests. If you want to use
+Navpoint Mobile, choose that option when opening Navpoint Desktop, then scan
+the QR code from Navpoint Mobile. (Make sure that your phone and computer are
+on the same Wi-Fi network, or that your phone's hotspot is on and your computer
+is connected to it.)
+
 ## Licensing
 
 Navpoint Desktop is released under the [GNU General Public License
 v3.0](https://www.gnu.org/licenses/gpl-3.0.en.html), except the files
-`navpoint/get_ip.py` and `navpoint.fix_path`, which are released under
+`navpoint/get_ip.py` and `navpoint/fix_path.py`, which are released under
 [Creative Commons Attribution-ShareAlike 4.0
 International](https://creativecommons.org/licenses/by-sa/4.0/) due to use of
 code published on Stack Overflow

build-linux.sh

@@ -1,33 +1,48 @@
 #!/bin/sh
 
-arch=$(uname -p)
-distDir=dist/navpoint-linux-$arch
+arch=$(uname -m)
+version=$(head -n 1 README.md | awk '{print $4}')
+distName=navpoint-$version-linux-$arch
 
-rm -rf $distDir
-mkdir $distDir
+rm -rf dist/$distName-*
+mkdir -p dist/$distName-bundle
 
-pyinstaller -w -F --hidden-import tornado.web main.py
+pyinstaller --windowed --onefile \
+    --hidden-import tornado.web \
+    --add-data README.md:files \
+    --add-data GPL-3.0.txt:files \
+    --add-data CC-BY-SA-4.0.txt:files \
+    main.py
 
-mv dist/main $distDir/navpoint
-cp icon.png $distDir/navpoint.png
+cp dist/main dist/$distName-standalone
+mv dist/main dist/$distName-bundle/navpoint
+cp icon.png dist/$distName-bundle/navpoint.png
 
-cat > $distDir/navpoint.desktop << HERE
+cp GPL-3.0.txt CC-BY-SA-4.0.txt dist/$distName-bundle/
+pandoc -s --metadata "title=Navpoint Desktop" README.md |
+    grep -v 'h1 id="navpoint-desktop"' \
+    > dist/$distName-bundle/README.html
+
+cat > dist/$distName-bundle/navpoint.desktop << HERE
 [Desktop Entry]
 Type=Application
 Terminal=false
 Name=Navpoint
 Exec=/bin/sh -c "$HOME/.local/bin/navpoint"
 Icon=navpoint
+Categories=Application;Network
 StartupWMClass=navpoint
 HERE
 
-cat > $distDir/install.sh << HERE
+cat > dist/$distName-bundle/install.sh << HERE
 #!/bin/sh
 
 binary_target=~/.local/bin/
 desktop_target=~/.local/share/applications/
 icon_target=~/.local/share/icons/
 
+mkdir -p \$binary_target \$desktop_target \$icon_target
+
 cp navpoint \$binary_target/navpoint
 chmod +x \$binary_target/navpoint
 
@@ -35,6 +50,8 @@ cp navpoint.desktop \$desktop_target/navpoint.desktop
 
 cp navpoint.png \$icon_target/navpoint.png
 HERE
-chmod +x $distDir/install.sh
+chmod +x dist/$distName-bundle/install.sh
 
-tar -czf $distDir.tar.gz $distDir
+cd dist
+
+tar -czf $distName-bundle.tar.gz $distName-bundle

build-windows.bat

@@ -1 +0,0 @@
-pyinstaller -i=icon.ico --windowed --onefile --hidden-import tornado.web --add-data icon.ico:files --name=navpoint-windows-%PROCESSOR_ARCHITECTURE%.exe main.py

build-windows.ps1

@@ -0,0 +1,12 @@
+$version = (Get-Content -Path README.md -TotalCount 1).Split()[3]
+$distName = "navpoint-$version-windows-$env:PROCESSOR_ARCHITECTURE"
+
+Remove-Item -Path "dist\$distName-*"
+
+pyinstaller --icon "icon.ico" --windowed --onefile --hidden-import "tornado.web" --add-data "icon.ico:files" --add-data "README.md:files" --add-data "GPL-3.0.txt:files" --add-data "CC-BY-SA-4.0.txt:files" --name "navpoint.exe" "main.py"
+
+(Get-Content ".\windows_installer.nsi" -Raw).Replace("<<version>>", "$version").Replace("<<distName>>", "$distName") | Out-File ".\temp_installer.nsi"
+& "C:\Program Files (x86)\NSIS\makensis.exe" ".\temp_installer.nsi"
+Remove-Item -Path ".\temp_installer.nsi"
+
+Move-Item -Path "dist\navpoint.exe" -Destination "dist\$distName-portable.exe"

navpoint/about.py

@@ -0,0 +1,62 @@
+import webbrowser
+import threading
+import asyncio
+import markdown
+import tornado.web
+import navpoint.fix_path
+
+class AboutHandler(tornado.web.RequestHandler):
+    def get(self):
+        with open(navpoint.fix_path.fix_path("README.md")) as f:
+            readme = markdown.markdown(
+                f.read()
+                .replace("https://www.gnu.org/licenses/gpl-3.0.en.html", "#gpl")
+                .replace(
+                    "https://creativecommons.org/licenses/by-sa/4.0/", "#cc"
+                )
+            )
+
+        with open(navpoint.fix_path.fix_path("GPL-3.0.txt")) as f:
+            gpl = f.read()
+
+        with open(navpoint.fix_path.fix_path("CC-BY-SA-4.0.txt")) as f:
+            cc = f.read()
+
+        self.write(
+            f"""\
+<!DOCTYPE html>
+<html>
+    <head>
+        <title>Navpoint Desktop</title>
+    </head>
+    <body>
+        <a id="top"></a>{readme}
+        <h3 id="gpl">GNU General Public License v3.0</h3>
+        <p>If you are connected to the Internet, this license is also available <a href="https://www.gnu.org/licenses/gpl-3.0.en.html">on the GNU Web site</a>.</p>
+        <pre>{gpl}</pre>
+        <p id="cc"><a href="#top">Back to top</a></p>
+        <h3>Creative Commons Attribution-ShareAlike 4.0 International</h3>
+        <p>If you are connected to the Internet, this license, along with a more easily-readable summary, is available <a href="https://creativecommons.org/licenses/by-sa/4.0/">on the Creative Commons Web site</a>.</p>
+        <pre>{cc}</pre>
+        <p><a href="#top">Back to top</a></p>
+    </body>
+</html>
+"""
+        )
+
+
+async def _run():
+    app = tornado.web.Application(
+        [
+            ("/", AboutHandler),
+        ]
+    )
+    app.listen(9999, address="127.0.0.1")
+    await asyncio.Event().wait()
+
+def run_server():
+    threading.Thread(target=asyncio.run, args=(_run(),), daemon=True).start()
+
+
+def about():
+    webbrowser.open("http://127.0.0.1:9999/")

navpoint/fix_path.py

@@ -9,8 +9,9 @@
 import sys
 import os.path
 
+
 def fix_path(path):
-    if getattr(sys, 'frozen', False):
+    if getattr(sys, "frozen", False):
         return os.path.join(sys._MEIPASS, "files", path)
     else:
         return path

navpoint/gui.py

@@ -1,28 +0,0 @@
-import tkinter as tk
-import pyqrcode
-import navpoint.fix_path
-
-
-def run(link):
-    window = tk.Tk(className="navpoint")
-    window.title("Navpoint")
-    window.resizable(width=False, height=False)
-
-    label = tk.Label(window, text="QR code here...")
-    label.pack()
-
-    image = tk.BitmapImage(
-        data=pyqrcode.create(link).xbm(scale=int(window.winfo_fpixels("2m")))
-    )
-    image.config(background="white")
-    image.config(foreground="black")
-
-    label.config(image=image)
-
-    try:
-        window.iconbitmap(navpoint.fix_path.fix_path("icon.ico"))
-    except tk.TclError:
-        pass
-
-
-    window.mainloop()

navpoint/intercom.py

@@ -0,0 +1,34 @@
+import queue
+
+
+class Intercom:
+    def __init__(self, window, handler):
+        self.window = window
+        self.queue = queue.Queue()
+        self.handler = handler
+
+        self.window.bind("<<intercom>>", self._event)
+
+    def clear(self):
+        try:
+            while True:
+                self.queue.get(block=False)
+        except queue.Empty:
+            pass
+
+    def put(self, purpose, content):
+        self.queue.put(
+            (
+                purpose,
+                content,
+            )
+        )
+        self.window.event_generate("<<intercom>>", when="tail", state=1)
+
+    def _event(self, event):
+        try:
+            purpose, content = self.queue.get(block=False)
+        except queue.Empty:
+            return
+
+        self.handler(purpose, content)

navpoint/local_server.py

@@ -1,6 +1,7 @@
 import threading
 import asyncio
-import tornado
+import base64
+import tornado.web
 import navpoint.content
 
 
@@ -9,10 +10,20 @@ class GetHandler(tornado.web.RequestHandler):
         self.write(navpoint.content.content)
 
 
+class ImageHandler(tornado.web.RequestHandler):
+    def get(self):
+        self.write(
+            base64.b64decode(
+                "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"
+            )
+        )
+
+
 async def main():
     app = tornado.web.Application(
         [
             (r"/navpoint.kml", GetHandler),
+            (f"/marker.png", ImageHandler),
         ]
     )
     app.listen(8888, address="127.0.0.1")

navpoint/phone_server.py

@@ -1,9 +1,13 @@
-import tornado
+import tornado.web
 import navpoint.get_ip
 import navpoint.content
 import asyncio
 import secrets
 import threading
+import tkinter as tk
+from tkinter import ttk
+import pyqrcode
+import navpoint.fix_path
 
 
 class PostHandler(tornado.web.RequestHandler):
@@ -14,6 +18,12 @@ class PostHandler(tornado.web.RequestHandler):
 
     def post(self):
         navpoint.content.content = self.request.body
+        intercom.put(
+            "Updated",
+            navpoint.content.content.decode("utf-8")
+            .split("<description>")[1]
+            .split("</description>")[0],
+        )
         self.write("Navpoint")
 
 
@@ -32,8 +42,41 @@ def run_in_thread(ip, token):
 
 
 def run():
+    def new_data(purpose, content):
+        if purpose == "Updated":
+            updated.config(text="Last updated: " + content)
+
     ip = navpoint.get_ip.get_ip()
     token = secrets.token_urlsafe()
+
+    link = f"http://{ip}:8888/{token}"
+
+    window = tk.Tk(className="navpoint")
+    window.title("Navpoint")
+    window.resizable(width=False, height=False)
+
+    label = tk.Label(window, text="QR code here...")
+    label.pack()
+
+    updated = ttk.Label(window, text="Waiting for location")
+    updated.pack()
+
+    image = tk.BitmapImage(
+        data=pyqrcode.create(link).xbm(scale=int(window.winfo_fpixels("2m")))
+    )
+    image.config(background="white")
+    image.config(foreground="black")
+
+    label.config(image=image)
+
+    try:
+        window.iconbitmap(navpoint.fix_path.fix_path("icon.ico"))
+    except tk.TclError:
+        pass
+
+    global intercom
+    intercom = navpoint.intercom.Intercom(window, new_data)
+
     threading.Thread(
         target=run_in_thread,
         args=(
@@ -43,4 +86,4 @@ def run():
         daemon=True,
     ).start()
 
-    return f"http://{ip}:8888/{token}"
+    window.mainloop()

navpoint/run.py

@@ -1,8 +1,60 @@
+import tkinter as tk
+from tkinter import ttk
+import navpoint.fix_path
 import navpoint.local_server
 import navpoint.phone_server
-import navpoint.gui
+import navpoint.usb
+import navpoint.about
+
+def _version():
+    with open(navpoint.fix_path.fix_path("README.md")) as f:
+        return f.readline().split()[3]
 
 def run():
-    navpoint.local_server.run()
-    link = navpoint.phone_server.run()
-    navpoint.gui.run(link)
+    def _usb_clicked():
+        window.destroy()
+        global mode
+        mode = "usb"
+
+    def _mobile_clicked():
+        window.destroy()
+        global mode
+        mode = "mobile"
+
+    window = tk.Tk(className="navpoint")
+    window.title("Navpoint")
+    window.resizable(width=False, height=False)
+
+    global mode
+    mode = ""
+
+    ttk.Label(window, text="How should Navpoint obtain location data?").pack()
+    usb_button = ttk.Button(
+        window, text="USB GPS receiver (NMEA)", command=_usb_clicked
+    )
+    usb_button.pack()
+    mobile_button = ttk.Button(
+        window, text="Phone running Navpoint Mobile", command=_mobile_clicked
+    )
+    mobile_button.pack()
+    ttk.Separator(window, orient="horizontal").pack(fill="x", pady=3)
+    ttk.Label(window, text="Navpoint is free and open-source.").pack()
+    about_button = ttk.Button(
+        window, text="About Navpoint " + _version(), command=navpoint.about.about
+    )
+    about_button.pack()
+
+    try:
+        window.iconbitmap(navpoint.fix_path.fix_path("icon.ico"))
+    except tk.TclError:
+        pass
+
+    navpoint.about.run_server()
+    window.mainloop()
+
+    if mode == "mobile":
+        navpoint.local_server.run()
+        link = navpoint.phone_server.run()
+    elif mode == "usb":
+        navpoint.local_server.run()
+        navpoint.usb.run_ui()

navpoint/usb.py

@@ -0,0 +1,126 @@
+import threading
+import queue
+import tkinter as tk
+from tkinter import ttk
+from tkinter import messagebox
+from serial import Serial
+from pynmeagps import NMEAReader
+import serial.tools.list_ports
+import serial.serialutil
+import navpoint.content
+import navpoint.fix_path
+import navpoint.intercom
+
+
+def main(port, intercom):
+    try:
+        with Serial(port, timeout=3) as stream:
+            reader = NMEAReader(stream)
+            intercom.put(
+                "Connected",
+                port,
+            )
+
+            while True:
+                _, parsed_data = reader.read()
+                try:
+                    lat = parsed_data.lat
+                    lon = parsed_data.lon
+                    time = parsed_data.time
+                    date = parsed_data.date
+                    if lat or lon:  # ignore 0, 0 fixes
+                        navpoint.content.content = f"""<?xml version='1.0' encoding='us-ascii'?><kml xmlns="http://www.opengis.net/kml/2.2" xmlns:gx="http://www.google.com/kml/ext/2.2"><Document><Style id="icon"><IconStyle><Icon><href>http://127.0.0.1:8888/marker.png</href></Icon></IconStyle></Style><name>Navpoint</name><open>1</open><Placemark><name>Position</name><styleUrl>#icon</styleUrl><Point><coordinates>{lon},{lat},0</coordinates></Point><description>{date} {time} UTC</description></Placemark></Document></kml>"""
+                        intercom.put(
+                            "LocationUpdate",
+                            {
+                                "lat": lat,
+                                "lon": lon,
+                                "time": f"{date} {time} UTC",
+                            },
+                        )
+
+                except AttributeError:
+                    pass
+    except serial.serialutil.SerialException as e:
+        intercom.put(
+            "Disconnected",
+            port,
+        )
+        messagebox.showerror(
+            "Navpoint Error", f"Error reading from port {port}: {str(e)}"
+        )
+
+
+def run(port, intercom):
+    threading.Thread(target=main, args=(port, intercom), daemon=True).start()
+
+
+def clear(queue_to_clear):
+    try:
+        while True:
+            queue_to_clear.get(block=False)
+    except queue.Empty:
+        pass
+
+
+def update_dropdown(dropdown):
+    dropdown["values"] = ["[Select port]"] + [
+        f"{port.device}: {port.description}"
+        for port in serial.tools.list_ports.comports()
+    ]
+    dropdown.current(newindex=0)
+
+
+def run_ui():
+    def selected(event):
+        selection = dropdown.get().split(": ", 1)[0]
+        if not selection.startswith("["):
+            intercom.clear()
+            run(selection, intercom)
+
+    def new_data(purpose, content):
+        if purpose == "LocationUpdate":
+            updated.config(text="Last updated: " + content["time"])
+        elif purpose == "Connected":
+            status.config(text="Connected to " + dropdown.get())
+            dropdown.pack_forget()
+            refresh.pack_forget()
+        elif purpose == "Disconnected":
+            status.config(text="Not connected")
+            update_dropdown(dropdown)
+            dropdown.pack()
+            refresh.pack()
+
+    def refresh_clicked():
+        update_dropdown(dropdown)
+
+    window = tk.Tk(className="navpoint")
+    window.title("Navpoint")
+    window.resizable(width=False, height=False)
+
+    status = ttk.Label(window, text="Not connected")
+    status.pack()
+
+    updated = ttk.Label(window, text="Waiting for location")
+    updated.pack()
+
+    n = tk.StringVar()
+    dropdown = ttk.Combobox(window, state="readonly", textvariable=n, width=40)
+    update_dropdown(dropdown)
+    dropdown.pack()
+
+    refresh = ttk.Button(
+        window, text="Refresh device list", command=refresh_clicked
+    )
+    refresh.pack()
+
+    dropdown.bind("<<ComboboxSelected>>", selected)
+
+    intercom = navpoint.intercom.Intercom(window, new_data)
+
+    try:
+        window.iconbitmap(navpoint.fix_path.fix_path("icon.ico"))
+    except tk.TclError:
+        pass
+
+    window.mainloop()

requirements.txt

@@ -1,2 +1,5 @@
 pyqrcode
 tornado
+pyserial
+pynmeagps
+markdown

windows_installer.nsi

@@ -0,0 +1,23 @@
+Name "Navpoint <<version>>"
+OutFile "dist\<<distName>>-installer.exe"
+InstallDir $PROFILE\Navpoint
+
+RequestExecutionLevel user
+
+Section
+    # set the installation directory as the destination for the following actions
+    SetOutPath $INSTDIR
+
+    File dist\navpoint.exe
+    CreateShortcut "$SMPROGRAMS\Navpoint.lnk" "$INSTDIR\navpoint.exe"
+    CreateShortcut "$DESKTOP\Navpoint.lnk" "$INSTDIR\navpoint.exe"
+ 
+    WriteUninstaller "$INSTDIR\uninstall.exe"
+    CreateShortcut "$SMPROGRAMS\Uninstall Navpoint.lnk" "$INSTDIR\uninstall.exe"
+SectionEnd
+ 
+Section "uninstall"
+    Delete "$SMPROGRAMS\Uninstall Navpoint.lnk"
+    Delete $INSTDIR\uninstaller.exe
+    RMDir $INSTDIR
+SectionEnd