add a route for '/'

server.py

 import flask
-import waitress
 from device import Device
 
 device = Device()
 app = flask.Flask(__name__)
 
 
+@app.route('/')
+def index():
+    return main('index.html')
+
+
 @app.route('/<path:path>')
 def main(path):
     return flask.send_from_directory('frontend/build/', path)
@@ -39,4 +43,5 @@ def resistance():
 
 
 if __name__ == '__main__':
+    import waitress
     waitress.serve(app, host='0.0.0.0', port=8000)