Implement dashboard port from environment variable ESPHOME_DASHBOARD_PORT

esphome/__main__.py

@@ -889,7 +889,7 @@ def parse_args(argv):
         "--port",
         help="The HTTP port to open connections on. Defaults to 6052.",
         type=int,
-        default=6052,
+        default=0,
     )
     parser_dashboard.add_argument(
         "--address",

esphome/dashboard/dashboard.py

@@ -137,9 +137,10 @@ async def async_start(args) -> None:
     await dashboard.async_setup()
     sock: socket.socket | None = args.socket
     address: str | None = args.address
-    port: int | None = args.port
 
-    start_web_server(make_app(args.verbose), sock, address, port, settings.config_dir)
+    start_web_server(
+        make_app(args.verbose), sock, address, settings.port, settings.config_dir
+    )
 
     if args.open_ui:
         import webbrowser

esphome/dashboard/settings.py

@@ -19,6 +19,7 @@ class DashboardSettings:
         "password_hash",
         "username",
         "using_password",
+        "port",
         "on_ha_addon",
         "cookie_secret",
         "absolute_config_dir",
@@ -31,6 +32,7 @@ class DashboardSettings:
         self.password_hash: str = ""
         self.username: str = ""
         self.using_password: bool = False
+        self.port: int = 6052
         self.on_ha_addon: bool = False
         self.cookie_secret: str | None = None
         self.absolute_config_dir: Path | None = None
@@ -45,6 +47,7 @@ class DashboardSettings:
             self.using_password = bool(password)
         if self.using_password:
             self.password_hash = password_hash(password)
+        self.port = args.port or os.getenv("ESPHOME_DASHBOARD_PORT") or 6052
         self.config_dir = args.configuration
         self.absolute_config_dir = Path(self.config_dir).resolve()
         self.verbose = args.verbose