Implement synchronized LED wall output

led_platform/cli.py

@@ -1,4 +1,5 @@
 import webbrowser
+import socket
 
 import typer
 import uvicorn
@@ -8,6 +9,16 @@ from led_platform.core.config import get_settings
 app = typer.Typer(help="LED wall projection platform CLI.")
 
 
+def _lan_base_url(port: int = 8000) -> str:
+    try:
+        with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as sock:
+            sock.connect(("8.8.8.8", 80))
+            host = sock.getsockname()[0]
+    except OSError:
+        host = "127.0.0.1"
+    return f"http://{host}:{port}"
+
+
 @app.command()
 def serve(
     host: str = typer.Option(None, help="Bind host."),
@@ -25,8 +36,9 @@ def serve(
 
 @app.command()
 def urls(
-    base: str = typer.Option("http://127.0.0.1:8000", help="Controller base URL."),
+    base: str = typer.Option(None, help="Controller base URL."),
 ) -> None:
+    base = base or _lan_base_url()
     typer.echo(f"Admin:       {base}/")
     typer.echo(f"Left output: {base}/output/left")
     typer.echo(f"Right output:{base}/output/right")