Add in-app speaker discovery and connection guide

controller/ble_probe.py

@@ -3,18 +3,7 @@
 import argparse
 import asyncio
 
-# MX-T40 model advertisements from the Android APK's strings.xml. These
-# identify discovery records; they are not assumed to be writable services.
-MODEL_UUIDS = {
-    f"0000{short}-0000-1000-8000-00805f9b34fb" for short in ("ff40", "fe40", "ff41", "fe41")
-}
-
-
-def is_candidate(device, advertisement):
-    names = f"{device.name or ''} {advertisement.local_name or ''}".upper()
-    return "T40" in names or bool(
-        MODEL_UUIDS.intersection(value.lower() for value in advertisement.service_uuids)
-    )
+from controller.discovery import is_candidate
 
 
 async def inspect(timeout):