add features

fichero/printer.py

@@ -12,6 +12,7 @@ from collections.abc import AsyncGenerator
 from contextlib import asynccontextmanager
 
 from bleak import BleakClient, BleakGATTCharacteristic, BleakScanner
+from bleak.exc import BleakDBusError, BleakError
 
 # --- RFCOMM (Classic Bluetooth) support - Linux + Windows (Python 3.9+) ---
 
@@ -374,7 +375,17 @@ async def connect(
             yield pc
     else:
         addr = address or await find_printer()
-        async with BleakClient(addr) as client:
-            pc = PrinterClient(client)
-            await pc.start()
-            yield pc
+        try:
+            async with BleakClient(addr) as client:
+                pc = PrinterClient(client)
+                await pc.start()
+                yield pc
+        except BleakDBusError as exc:
+            if "br-connection-not-supported" in str(exc).lower():
+                raise PrinterError(
+                    "BLE connection failed (br-connection-not-supported). "
+                    "Try Classic Bluetooth with classic=true and channel=1."
+                ) from exc
+            raise PrinterError(f"BLE connection failed: {exc}") from exc
+        except BleakError as exc:
+            raise PrinterError(f"BLE error: {exc}") from exc