Add add-on changelog and improve classic RFCOMM fallback (0.1.9)

fichero/printer.py

@@ -384,10 +384,25 @@ async def connect(
     if classic:
         if not address:
             raise PrinterError("--address is required for Classic Bluetooth (no scanning)")
-        async with RFCOMMClient(address, channel) as client:
-            pc = PrinterClient(client)
-            await pc.start()
-            yield pc
+        # D11s variants are commonly exposed on channel 1 or 3.
+        candidates = [channel, 1, 2, 3]
+        channels = [ch for i, ch in enumerate(candidates) if ch > 0 and ch not in candidates[:i]]
+        last_exc: Exception | None = None
+        for ch in channels:
+            try:
+                async with RFCOMMClient(address, ch) as client:
+                    pc = PrinterClient(client)
+                    await pc.start()
+                    yield pc
+                    return
+            except (PrinterError, PrinterTimeout) as exc:
+                last_exc = exc
+        if last_exc is not None:
+            raise PrinterError(
+                f"Classic Bluetooth connection failed for '{address}'. "
+                f"Tried channels: {channels}. Last error: {last_exc}"
+            ) from last_exc
+        raise PrinterError(f"Classic Bluetooth connection failed for '{address}'.")
     else:
         addr = address or await find_printer()
         try: