link: make websockets import lazy

bumble/link.py

@@ -19,8 +19,6 @@ import logging
 import asyncio
 from functools import partial
 
-import websockets
-
 from bumble.colors import color
 from bumble.hci import (
     Address,
@@ -220,6 +218,8 @@ class RemoteLink:
                 )
 
     async def run_connection(self):
+        import websockets  # lazy import
+
         # Connect to the relay
         logger.debug(f'connecting to {self.uri}')
         # pylint: disable-next=no-member

bumble/transport/__init__.py

@@ -18,7 +18,6 @@
 import logging
 
 from .common import Transport, AsyncPipeSink
-from ..link import RemoteLink
 from ..controller import Controller
 
 # -----------------------------------------------------------------------------
@@ -110,6 +109,8 @@ async def open_transport(name: str) -> Transport:
 # -----------------------------------------------------------------------------
 async def open_transport_or_link(name):
     if name.startswith('link-relay:'):
+        from ..link import RemoteLink  # lazy import
+
         link = RemoteLink(name[11:])
         await link.wait_until_connected()
         controller = Controller('remote', link=link)