feat(python): give the emulator a little more time to respond to ping

python/.changelog.d/1565.added

@@ -0,0 +1 @@
+Wait up to 1 second for emulator responses.

python/src/trezorlib/transport/udp.py

@@ -24,6 +24,7 @@ from . import TransportException
 from .protocol import ProtocolBasedTransport, ProtocolV1
 
 SOCKET_TIMEOUT = 10
+TRY_PATH_TIMEOUT = 1
 
 LOG = logging.getLogger(__name__)
 
@@ -59,15 +60,12 @@ class UdpTransport(ProtocolBasedTransport):
     def _try_path(cls, path: str) -> "UdpTransport":
         d = cls(path)
         try:
-            d.open()
-            if d._ping():
+            d.wait_until_ready(timeout=TRY_PATH_TIMEOUT)
             return d
-            else:
+        except Exception as e:
             raise TransportException(
                 "No Trezor device found at address {}".format(d.get_path())
-                )
-        finally:
-            d.close()
+            ) from e
 
     @classmethod
     def enumerate(cls) -> Iterable["UdpTransport"]: