From 8bfe969a95ca27fff1e2729942b8fd318668d44f Mon Sep 17 00:00:00 2001
From: Markus Zolliker <markus.zolliker@psi.ch>
Date: Thu, 8 Sep 2022 14:55:36 +0200
Subject: [PATCH] HasIO: attached io must not be mandatory

as an uri might be given instead.
---
 secop/io.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/secop/io.py b/secop/io.py
index 07932ef..0ff9359 100644
--- a/secop/io.py
+++ b/secop/io.py
@@ -47,7 +47,7 @@ class SilentError(CommunicationFailedError):
 
 class HasIO(Module):
     """Mixin for modules using a communicator"""
-    io = Attached()
+    io = Attached(mandatory=False)
     uri = Property('uri for automatic creation of the attached communication module',
                    StringType(), default='')