From 64cb297a067a2511a2f1681226bb4461b1a6d00c Mon Sep 17 00:00:00 2001
From: Markus Zolliker <markus.zolliker@psi.ch>
Date: Thu, 22 Sep 2022 07:55:31 +0200
Subject: [PATCH] HasIO: automatic creation of io from uri fails

attached io in HasIO must not be mandatory - either uri or io
has to be given

Change-Id: Id39e40f98020d4051c1ad8105f6af6018aafaea8
Reviewed-on: https://forge.frm2.tum.de/review/c/sine2020/secop/playground/+/29349
Tested-by: Jenkins Automated Tests <pedersen+jenkins@frm2.tum.de>
Reviewed-by: Enrico Faulhaber <enrico.faulhaber@frm2.tum.de>
Reviewed-by: Markus Zolliker <markus.zolliker@psi.ch>
---
 secop/io.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/secop/io.py b/secop/io.py
index 26c572a..1552049 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)  # either io or uri must be given
     uri = Property('uri for automatic creation of the attached communication module',
                    StringType(), default='')