Add skeleton for testing.

tests/test.py

+"""
+  OPC-UA test agent used for testing of PLC program here: https://lab.nexedi.com/nexedi/osie/tree/master/Beremiz/beremiz_test_opc_ua
+  XXX:
+  - add asserts
+"""
 from opcua import Client
+import time
 
 client = Client("opc.tcp://k2-osie:4840/")
 
@@ -8,9 +14,13 @@ try:
   # Client has a few methods to get proxy to UA nodes that should always be in address space such as Root or Objects
   root = client.get_root_node()
   children_list = root.get_children()
-
+  for i in range (0,10):
     var = client.get_node("ns=1;s=i2c0.relay0")
     i2c0_relay0 = var.get_value()
+    # XXX: do asserts here
     print  i2c0_relay0
+    print "sleep"
+    time.sleep(5)
+  
 finally:
   client.disconnect()