diff -r da7b461f54b7 -r 0af7b6a96c53 tests/cli_tests/opcua_test.bash
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/cli_tests/opcua_test.bash	Sun Jul 17 18:17:43 2022 +0200
@@ -0,0 +1,84 @@
+#!/bin/bash
+
+rm -f ./SRVOK ./PLCOK
+
+# Run server
+$BEREMIZPYTHONPATH - > >(
+    echo "Start SRV loop"
+    while read line; do 
+        # Wait for server to print modified value
+        echo "SRV>> $line"
+        if [[ "$line" == 3.4 ]]; then
+            echo "PLC could write value"
+            touch ./SRVOK
+        fi
+    done
+    echo "End SRV loop"
+) << EOF &
+
+import sys
+import time
+
+from opcua import ua, Server
+
+server = Server()
+server.set_endpoint("opc.tcp://127.0.0.1:4840/freeopcua/server/")
+
+uri = "http://beremiz.github.io"
+idx = server.register_namespace(uri)
+
+objects = server.get_objects_node()
+
+testobj = objects.add_object(idx, "TestObject")
+testvarout = testobj.add_variable(idx, "TestOut", 1.2)
+testvar = testobj.add_variable(idx, "TestIn", 5.6)
+testvar.set_writable()
+
+server.start()
+
+try:
+    while True:
+        time.sleep(1)
+        print testvar.get_value()
+        sys.stdout.flush()
+finally:
+    server.stop()
+EOF
+SERVER_PID=$!
+
+# Start PLC with opcua test
+setsid $BEREMIZPYTHONPATH $BEREMIZPATH/Beremiz_cli.py -k \
+     --project-home $BEREMIZPATH/tests/projects/opcua_client build transfer run > >(
+echo "Start PLC loop"
+while read line; do 
+    # Wait for PLC runtime to output expected value on stdout
+    echo "PLC>> $line"
+    if [[ "$line" == 1.2 ]]; then
+        echo "PLC could read value"
+        touch ./PLCOK
+    fi
+done
+echo "End PLC loop"
+) &
+PLC_PID=$!
+
+echo all subprocess started, start polling results
+res=110  # default to ETIMEDOUT
+c=30
+while ((c--)); do
+    if [[ -a ./SRVOK && -a ./PLCOK ]]; then
+        echo got results.
+        res=0  # OK success
+        break
+    else
+        echo waiting.... $c
+        sleep 1
+    fi
+done
+
+# Kill PLC and subprocess
+echo will kill PLC:$PLC_PID and SERVER:$SERVER_PID
+pkill -s $PLC_PID 
+kill $SERVER_PID
+
+exit $res