add mqtt.conf example

etc/mqtt.conf

@@ -0,0 +1,40 @@
+logging = {
+    level = "debug"
+}
+
+nodes = {
+    mqtt_node = {
+        type = "mqtt",
+        format = "json",
+        username = "villas",
+        password = "s3c0sim4!",
+        host = "137.226.248.91",
+        in = {
+            subscribe = "villas-dpsim1"
+        }
+        out = {
+            publish = "dpsim1-villas"
+        }
+    },
+    signal_node = {
+        type = "signal",
+        signal = "mixed",
+        values = 5
+    }
+}
+paths = (
+    {
+        in = [
+            "signal_node"
+        ],
+        out = [
+            "mqtt_node"
+        ],
+        reverse = false,
+        hooks = (
+            {
+                type = "print"
+            }
+        )
+    }
+)