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diff --git a/include/afb/afb-event-x2-itf.h b/include/afb/afb-event-x2-itf.h
new file mode 100644
index 00000000..ecc42c79
--- /dev/null
+++ b/include/afb/afb-event-x2-itf.h
@@ -0,0 +1,57 @@
+/*
+ * Copyright (C) 2016, 2017, 2018 "IoT.bzh"
+ * Author: José Bollo <jose.bollo@iot.bzh>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+struct afb_event_x2;
+struct afb_event_x2_itf;
+
+/**
+ * Interface for handling event_x2.
+ *
+ * It records the functions to be called for the event_x2.
+ *
+ * Don't use this structure directly.
+ */
+struct afb_event_x2_itf
+{
+	/* CAUTION: respect the order, add at the end */
+
+	/** broadcast the event */
+	int (*broadcast)(struct afb_event_x2 *event, struct json_object *obj);
+
+	/** push the event to its subscribers */
+	int (*push)(struct afb_event_x2 *event, struct json_object *obj);
+
+	/** unreference the event */
+	void (*unref)(struct afb_event_x2 *event); /* aka drop */
+
+	/** get the event name */
+	const char *(*name)(struct afb_event_x2 *event);
+
+	/** rereference the event */
+	struct afb_event_x2 *(*addref)(struct afb_event_x2 *event);
+};
+
+/**
+ * Describes the event_x2
+ */
+struct afb_event_x2
+{
+	const struct afb_event_x2_itf *itf;	/**< the interface functions to use */
+};
+