rename mediator to EventChannel as it was named wrongly

src/EventChannel.h

@@ -0,0 +1,31 @@
+#ifndef __MEDIATOR__
+#define __MEDIATOR__
+
+#include <Arduino.h>
+#include <ArduinoJson.h>
+#include <list>
+#include <functional>
+#include <map>
+#include <vector>
+
+using namespace std;
+
+typedef std::function<void(String msg)> subscriptionHandler_t;
+
+class EventChannel {
+    public:
+        std::map<std::string, vector<subscriptionHandler_t>> subscriptions;
+        void subscribe(String topic, subscriptionHandler_t handler) {
+            subscriptions[topic.c_str()].reserve(1);
+            subscriptions[topic.c_str()].push_back(handler);
+        }
+        void publish(String topic, String msg) {
+            if (subscriptions.find(topic.c_str()) != subscriptions.end()){
+                for(subscriptionHandler_t h : subscriptions[topic.c_str()]){
+                    h(msg);
+                }
+            }
+        }
+};
+
+#endif