sending is a requirement of inheritors

protocol/osc/client.h

@@ -23,6 +23,9 @@
 */
 #pragma once
 
+#include <memory>
+#include "message.h"
+
 namespace OSC {
 
 /**
@@ -33,6 +36,11 @@ class Client
 public:
     explicit Client();
     virtual ~Client();
+
+    /**
+     * @brief send
+     */
+    virtual void send(std::shared_ptr<Message>) = 0;
 };
 
 } // namespace OSC