Update MessageSender to implement designed message format

src/event_handlers/message_sender.py

@@ -1,3 +1,6 @@
+import json
+from datetime import datetime
+
 from server_connector import ServerUplinkConnector
 
 
@@ -8,7 +11,11 @@ class MessageSender:
             custom_anchor = custom_anchor.encode('utf-8')
         self.anchor = custom_anchor or b'message'
 
-    def send(self, message):
-        if isinstance(message, str):
-            message = message.encode('utf-8')
-        self.server_connector.send(self.anchor, message)
+    def send(self, originator, message):
+        response = {
+            'originator': originator,
+            'timestamp': datetime.now().isoformat(),
+            'message': message
+        }
+        encoded_response = json.dumps(response).encode('utf-8')
+        self.server_connector.send(self.anchor, encoded_response)