Fix bug where security event notification was sent while bootnotification was still pending. #984

Bug was caused by security event messages stored in the database. Setting a flag when  retrieving it from the database to wait sending the message until the bootnotification is accepted, fixes it. 

Signed-off-by: Maaike Zijderveld, iolar <git.mail@iolar.nl>

Author: maaikez

include/ocpp/common/message_queue.hpp

@@ -601,7 +601,7 @@ template <typename M> class MessageQueue {
                         }
                     } else {
                         std::shared_ptr<ControlMessage<M>> message =
-                            std::make_shared<ControlMessage<M>>(persisted_message.json_message);
+                            std::make_shared<ControlMessage<M>>(persisted_message.json_message, true);
                         message->messageType = string_to_messagetype(persisted_message.message_type);
                         message->timestamp = persisted_message.timestamp;
                         message->message_attempts = persisted_message.message_attempts;