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diff --git a/src/E2SM/e2sm.hpp b/src/E2SM/e2sm.hpp
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+/*
+==================================================================================
+
+        Copyright (c) 2018-2019 AT&T Intellectual Property.
+
+   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.
+==================================================================================
+*/
+
+/* Classes to handle E2 service model based on e2sm-gNB-X2-release-1-v040.asn */
+
+#ifndef E2SM_
+#define E2SM_
+
+
+#include <sstream>
+#include <e2sm_helpers.hpp>
+#include <mdclog/mdclog.h>
+#include <E2SM-gNB-X2-indicationHeader.h>
+#include <E2SM-gNB-X2-indicationMessage.h>
+#include <E2SM-gNB-X2-controlHeader.h>
+#include <E2SM-gNB-X2-controlMessage.h>
+#include <E2SM-gNB-X2-eventTriggerDefinition.h>
+
+#include <GlobalGNB-ID.h>
+#include <TypeOfMessage.h>
+#include <InterfaceProtocolIE-Item.h>
+
+#include<InterfaceProtocolIE-ID.h>
+#include<InterfaceProtocolIE-Value.h>
+#include<InterfaceProtocolIE-Test.h>
+
+#define INITIAL_LIST_SIZE 4
+
+  
+
+  
+/* builder class for E2SM event trigger definition */
+
+class e2sm_event_trigger {
+public:
+  e2sm_event_trigger(void);
+  ~e2sm_event_trigger(void);
+    
+  bool set_fields(E2SM_gNB_X2_eventTriggerDefinition_t *, e2sm_event_trigger_helper &);
+  bool get_fields(E2SM_gNB_X2_eventTriggerDefinition_t *, e2sm_event_trigger_helper &);
+  bool encode_event_trigger(unsigned char *, size_t *, e2sm_event_trigger_helper &);
+
+  std::string  get_error (void) const {return error_string ;};
+  
+private:
+
+  E2SM_gNB_X2_eventTriggerDefinition_t * event_trigger; // used for encoding
+  GlobalGNB_ID_t gNodeB_ID;
+  struct InterfaceProtocolIE_Item * ie_list;
+  unsigned int ie_list_size;
+    
+  //std::vector<struct InterfaceProtocolIE_Item> ie_list;
+  E2SM_gNB_X2_eventTriggerDefinition::E2SM_gNB_X2_eventTriggerDefinition__interfaceProtocolIE_List *condition_list;
+    
+  char errbuf[128];
+  size_t errbuf_len;
+  std::string error_string;
+};
+  
+    
+/* builder class for E2SM indication  using ASN1c */
+  
+class e2sm_indication {
+public:
+    
+  e2sm_indication(void);
+  ~e2sm_indication(void);
+    
+  E2SM_gNB_X2_indicationHeader_t * get_header(void);
+  E2SM_gNB_X2_indicationMessage_t * get_message(void);
+
+  bool set_header_fields(E2SM_gNB_X2_indicationHeader_t *, e2sm_header_helper &);
+  bool get_header_fields(E2SM_gNB_X2_indicationHeader_t *, e2sm_header_helper &);
+    
+  bool set_message_fields(E2SM_gNB_X2_indicationMessage_t *, e2sm_message_helper &);
+  bool get_message_fields(E2SM_gNB_X2_indicationMessage_t *, e2sm_message_helper &);
+
+  bool encode_indication_header(unsigned char * , size_t * , e2sm_header_helper &); 
+  bool encode_indication_message(unsigned char *, size_t *, e2sm_message_helper &);
+  std::string  get_error (void) const {return error_string ; };
+    
+private:
+  
+  E2SM_gNB_X2_indicationHeader_t *header; // used for encoding
+  E2SM_gNB_X2_indicationMessage_t *message; // used for encoding
+    
+  char errbuf[128];
+  size_t errbuf_len;
+  GlobalGNB_ID_t gNodeB_ID;
+  std::string error_string;
+
+  
+};
+
+/* builder class for E2SM control  using ASN1c */
+  
+class e2sm_control {
+public:
+    
+  e2sm_control(void);
+  ~e2sm_control(void);
+    
+  E2SM_gNB_X2_controlHeader_t * get_header(void);
+  E2SM_gNB_X2_controlMessage_t * get_message(void);
+
+  bool set_header_fields(E2SM_gNB_X2_controlHeader_t *, e2sm_header_helper &);
+  bool get_header_fields(E2SM_gNB_X2_controlHeader_t *, e2sm_header_helper &);
+    
+  bool set_message_fields(E2SM_gNB_X2_controlMessage_t *, e2sm_message_helper &);
+  bool get_message_fields(E2SM_gNB_X2_controlMessage_t *, e2sm_message_helper &);
+
+  bool encode_control_header(unsigned char * , size_t * , e2sm_header_helper &); 
+  bool encode_control_message(unsigned char *, size_t *, e2sm_message_helper &);
+  std::string  get_error (void) const {return error_string ; };
+    
+private:
+  
+  E2SM_gNB_X2_controlHeader_t *header; // used for encoding
+  E2SM_gNB_X2_controlMessage_t *message; // used for encoding
+    
+  char errbuf[128];
+  size_t errbuf_len;
+  GlobalGNB_ID_t gNodeB_ID;
+  std::string error_string;
+
+  
+};
+
+#endif