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+/*****************************************************************************
+#                                                                            *
+# Copyright 2019 AT&T Intellectual Property                                  *
+# Copyright 2019 Nokia                                                       *
+#                                                                            *
+# 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.                                             *
+#                                                                            *
+******************************************************************************/
+
+# INSTALLATION
+  * Tested environment: Ubuntu 16.04
+  * Install dependencies
+    $ sudo apt-get update
+    $ sudo apt-get install -y
+        build-essential
+        git
+        cmake
+        libsctp-dev
+        lksctp-tools
+        autoconf
+        automake
+        libtool
+        bison
+        flex
+        libboost-all-dev
+    $ sudo apt-get clean
+
+  ## Build
+    $ ./build_e2sim
+
+# SET ENVIRONMENT VARIABLE
+  Add this line to `~/.bashrc`
+  $  export E2SIM_DIR=<your e2sim directory>
+
+# RUN E2SIM
+  $  cd $E2SIM_DIR/build/
+  $ ./e2agent [SERVER IP] [PORT]
+
+  By default, SERVER IP = 127.0.0.1, PORT = 36422 (X2AP Port)
+
+# DOCKER
+  Note: The commands in this section must be run from $E2SIM_DIR
+
+  * Build docker image
+  $ ./build_docker
+
+  ## Run docker container
+  $ sudo docker run --rm --net host -it e2agent sh -c "./build/e2agent [SERVER IP] [PORT]"
+
+# SUPPORTED MESSAGE FLOWS (Last updated May 24, 2019)
+
+- X2 SETUP REQUEST          (RIC -> RAN)
+- X2 SETUP RESPONSE         (RAN -> RIC)
+
+- ENDC X2 SETUP REQUEST     (RIC -> RAN)
+- ENDC X2 SETUP RESPONSE    (RAN -> RIC)
+
+- RIC SUBSCRIPTION REQUEST  (RIC -> RAN)
+- RIC SUBSCRIPTION RESPONSE (RAN -> RIC)
+- RIC SUBSCRIPTION FAILURE  (RAN -> RIC)
+
+
+# Change logs:
+  03/12/2019: currently supports sending and receiving X2 SETUP messages
+  05/21/2019: add support for ENDC X2 SETUP   
+              no longer use asn1c
+              all X2AP and E2AP messages are encapsulated into E2AP-PDU
+  05/24/2019: add support for RIC SUBSCRIPTION REQUEST, RESPONSE, and FAILURE