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+# Use case Link Failure
+
+## General
+
+The Link Failure use case test provides a python script that regularly polls DMaaP Message Router (MR) for "CUS Link Failure"
+messages.
+
+When such a message appears with the "eventSeverity" set to anything but "NORMAL", a configuration change message with the
+"administrative-state" set to "UNLOCKED" will be sent to the O-DU mapped to the O-RU that sent the alarm.
+
+When such a message appears with the "eventSeverity" set to "NORMAL" a printout will be made to signal that the
+alarm has been cleared, provided that the verbose option has been used when the test was started.
+
+## Prerequisits
+
+To run this script Python3 needs to be installed. To install the script's dependencies, run the following command from
+the `app` folder: `pip install -r requirements.txt`
+
+Also, the MR needs to be up and running with a topic created for the alarms and there must be an endpoint for the
+configuration change event that will accept these.
+
+The host names and the ports to the MR and SDNR services can be provided when the container is started if the default
+values are not correct. The topic can also be changed.
+
+The mapping from O-RU ID to O-DU ID is specified in the file `o-ru-to-o-du-map.txt`. This can be replaced by providing
+a different file when starting the application.
+
+For convenience, a message generator and a change event endpoint simulator are provided.
+
+## How to run from command line
+
+Go to the `app/` folder and run `python3 main.py`. The script will start and run until stopped. Use the `-h` option to
+see the options available for the script.
+
+## How to run in Docker
+
+Go to the `app/` folder and run `docker build -t oru-app .`.
+
+The container must be connected to the same network as the MR and SDNR are running in. Some of the parameters to the application
+can be provided with the `-e PARAM_NAME=PARAM_VALUE` notation. Start the container by using the command, with available params listed:
+ `docker run --network [NETWORK NAME] --name oru-app -e VERBOSE=on -e MR-HOST=[HOST NAME OF MR] -e MR-PORT=[PORT OF MR] -e SDNR-HOST=[HOST NAME OF SDNR] -e SDNR-PORT=[PORT OF SDNR] oru-app`.
+
+To build the image for the message generator, run the following command from the `simulators` folder:
+`docker build -f Dockerfile-message-generator -t message-generator .`
+
+The message generator's container must be connected to the same network as the other components are running in. Some of the
+parameters to the application can be provided with the `-e PARAM_NAME=PARAM_VALUE` notation. Start the container by
+using the command, with available params listed:
+ `docker run --network [NETWORK NAME] --name message-generator -e MR-HOST=[HOST NAME OF MR] -e MR-PORT=[PORT OF MR] message-generator`.
+
+To build the image for the SDNR simulator, run the following command from the `simulators` folder:
+`docker build -f Dockerfile-sdnr-sim -t sdnr-simulator .`
+
+The SDNR simulator's container must be connected to the same network as the the other components are running in. Some of the
+parameters to the application can be provided with the `-e PARAM_NAME=PARAM_VALUE` notation. Start the container by
+using the command, with available params listed:
+ `docker run --network [NETWORK NAME] --name sdnr-simulator -e MR-HOST=[HOST NAME OF MR] -e MR-PORT=[PORT OF MR] sdnr-simulator`.
+
+## Use docker-compose
+
+Go to the `docker-compose/` folder and run `bash start.sh`.
+
+This scripts will start up four components:
+dmaap-mr
+oru-app
+sdnr-simulator
+message-generator
+
+## License
+
+Copyright (C) 2021 Nordix Foundation.
+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.
+
+For more information about license please see the [LICENSE](LICENSE.txt) file for details.