Created by Benedict Wetzel

• 1. Introduction
• 2. Requirements
• 3. Prerequisits
• 4. Dependecies
• 5. Technical Overview

1. Introduction

This module puts all its sub-modules together and creates the test application itself. It also contains the Dockerfile, that can be used to build a docker-image.

2. Requirements

The following requirements are covered by this module:

• LF30
• NF20
• LF40

3. Prerequisites

In order to use this module the following prerequisites should be met:

• The developer should have a working computer that can access the internet
• The developer should use a Linux-based OS
• The developer should have Docker version 20.10.2 or higher installed
• The developer should have Node.js version 12.14.1 or higher installed
• The developer should have at least some basic experience with Node.js

4. Dependencies

This module depends on the following sub-modules:

• MOD21: Web-Inteface
• MOD22: Announce Service via DNS-SD
• MOD23: Register itself at the OI4-Service-Registry
• MOD24: DNS-SD-Listener

5. Technical overview

The file main.js is the entry point of the main docker application. It imports the sub-modules MOD21, MOD22, MOD23 and MOD24 using the require operator.

This module also controls the configuration of the application. To do so, it reads environment variables and creates a configuration object, that is then passed to the sub-modules. It also registers a callback with MOD24 to add found DNS-SD entries to the Web Interface (MOD21). The sub-modules are started with their respective start-functions.

The Dockerfile builds a docker-image, that includes this module and its sub-modules. For every sub-module 'npm install' is run to install their dependencies.