iotagent-manager

Index

• Overview
• Configuration
• Installation
• Usage
• Subscription API
• Development Documentation

Overview

Description

The IoT Agent Manager works as a proxy for scenarios where multiple IoT Agents offer different southbound protocols. The IoTA Manager appears as a single administration endpoint for provisioning tasks, redirecting provisioning requests to the appropriate IoTAgent based on the declared protocol.

The IoTAgent Manager also offers a cache of all the provided device Configurations, to fasten the retrieval of certain information from the Agents.

Additional information about operating the component can be found in the Operations: logs and alarms document.

Configuration

The IoT Agent Manager main configuration point is the config.js file at the root of the project. The following section explains each configuration parameter in detail.

Configuration parameters

• server.port: port where the server will be listening for connections.
• server.host: address the server will bind to.
• mongodb.host: host where the Mongo DB instance is listening.
• mongodb.port: port where the Mongo DB instance is listening.
• mongodb.db: name of the Mongo DB database to use.
• bodyParserLimit: set bodyParser limit. Default is 5Mb.
• logLevel: set the log level for the internal logger. Its allowed values are: FATAL, ERROR, WARNING, INFO and DEBUG.

Environment variables

Some of the configuration parameters can also be modified using environment variables when starting the process. The following table shows the correspondence between allowed environment variables and configuration parameters.

Environment variable	Configuration attribute
IOTA_SERVER_PORT	server.port
IOTA_SERVER_HOST	server.host
IOTA_MONGO_HOST	mongodb.host
IOTA_MONGO_PORT	mongodb.port
IOTA_MONGO_REPLICASET	mongodb.replicaSet
IOTA_MONGO_DB	mongodb.db
IOTA_BODYPARSER_LIMIT	bodyParserLimit
IOTA_LOG_LEVEL	logLevel

Installation

There are two ways of installing the IoT Agent Manager: using Git or RPMs.

Using GIT

In order to install the IoT Agent Manager, just clone the project and install the dependencies:

git clone https://github.com/telefonicaid/iotagent-manager.git
npm install

In order to start the IoT Agent Manager, from the root folder of the project, type:

bin/iota-manager

Using RPM

The project contains a script for generating an RPM that can be installed in Red Hat 6.5 compatible Linux distributions. The RPM depends on Node.js 0.10 version, so EPEL repositories are advisable.

In order to create the RPM, execute the following scritp, inside the /rpm folder:

create-rpm.sh -v <versionNumber> -r <releaseNumber>

Once the RPM is generated, it can be installed using the followogin command:

yum localinstall --nogpg <nameOfTheRPM>.rpm

The IoTA Manager will then be installed as a linux service, and can ve started with the service command as usual:

service iotamanager start

Docker installation

The Docker automatically starts listening in the API ports, so there is no need to execute any process in order to have the application running. The Docker image will automatically start.

In order to run the docker image, first you must have a MongoDB instance running. You can achieve this by executing the following command:

   docker run -d -p 27017:27017 --hostname mongo --name mongo mongo:6.0.12

Build your own Docker image

There is also the possibility to build your own local Docker image of the IOTagent-manager component.

To do it, follow the next steps once you have installed Docker in your machine:

1. Navigate to the path where the component repository was cloned.
2. Launch a Docker build
   • Using the default NodeJS version of the operating system used defined in FROM keyword of Dockerfile:

   sudo docker build -f Dockerfile .

   • Using an alternative NodeJS version:

   sudo docker build --build-arg NODEJS_VERSION=0.10.46 -f Dockerfile .

Once the MongoDB instance is running, you can execute the IoT Manager with the following command:

docker run -d  --link mongodb:mongo -e "IOTA_LOG_LEVEL=DEBUG" -e "IOTA_MONGO_HOST=mongo" -p 8082:8082 telefonicaiot/iotamanager

Using PM2

The IoT Agent Manager within the Docker image can be run encapsulated within the pm2 Process Manager by adding the PM2_ENABLED environment variable.

docker run --name iotagent-manager -e PM2_ENABLED=true -d fiware/iotagent-manager

Use of pm2 is disabled by default. It is unnecessary and counterproductive to add an additional process manager if your dockerized environment is already configured to restart Node.js processes whenever they exit (e.g. when using Kubernetes)

Usage

In order to execute the IoT Agent Manager just execute the following command from the root folder:

bin/iota-manager.js

This will start the IoT Agent Manager in the foreground. Use standard linux commands to start it in background.

When started with no arguments, the IoT Agent Manager will expect to find a config.js file with the configuration in the root folder. An argument can be passed with the path to a new configuration file (relative to the application folder) to be used instead of the default one.

Subscription API

New Subscription (POST /iot/protocols)

Whenever a new IoT Agent wants to register itself into the IoTAgent Manager, it must send a subscription request to the following path: ``, indicating the following information:

• protocol: Name of the protocol served by the IoTAgent.
• description: Textual description for its display in portals.
• iotagent: URL address where requests for this IoT Agent will be redirected.
• resource: Unique string used to identify different IoT Agents for the same protocol.
• services: List of device Configurations available in the IoT Agent. The IoTA Manager saves a cache for all the configurations, aimed to be used to fasten the operations agains the IoTA databases.

The following example shows a registration of an IoT Agent that already have some configuration groups registered in the IoT Agent:

{
    "protocol": "GENERIC_PROTOCOL",
    "description": "A generic protocol",
    "iotagent": "http://smartGondor.com/iot",
    "resource": "/iot/d",
    "services": [
        {
            "apikey": "801230BJKL23Y9090DSFL123HJK09H324HV8732",
            "token": "8970A9078A803H3BL98PINEQRW8342HBAMS",
            "entity_type": "SensorMachine",
            "resource": "/deviceTest",
            "service": "theService",
            "service_path": "theSubService",
            "attributes": [
                {
                    "name": "status",
                    "type": "Boolean"
                }
            ]
        }
    ]
}

This operation can be used also to update the protocol subscriptions. If a protocol creation request arrives to the IoTAgent Manager with the same protocol and resource of an already existing agent, it will override the record with the new information.

List subscriptions (GET /iot/protocols)

Retrieve the list of all the available protocols, with their available endpoints. The following example shows a sample response from the server:

{
    "count": 1,
    "protocols": [
        {
            "protocol": "PDI-IoTA-UltraLight",
            "description": "UL2",
            "endpoints": [{ "endpoint": "http://127.0.0.1:8080/iot", "identifier": "idcl1:8080", "resource": "/iot/d" }]
        }
    ]
}

The list accepts to query parameters:

• limit: limits the number of entries to return from the query.
• offset: skips the given number of entries from the database before returning the list.

Development documentation

Project build

The project is managed using npm.

For a list of available task, type

npm run

The following sections show the available options in detail.

Start

Runs a local version of the IoT Manager

npm start

Testing

Mocha Test Runner + Should.js Assertion Library.

The test environment is preconfigured to run BDD testing style.

Module mocking during testing can be done with proxyquire

To run tests, type

docker run -d -p 27017:27017 mongo:4.4

npm test

Coding guidelines

jshint

Uses provided .jshintrc flag file. To check source code style, type

npm run lint

Continuous testing

Support for continuous testing by modifying a src file or a test. For continuous testing, type

npm run test:watch

If you want to continuously check also source code style, use instead:

npm run watch

Code Coverage

Istanbul

Analizes the code coverage of your tests.

To generate an HTML coverage report under site/coverage/ and to print out a summary, type

# Use git-bash on Windows
npm run test:coverage

Clean

Removes node_modules and coverage folders, and package-lock.json file so that a fresh copy of the project is restored.

# Use git-bash on Windows
npm run clean