Node-RED overview and prerequisite knowledge

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A Developer's guide to Node-RED

25 classificações

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IBM

A Developer's guide to Node-RED

25 classificações

>>> By enrolling in this course you agree to the End User License Agreement as set out in the FAQ. Once enrolled you can access the license in the Resources area <<< Rapid application development using agile methodologies and processes are increasingly being used when developing applications. There is pressure on development teams to reduce the time needed to convert an idea into a working solution, be it as part of an innovation workshop or hackathon, a prototype for a new solution idea or main stream development. Developers are looking for new ways to allow them to be more production and innovations, such as Node-RED from the JS Foundation is a technology that allows a developer to rapidly create applications, taking a fraction of the time need coding write code. Node-RED is built on Node.js, so will run anywhere capable of hosting node.js applications, such as small single board computers like the Raspberry Pi or Beaglebone, on your laptop or workstation or in cloud environments, such as the IBM Cloud. Node red allows developers to compose flows using a pallet of nodes, where each node provides prebuilt functionality, that can be connected to other nodes to rapidly construct an application. This course assumes some basic knowledge of Node-RED, so if you have not used Node-RED then you may want to take a look at the Coursera course - A Developer’s Guide to the Internet of Things (https://www.coursera.org/learn/developer-iot/), which provides a beginner look at Node-RED. What you will learn: The course will improve your use of Node-RED. It will introduce some more advanced features available in key nodes, show you how to visualise data using dashboard nodes. It shows you how to create web APIs using Node-RED and how to consume web services and how to make use of different storage technologies within a Node-RED flow. The last section of the course shows how you can extend Node-RED by creating your own nodes. What technology is required to complete the course? The course requires you to have an IBM Cloud account, as some of the assignment work does make use of designated cloud services. You can create a free account on the IBM Cloud and in week 2 of the course we make a promotional code available, which unlocks some additional resources on the IBM Cloud, so you can complete the course without having to provide credit card information or pay for cloud services. If you choose to take this course and earn the Coursera course certificate, you will also earn an IBM digital badge. To find out more about IBM digital badges follow the link https://ibm.biz/badging.

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Week 1 - Introduction and Review of Node-RED

Welcome to the course. This learning module introduces you to course and the instructors. The module outlines the content covered on the course and gives an introduction to the Internet of Things. It also discusses the requirements needed to complete the course including the hardware, software and details of prerequisite skills required to complete the programming assignments. The module then discusses using Node-RED to create cloud applications and the different options available to customise the Node-RED runtime

Node-RED overview and prerequisite knowledge7:11

Conheça os instrutores

Brian Innes
Developer Advocate
IBM Digital Business Group
Nick O'Leary
Developer Advocate
IBM Digital Business Group
Maeve O'Reilly
IT Specialist
IBM Watson Internet of Things
John Walicki
Watson IoT Developer Advocate
Watson Internet of Things

This course assumes some prior knowledge of Node-RED.

And in this lecture, I'll give a quick summary of

the features the course expects you to know.

If you're not familiar with any of the features mentioned in the lecture,

your advised to take time to familiarize yourself with them before continuing the course,

as some of the assignment work may require you to make use of them.

The course also uses the IBM Cloud.

A free account is available on the cloud and in week two of the course,

we provide access to promotional codes that provide additional resource on the IBM Cloud,

which enable you to complete the coursework and

all the assignment work without needing to pay for cloud services.

You will need an IBM Cloud account to be able

to complete all of the assignment work on the course.

And the course assumes you have basic working knowledge

of the IBM Cloud and using Node-RED on the IBM cloud.

The Coursera course, a developer's guide to the Internet of

Things teaches all the prerequisite knowledge on Node-RED and the IBM cloud.

Throughout this class, the lectures will use

Node-RED running on the IBM cloud or a Raspberry Pi.

There are a few sections that use additional services available in the cloud environment,

but most of the content can be run on a Raspberry Pi

on your laptop or workstation or from the IBM Cloud.

When running on the IBM Cloud,

you should deploy the IoT Boilerplate which provides a Node-Red runtime,

a noSQL database in addition to the Watson Internet of Things platform.

After deploying the Boilerplate,

you must enable continuous delivery to be able

to edit the configuration files for the Node-RED runtime.

This course assumes you are able to navigate to the Continuous Delivery Toolchain,

open the online editor and then edit required files.

Save the files and push them into the Git repository

to cause an automatic redeployment of the Node-RED application.

After you have Node-RED installed and running on your preferred environment,

you can access the editor using the browser.

Port 1880 is a standard port to access Node-RED,

but you can alter the port as needed in the server configuration.

On the IBM Cloud, the default port for HTTP or

HTTPS is used so no port needs to be specified.

You create flows by adding nodes from the pallet

of available nodes and then connecting them up.

You can find additional nodes available for Node-RED

using the flows page of the Node-RED website.

The link to the site is in the resources section for the course.

You can add additional nodes to the pallet in a number of ways.

From version node 0.15 of Node-RED,

you can add nodes using the web UI but only if

additional system packages are not required before the node can work.

All required dependencies must be satisfied,

and the node documentation, available using the links on

the package page of the Node-RED site, should

provide details of any prerequisite software required.

The other way to install nodes is to use npm on the command line.

You can install globally using npm install -g,

but it's more usual to install to the .node-red directory,

which is in your home directory.

Just run npm install and then provide the package name.

Again, look at the node documentation to see if there are

any additional system packages required before installing the node.

On the IBM Cloud,

you should add the node packages to the package.json

file and then redeploy the application to add additional nodes,

as this ensures the nodes will be available on all instances of the application.

Using npm on the command line or using

the web UI will work for single instance deployments,

but adding to the package.json

file will ensure the additional nodes are always available.

The material in this course assumes you are familiar with the following nodes.

The debug node allows you to see messages flowing out of a node.

You should know how to inspect the default payload property,

navigate through arrays and objects in the debug panel,

and know how to inspect a specific property or

access all properties of the object leaving a node.

The inject node allows you to manually initiate

a flow or be configured to trigger a flow at startup or at regular intervals.

You should know how to configure the node and how to set

the payload of the outgoing message to the correct type and value.

The function node allows you to create

bespoke functionality not available in other nodes.

You should be able to use the function node to run JavaScript code.

You should understand how to use the global and local context objects,

how to use the various logging functions.

You should also understand how to make

additional JavaScript packages available to your code within a function node.

And this uses the function global context property in the settings file.

And then you have to add the package to the package.json file.

The HTTP input and response node allow you to create

a web endpoint that initiates a flow to generate the response.

You should know how the basic operation of these nodes work,

but in week three, we look at more advanced uses of these nodes.

The HTTP request node allows you to call a web endpoint.

You should know how to use this node to make a web call.

But again, in week three,

we cover the use of this node.

The template node provides the ability to provide

templated content containing tokens that should be replaced with live data.

You should know how to create a mustache-style template

with tokens that will be replaced when the node receives an incoming message.

You should also be familiar with how to create optional sections within the template,

which depend on the presence or absence of a property.

The switch node provides capabilities

to direct messages down different branches of a flow.

You should know the basic functionality of the switch node,

but in week two, we're going to look at some of the more complex options available.

The change node allows you to modify the content of a flow or context object.

You should understand the basic operations, but again,

in week two, we're going to look at some of the more advanced options available.

If any of the topics talked about in this video aren't familiar to you,

I'd recommend you do a little additional learning,

either using the developer's guide to IoT course or

your own research to ensure you understand

all the topics covered before progressing on the course.

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