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Advantech AE Technical Share Document Date  2016 / 3 / 10  SR#  1‐2401078053 

Category  ■ FAQ    □ SOP  Related OS  Microsoft Windows7 

Abstract  WebAccess Cloud Introduction 

Keyword  WebAccess, Rest API, MQTT, Node‐Red 

Related Product  N/A 

Problem Description:   

This document describes the new WebAccess SCADA structure. WebAccess SCADA has transformed from 

private cloud to public cloud, and it can also integrate 3rd party data. In this document, user will also lean 

the basic concept of Rest API, MQTT and Node‐Red. 

Introduction: 

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AgendaAgenda

WebAccess REST API

MQTT Communication

WebAccess Node-RED

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REST API Function ClassificationREST API Function Classification

Login

Project

Node

Port

Device

Tag

Block

2

Tag Value

Station Status

Data Log

Alarm

Action Log

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Developer ManualDeveloper Manual

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HTTP Request Header for REST APIHTTP Request Header for REST API

User-Agent: Fiddler

Authorization: Basic YWRtaW46d2E=

Content-Type: application/json

Host: wavm.cloudapp.net

4

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HTTP Request Body for GetTagValueHTTP Request Body for GetTagValue

{

"Tags": {

[

{ "Name": "A01" },

{ "Name": "A02" }

]

}

}

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Fiddler – A Web Debugging ToolFiddler – A Web Debugging Tool

6

http://www.telerik.com/fiddler

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Programming in HTML/JavascriptProgramming in HTML/Javascript

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WebAccess CloudWebAccess Cloud

WebAccess/HMI WebAccess/SCADA

WebAccess Cloud

WISE 4000

3rd Party APIs

3rd Party Smart Devices

3rd Party Services

WebAccess Node-RED WebAccessDashboard

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MQTT is a publish/subscribe messaging protocol designed for lightweight M2M communications. It was originally developed by IBM and is now an popular standard for IoT.

Why MQTT?Why MQTT?

What is MQTT?What is MQTT?

MQTT Broker

Publisher 1

Publisher 2

Publisher 3

Subscriber 1

Subscriber 2

Subscriber 3

Topic 1

Topic 2

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MQTT CommunicationMQTT CommunicationWindows VM

Super SCADA

Cloud Project

WebAccessSCADA

WebAccessHMI

WISE 4000

MQTT Broker

WebSocket MQTT WebSocket MQTT WebSocket MQTT

Data

MQTT Driver (Data)

Config

MQTT Agent (Config)

Command

MQTT over WebSocket AdvantagesMQTT over WebSocket Advantages

Lightweight- portable for embedded device

Efficient- publish/subscribe(event trigger), not polling based

Firewall Friendly- based on HTTP/HTTPS

Security- SSL/TLS support

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MQTT Connection ParameterMQTT Connection Parameter

Broker IP or Domain

Cloud Project Name

Cloud SCADA Name

Quality of service:QoS 0:

At most once

QoS 1:At least once

QoS 2(not support):Exactly once

Username / Password

SSL/TLS

Example: SCADA MQTT Connection UIExample: SCADA MQTT Connection UI

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HiveMQ: 3rd Party WebSocket MQTT ToolHiveMQ: 3rd Party WebSocket MQTT Tool

15

http://www.hivemq.com/demos/websocket-client/

Configuration on CloudConfiguration on Cloud

16

Plug and Play is still in development !!

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Node-RED Enter PointNode-RED Enter Point

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Node-RED EditorNode-RED Editor

18

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Node-RED Editor : Built-in NodesNode-RED Editor : Built-in Nodes

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Nodes ClassificationNodes Classification

I/O- get/set value…

Dashboard- generate dashboard & widget

Conversion- data type transformation

Logic- and, or, not…

Math- add, subtract, multiplication…

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Coding JavaScript in Node-REDCoding JavaScript in Node-RED

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Debug MessageDebug Message

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Multiple Data Source, Auto-Generate DashboardMultiple Data Source, Auto-Generate Dashboard

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3rd Party Data/APIs

Data source can be from 3rd or WebAccess