IoTGateway/Node-Red

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Advantech implements some Node-RED nodes for better development experience.

Overview

In this section, we talk about the basic operations for Node-RED. Here, we take WSN node as an example.

  1. Open your browser, enter Advantech IoT Gateway's IP address with Node-RED port 1880 to open Node-RED web page.
  2. On the left of the page, scroll down to find wsn-related nodes in Advantech section as depicted below.

Open nodered.jpg

Example: Get SensorHub List

This example shows how to build a control flow to get a list of sensorhub MAC address on selected network interface.

1. Build a flow using inject as input node to wsn-gw node, and debug as output node.

2. Double click on wsn-gw node to open Edit wsn-gw node window and configure the node as below

Item Value
Operation Get
Net Type WSN
Net ID WSN0(your Interface MAC)
Category Info
Attribute SenHubList

3. Connect nodes together and click on Deploy

Wsn-gw get senhublist.png


4. Click on the input node and you will see the result in debug window

Wsn-gw get senhublist result.png


5. The output in the debug window is a JSON format string describing the result 

{ 
    "StatusCode": 200, 
    "Result": { 
        "n": "SenHubList", 
        "sv": "00170d0000603a0e,00170d0000602e5a,00170d0000304ab4,00170d000060339c", 
        "asm":	"r" 
    } 
}


Example: Get CO2 Reading

This example shows how to build a control flow to get CO2 sensor reading on selected sensorhub.

1. Build a flow using inject as input node to wsn-senhub node, and debug as output node.

2. Double click on wsn-senhub node to open Edit wsn-senhub node window and configure the node as below

Item Value
Operation Get
Network WSN/WSN0(your Interface MAC)
Sensor ID your CO2 sensorhub MAC
Category SenData
Attribute CO2

3. Connect nodes together and click on Deploy

Wsn-senhub get co2.png


4. Click on the input node and you will see the result in debug window

Wsn-senhub get co2 result.png


5. The output in the debug window is a JSON format string describing the result 

{ 
    "SttatusCode": 200, 
    "Result": { 
        "n":	"CO2", 
        "u":	"ppm", 
        "v":	722, 
        "min":	400, 
        "max": 2000, 
        "asm":	"r", 
        "type": "d", 
        "rt": "ucum.ppm", 
        "st":	"ipso", 
        "exten": "" 
    } 
}


Connect to Freeboard

The output of wsn-related nodes could be redirected as the data source of freeboard. The following example shows how to get the remote CO2 reading and display it on freeboard.

Create URL

Build the control flow using native http as input node of wsn-senhub node, and http response node as output node.

Wsn-freeboard create http-link.png


As the result of this control flow, an URL : http://GatewayIP:1880/co2_reading is created for sending HTML request to get CO2 reading.


Control Flow Code 

The code of the complete control flow is : 

[{"id":"4b342443.b4cbdc","type":"wsn-senhub","z":"36dfd115.c9202e","name":"","operNow":"Get","intfNow":"WSN/WSN0(00170d0000603a0e)","devNow":"00170d0000304ab4","topicNow":"SenData","attribNow":"CO2","setvalue":"0","operSaved":"Get","intfSaved":"WSN/WSN0(00170d0000603a0e)","devSaved":"00170d0000304ab4","topicSaved":"SenData","attribSaved":"CO2","intfOpts":"<option value=\"WSN/WSN0(00170d0000603a0e)\">WSN/WSN0(00170d0000603a0e)</option>","devOpts":"<option value=\"00170d000060339c\">00170d000060339c</option><option value=\"00170d0000304ab4\">00170d0000304ab4</option><option value=\"00170d0000602e5a\">00170d0000602e5a</option>","topicOpts":"<option value=\"Info\">Info</option><option value=\"SenData\">SenData</option><option value=\"Net\">Net</option><option value=\"Action\">Action</option>","attribOpts":"<option value=\"Temperature\">Temperature</option><option value=\"Humidity\">Humidity</option><option value=\"CO2\">CO2</option>","x":388.3333435058594,"y":89.33332824707031,"wires":[["1382358.fec7dca"]]},{"id":"417769.ffbe8898","type":"http in","z":"36dfd115.c9202e","name":"","url":"/co2_reading","method":"get","swaggerDoc":"","x":182,"y":89,"wires":[["4b342443.b4cbdc"]]},{"id":"1382358.fec7dca","type":"http response","z":"36dfd115.c9202e","name":"","x":561,"y":89,"wires":[]}]

To use this example code:

  1. Copy all the code
  2. In Node-RED page, click the function icon on the top-right corner
  3. Select Import -> Clipboard
  4. Paste the code in Clipboard and you can drag the complete control flow into the Sheet

Node-red import flow.png


Display Data in Freeboard

You can select the URL created above as the datasource. Then add a widget to display the sensor reading as dashboard.

Freeboard Web Page 

In the browser, open the Freeboard web page at http://GatewayIP:1880/freeboard/

Freeboard homepage.png


Add New DATASOURCE 

1. Click ADD under DATASOURCES

2. Select a type for DATASOURCE : choose JSON on the list

3. Use http://GatewayIP:1880/co2_reading as URL of datasource

4. NAME for DATASOURCE : CO2_reading in this example

Freeboard add datasource.png


Create Widget 

1. Click ADD PANE

2. Click + to add new widget

Freeboard add pane.png


3. Select a type for WIDGET : choose Gauge on the list

4. VALUE for WIDGET : click DATASOURCE, the NAME of our new created datasource is listed for selection (CO2_reading in this example)

Freeboard widget datasource.png


5. Complete "VALUE" by selecting Result -> v on the list

Freeboard widget value.png


6. Result

Freeboard widget dashboard.png


Node-RED for Alljoyn

We plan to provide three kinds of Node-RED nodes for Alljoyn feature.

  • Action Handler
  • Event Reader & Rule Engine
  • ControlPanel Client

Installation

You can install the node-red-contrib-alljoyn via NPM, or download it on GitHub.

Usage

Please refer to README.

Demo


Node-RED for WSN

Wireless Sensor Network (WSN) is supported on Advantech IoT Gateway and all provided features are basically described by REST API respectively. For users to quickly access the WSN features and build the prototype control flow of application before knowing the detailed REST API manipulation and programming, we provide the following Node-RED nodes to easily read the information and access functions of WSN on Advantech IoT Gateway.

  • wsn-gw
  • wsn-senhub

Installation

You can install the node-red-contrib-wsn via NPM, or download it on GitHub.

Usage

Please refer to README.

Node: wsn-gw

Node to get the information and set functions of a Advantech WSN gateway platform, triggered by an input message. Outputs a msg with msg.payload containing the JSON description of reading or result. During configuration, it will automatically detect available options for Network, Category, and Attribute in real time.

Node: wsn-senhub

Node to get the information and set functions of a remote SensorHub (ex. WISE-1020) controlled by Advantech WSN gateway platform, triggered by an input message. Outputs a msg with msg.payload containing the JSON description of reading or result. During configuration, it will automatically detect available options for Network, on-line sensorhub, and Attribute in real time.

WSN Sensor/Actuator Demo

Besides reading information, we can create more complex control flow using wsn-related nodes introduced above with native Node-RED nodes.

Here is a demo shows how to interact with sensor and actuator, and build a connection between them.

Wsn sen-act demo.png


In this demo, a wsn-senhub node is used to retrieve the CO2 reading from a remote sensor hub. The CO2 reading is verified by the next node using pre-defined threshold value. The result of this judgement is then sent to a wsn-senhub node to turn on/off a fan which is controlled by another remote sensor hub.

Control Flow Code
[{"id":"61ed35df.9e12cc","type":"inject","z":"1811f79d.e7ee08","name":"Go","topic":"","payload":"","payloadType":"none","repeat":"","crontab":"","once":false,"x":101,"y":96,"wires":[["1478e438.eb871c"]]},{"id":"dd51b7f2.22ae48","type":"function","z":"1811f79d.e7ee08","name":"Parse Output","func":"var jsonObj = JSON.parse(msg.payload);\nif(jsonObj.hasOwnProperty('Result')){\n    msg.payload = jsonObj[\"Result\"][\"v\"];\n    return msg;\n    \n}\n//return msg;","outputs":"1","noerr":0,"x":434,"y":95,"wires":[["f927094.f06d8f8","cacb70b9.35349"]]},{"id":"f927094.f06d8f8","type":"switch","z":"1811f79d.e7ee08","name":"CO2 threashold","property":"payload","rules":[{"t":"gte","v":"1000"},{"t":"lt","v":"1000"}],"checkall":"true","outputs":2,"x":235,"y":262,"wires":[["bf362477.40c9d8","46dee3a7.b9211c"],["e7fc8654.180378","3d02f828.c2fd08"]]},{"id":"bf362477.40c9d8","type":"debug","z":"1811f79d.e7ee08","name":"Rule FanOn","active":false,"console":"false","complete":"payload","x":414,"y":205,"wires":[]},{"id":"5a4a76ec.a5b588","type":"debug","z":"1811f79d.e7ee08","name":"CO2 read raw","active":false,"console":"false","complete":"payload","x":435,"y":62,"wires":[]},{"id":"cacb70b9.35349","type":"debug","z":"1811f79d.e7ee08","name":"CO2 read","active":true,"console":"false","complete":"payload","x":628,"y":61,"wires":[]},{"id":"46dee3a7.b9211c","type":"change","z":"1811f79d.e7ee08","name":"Fan On","rules":[{"t":"set","p":"payload","to":"1"}],"action":"","property":"","from":"","to":"","reg":false,"x":414,"y":240,"wires":[["efeeb248.10115","67795763.9886a8"]]},{"id":"e7fc8654.180378","type":"change","z":"1811f79d.e7ee08","name":"Fan Off","rules":[{"t":"set","p":"payload","to":"0"}],"action":"","property":"","from":"","to":"","reg":false,"x":414,"y":274,"wires":[["1fd181af.e02e7e","67795763.9886a8"]]},{"id":"efeeb248.10115","type":"debug","z":"1811f79d.e7ee08","name":"Fan On Out","active":false,"console":"false","complete":"payload","x":596,"y":224,"wires":[]},{"id":"1fd181af.e02e7e","type":"debug","z":"1811f79d.e7ee08","name":"Fan Off out","active":false,"console":"false","complete":"payload","x":594,"y":292,"wires":[]},{"id":"196717b9.e698e8","type":"debug","z":"1811f79d.e7ee08","name":"Fan Set Result","active":false,"console":"false","complete":"payload","x":416,"y":472,"wires":[]},{"id":"3d02f828.c2fd08","type":"debug","z":"1811f79d.e7ee08","name":"Rule FanOff","active":false,"console":"false","complete":"payload","x":416,"y":308,"wires":[]},{"id":"67795763.9886a8","type":"function","z":"1811f79d.e7ee08","name":"Compare Previous Value","func":"context.prevStatus = context.prevStatus || -1;\n//node.log('prevStatus=' + context.prevStatus);\nif (msg.payload != context.prevStatus) {\n    context.prevStatus = msg.payload;\n    msg.payload = '{\"Action\":\"Set\",\"Value\":' + context.prevStatus + '}';\n    return msg;    \n} else {\n    return null;\n}","outputs":1,"noerr":0,"x":639,"y":258,"wires":[["6594c6f5.9a6b38","fab95836.0546a8"]]},{"id":"6594c6f5.9a6b38","type":"debug","z":"1811f79d.e7ee08","name":"Set trigger","active":true,"console":"false","complete":"payload","x":223,"y":438,"wires":[]},{"id":"1478e438.eb871c","type":"wsn-senhub","z":"1811f79d.e7ee08","name":"","operNow":"Get","intfNow":"WSN/WSN0(00170d0000603a0e)","devNow":"00170d0000304ab4","topicNow":"SenData","attribNow":"CO2","setvalue":"","operSaved":"Get","intfSaved":"WSN/WSN0(00170d0000603a0e)","devSaved":"00170d0000304ab4","topicSaved":"SenData","attribSaved":"CO2","intfOpts":"<option value=\"WSN/WSN0(00170d0000603a0e)\">WSN/WSN0(00170d0000603a0e)</option>","devOpts":"<option value=\"00170d0000304ab4\">00170d0000304ab4</option><option value=\"00170d000060339c\">00170d000060339c</option><option value=\"00170d0000602e5a\">00170d0000602e5a</option>","topicOpts":"<option value=\"Info\">Info</option><option value=\"SenData\">SenData</option><option value=\"Net\">Net</option><option value=\"Action\">Action</option>","attribOpts":"<option value=\"Temperature\">Temperature</option><option value=\"Humidity\">Humidity</option><option value=\"CO2\">CO2</option>","x":253,"y":95,"wires":[["dd51b7f2.22ae48","5a4a76ec.a5b588"]]},{"id":"fab95836.0546a8","type":"wsn-senhub","z":"1811f79d.e7ee08","name":"","operNow":"Set","intfNow":"WSN/WSN0(00170d0000603a0e)","devNow":"00170d0000602e5a","topicNow":"SenData","attribNow":"Fan_2","setvalue":"","operSaved":"Set","intfSaved":"WSN/WSN0(00170d0000603a0e)","devSaved":"00170d0000602e5a","topicSaved":"SenData","attribSaved":"Fan 2","intfOpts":"<option value=\"WSN/WSN0(00170d0000603a0e)\">WSN/WSN0(00170d0000603a0e)</option>","devOpts":"<option value=\"00170d000060339c\">00170d000060339c</option><option value=\"00170d0000304ab4\">00170d0000304ab4</option><option value=\"00170d0000602e5a\">00170d0000602e5a</option>","topicOpts":"<option value=\"Info\">Info</option><option value=\"SenData\">SenData</option><option value=\"Net\">Net</option><option value=\"Action\">Action</option>","attribOpts":"<option value=\"Fan_1\">Fan 1</option><option value=\"Fan_2\">Fan 2</option><option value=\"Light\">Light</option>","x":225,"y":472,"wires":[["196717b9.e698e8"]]}]
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