Internet of Things exercise on IBM Bluemix

IBM BlueMix Workshop – Internet of Things Lab

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Node-‐RED -‐ Sample Application It's easy to build an application with Node-RED and use the data that you've published to the IBM Internet of Things cloud. This Lab shows you how. The Lab has a ready-made flow that processes temperature readings from a simulated device. The flows checks these readings against a threshold, then tells you whether the temperature is safe. Imagine that we're monitoring a CPU temperature from a real device. Step 1 – Deploy the Internet of Things boilerplate

• Login to Bluemix (https://ace.ng.bluemix.net) • Select the ‘CATALOG’ tab • Select the ‘Internet of Things’ boilerplate

• Select the ‘CREATE APPLICATION’ button, provide a name and unique hostname for the application

• Select the ‘CREATE’ button to deploy the boilerplate.


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Step 2 – Launch the Node-‐RED flow editor • When the application is deployed and is running click the route to open the

deployed application

• The Node-RED application will open in your browser. Select the ‘Got to your

Node-RED flow editor’ button

Step 3 – Import the sample flow This step imports the sample flow to the Node-RED editor. Node-RED flows can be imported and exported as JSON text, so to import the flow you are going to copy the flow below and import it to Node-RED ------------------------------Select below this line----------------------------------------------- [{"id": "f9a7b43b.065848","type": "iot","name": "","deviceId": "00:00:00:00:00:00","messageType": "*","x": 155,"y": 239,"z": "65624723.9a9db8","wires": [["9db76969.624898","9e041be9.61fbe8"]]}, {"id": "9db76969.624898","type": "function","name": "temp","func": "return {payload:msg.payload.d.temp};","outputs": 1,"x": 318.5,"y": 237,"z": "65624723.9a9db8","wires": [["2b6f31bc.d490ce"]]}, {"id": "2b6f31bc.d490ce","type": "switch","name": "temp thresh","property": "payload","rules": [{"t": "lte","v": "40"},{"t": "gt","v": "40"}],"checkall": "true","outputs": 2,"x": 467.5,"y": 238,"z": "65624723.9a9db8","wires": [["34b29de.fcb4d62"], ["bb90881b.446f78"]]},{"id": "10cf85ac.ef307a","type": "debug","name": "cpu status","active": true,"complete": "false","x": 778.5,"y": 235,"z": "65624723.9a9db8","wires": []},{"id": "9e041be9.61fbe8","type": "debug","name": "device data","active": false,"complete": "false","x": 318.5,"y": 148,"z": "65624723.9a9db8", "wires": []},{"id": "34b29de.fcb4d62","type": "template","name": "safe","template": "Temperature ({{payload}}) within safe limits", "x": 631.5,"y": 189,"z": "65624723.9a9db8","wires": [[ "10cf85ac.ef307a"]]},{"id": "bb90881b.446f78","type": "template", "name": "danger","template": "Temperature ({{payload}}) critical", "x": 630.5,"y": 283,"z": "65624723.9a9db8","wires": [["10cf85ac.ef307a"]]}]

------------------------------Select above this line----------------------------------------------- • Select the text above and copy to you system clipboard • In the Node-RED flow editor select the menu (upper right of screen). Select

‘Import from…’ then ‘Clipboard…’


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• This will open an Import nodes window. Select into the window and paste the

content of your system clipboard, then press OK

• You should see the flow in the flow editor connected to your cursor. Move

the cursor to the left of the window to place the flow and left-click

Step 4 – Configure the flow for a simulated device and deploy the flow There is a simulated device running on BlueMix ready for you to test.

• In a new browser window open http://iotsensor.ng.bluemix.net/


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• The hardware MAC address of the simulated device is in the top right corner. You can click the address to open up a web console which shows what the device is publishing to the IBM Internet of Things cloud.

• In the Node-RED flow editor double-click the iot input node (first node in

flow with 00:00:00:00:00:00 as title). This will bring up the node editor window

• Enter the MAC address of your device simulator

• Then press OK to make the change • The Deploy button now becomes active, so click it to deploy the flow

• You will get a confirmation message that the flow is deployed.


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Step 5 – Test the flow • In the side bar switch to the debug tab. You should now see the debug

messages from the flow, showing the temperature published by the sensor.

• You can enable or disable either of the 2 debug nodes in the flow by clicking

in the area to the right of the debug node

• Try enabling the device data debug node to see the data being received by the

iot input node. • In the sensor simulator window try increasing the temperature being reported

and watch the debug messages report the new temperature. • Keep increasing the temperature until you get to 41ºC. The debug message

should now be advising that the temperature is critical Step 6 -‐ Understanding the flow You can examine the content of any node by double clicking it. If you modify a node or add additional nodes the deploy button will become active allowing you to deploy the modified flow. The sample flow does the following:

1. The iot input node subscribes to receive messages from the Internet of Things

cloud for a specific device


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2. A function node takes the data from the iot node and extracts the temperature from the message

3. A switch node compares the temperature value and sends the flow one of 2

ways depending on the temperature value

4. Function nodes create the message to be displayed in the debug node

5. The debug node displays the message to the debug panel

Once you have created a flow it can be exported to the clipboard window via the menu. This allows you to share a flow or put it into source control. More information on Node-RED and the IBM Internet of Things can be found : http://nodered.org https://www.ibmdw.net/iot/ Note: The mongodb storage nodes will work with the TimeSeriesDatabase that is deployed with the boilerplate.

Internet of Things exercise on IBM Bluemix

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Transcript of Internet of Things exercise on IBM Bluemix