Page Comparison

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• The IBM Watson IoT platform acts as an MQTT broker: applications publish message messages to it, others subscribe to messages.

• Each MQTT message is contains a topic, a string identifying the type of message. The following topics are examples of what is used by Watson IoT:
   

  iot-2/type/mote/id/00-17-0d-00-00-38-04-35/evt/oap.digital_in.D0/fmt/json
  a "digital_in" OAP notification coming from mote 00-17-0d-00-00-38-04-35
  iot-2/type/mote/id/00-17-0d-00-00-60-4e-1f/evt/hr.Device/fmt/json
  a device health report received from mote 00-17-0d-00-00-60-4e-1f
  iot-2/type/mote/id/00-17-0d-00-00-58-fe-43/evt/oap.temperature/fmt/json
  a temperature measurements from mote 00-17-0d-00-00-58-fe-43

  
  

• in Node-RED, you subscribe to messages through the ibmiot input node:
  

• by double-clicking on that node, you can configure the following (leave other fields untouched):

  Authentication	set to "API Key"
  API Key	Essentially Functions like a username/password pair to authenticate to the Watson IoT Platform Tip icon false You instructor has already created a key. Ask for it.
  Input Type	set to "Device Event"
  Device Type	allows you to choose the type of device you want to subscribe to, in this lab either "manager" or "mote"
  Device Id	unique identifier of the device, in this lab its MAC address, e.g. "00-17-0d-00-00-58-f5-23"
  Event	The type of event you want to subscribe to, e.g. "oap.temperature"

  
  

• start by creating the following flow in which you subscibe to all devices types, all device ids, all event types and all formats.
   
• make sure you see the messages appear in the debug tab

• modify the flow by inserting a function node with the following code:

  Code Block
  var count = flow.get('count')||0; count += 1 flow.set('count',count); msg.payload = count; return msg;

  
  
  

• What does the code function above do?

  Info
  icon false title Answer 1:

  
  

• How many messages are there published per minute to the Watson IoT platform? 

  Info
  icon false title Answer 2:

  
  

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