Lab 36. Registering to all events

Expected completion time of this lab: 10 min.

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

Each MQTT message is contains a topic, a string identifying the type of message. The following topics are 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`

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

Authentication	set to "API Key"
API Key	Essentially a username/password pair to authenticate to the Watson IoT Platform 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:

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