tessel

Hands-on: Warm-up with Tessel IoT data and MQTT

Prerequisites

You are using SAP Data Hub 2.4, developer edition, and have container datahub running. You can check it by executing

docker ps -f name=datahub

Create a new graph with Terminal only

In SAP Data Hub Modeller go to Graphs tab. Create a new graph.

Save the graph with parameters.

Field	Value
Name	codejam.warmup.mqtttcp.tessel
Description	MQTT-TCP-based IoT data wiretap
Category	CodeJam (type it if not yet existing)

Click on Show Configuration of the graph. Change the icon to a at. Save the graph.

You should see an icon of the graph changed in CodeJam category.

Add MQTT operator

Add an MQTT Consumer

Add an “MQTT Consumer” operator.

Define parameters of the operator as following.

Field	Value
mqttBroker	tcp://mqtt.eclipse.org:1883 tcp://test.mosquitto.org:1883
topic	sapcodejam/+/warmup/#
mqttClientID	ccjdhw<location><your-user-ID>

For MQTT protocol to work it is extremely important that each client has a unique ID!

Add Wiretap operator

Add an “Wiretap” operator.

Connect outmessage out port from "MQTT Consumer" operator to in in port of "Wiretap".

Run the graph

Now you have a graph that can receive data from the MQTT server to display it in wiretap.

Save and run the graph.

Open the wiretap's UI of the running graph and check if IoT data is coming!

Summary

This is the end of the scenario, where you built a graph to learn about:

1. Creating and running a data pipeline,
2. Wiretap operator.