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Test the Custom Java Toolkit Adapter

Intermediate
15 min.
SAP HANA streaming analytics, Intermediate, Internet of Things, SAP HANA, express edition, Tutorial
Test the MQTT Input Adapter we have created using Mosquitto and HANA Studio.
You will learn

Prerequisites

  • Step 1

    Open a command prompt(CMD) and navigate to the install directory of Mosquitto. The default location is in C:\Program Files(x86)\Mosquitto. Run the Mosquitto broker by typing mosquitto.exe

    Run Mosquitto Exe
  • Step 2

    Set up a streaming project like the one shown below if you haven’t already set up one in the previous tutorial (Where to Place the Custom Adapter Files). The ccl code is provided in the Appendix section.

    Custom Adapter Streaming Project

    Right click on the “Properties” to enable editing.

    Choose the topic for the new MQTT_Input_Adapter1 to subscribe to. In this tutorial, we will use “test”.

    Edit Topic Test

    Replace <your-ip-address> with the ip address of the machine you will be running the Mosquitto MQTT message broker.

    Edit Your IP Address
  • Step 3

    Ensure that the server you have placed your custom adapter, including the required configuration files on is set as the Default Server URL. The Streaming Server being used to compile the project that is using the custom adapter needs to have access to the adapter configuration files during the compile process.

    1. Select Window > Preferences in your IDE.

      Setting Default URL Preferences

    2. With the Preferences window now open, select SAP HANA streaming analytics and, if necessary, change the Default Server URL to match the ip address of the machine you are running the Streaming Server. Click Apply and then OK.

      Setting Default URL Preferences
  • Step 4

    In the SAP HANA Streaming Development perspective right click on the project in the Project Explorer, go to SAP HANA streaming analytics, and click on Compile Streaming Project to compile your project.

    Compile your Streaming Project

    To run your project, right click on the project in the Project Explorer, go to SAP HANA streaming analytics, then run, and click on Run Streaming Project in Workspace to run your project.

    Run your Streaming Project
  • Step 5

    Switch to the SAP HANA Streaming Run-Test perspective from the Quick Access toolbar in the top right corner of your IDE.

    Switch to Run-Test Perspective

    Open the input window by double clicking InputWindow1 in the Run-Test perspective of HANA Studio. This is where the MQTT message will appear.

    Select Input Window 1
  • Step 6

    Open another command prompt (CMD) window and navigate to the install directory of Mosquitto. The default location is in C:\Program Files (x86)/Mosquitto.

    Run the mosquitto_pub.exe program with 

    mosquitto_pub.exe -t“<topic>” –m “<message>” –h “<your-ip-address>”.

    E.g. mosquitto_pub.exe –t "test" –m "Hello World!" –h "1.0.100.200"

    Send an MQTT Message with Mosquitto

    You should now be able to view the published MQTT message in InputWindow1.

    View your MQTT Message

    In the box below, enter the string you have received in the MQTT message on HANA Studio, and click Validate.

  • Step 7
    SQL
    Copy

    CREATE INPUT WINDOW InputWindow1 SCHEMA ( Message string )
PRIMARY KEY ( Message ) KEEP ALL ROWS ;

ATTACH INPUT ADAPTER MQTT_Input_Adapter1
TYPE mqtt_input TO InputWindow1
PROPERTIES  mosquittoServerAddress = 'tcp://<your-ip-address>:1883' ,
topic = 'test' ;
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