IxorTalk IoT Client

The IxorTalk IoT Client is a Spring Boot library allowing you to connect to the Microsoft Azure and Amazon Web Services IoT offerings.

The library consists of a generic IoT Client (both for sending and receiving messages) and an Azure and AWS implementation This will allow you to connect your Spring Boot application to either Azure IoT HUB or AWS IoT in a matter of seconds. We also provide a sample Spring Boot application showing you how to work with the library.

Cloud IoT offerings

Before you'll be able to use the library, you'll need to register a device on the cloud IoT offering.

Amazon Web Services IoT

Before you'll be able to use the library, you'll need to register a device on AWS IoT. During the creation of a thing in AWS IoT, you'll be prompted to download the x509 certificates (PEM files). Store them somewhere as you'll need them to configure your AWS IoT connection.

Microsoft Azure IoT HUB

If you're using Azure, you'll need to setup an Azure Iot HUB if you haven't done so already and register a device in the IoT hub (don't worry, you don't need a Raspberry PI, you just need to obtain the device connection string. The Spring Boot app running on your computer will act as the device.)

Azure uses a device connection string that you can view in the portal. Take a note of it, as you'll be needing it in the Azure configuration.

Maven Dependencies

This library is published to maven central. In order to use the IoT client, you'll need to add the following maven dependencies

Azure

When using Azure, add the following dependencies:

<dependency>
    <groupId>com.ixortalk</groupId>
    <artifactId>ixortalk-iot-client-spring-boot-starter</artifactId>
    <version>0.0.6</version>
</dependency>
<dependency>
    <groupId>com.microsoft.azure.sdk.iot</groupId>
    <artifactId>iot-device-client</artifactId>
    <version>1.3.32</version>
</dependency>

And make sure you have the following configuration :

ixortalk:
  iot:
    client:
      azure:
        device:
           device-connection-string: "HostName=your-iothub.azure-devices.net;DeviceId=device1;SharedAccessKey=XXXXXXXXXXXXXXXXXXX="

The device connection string can be retrieved from the Azure portal

AWS

When using AWS, add the following dependencies:

<dependency>
    <groupId>com.ixortalk</groupId>
    <artifactId>ixortalk-iot-client-spring-boot-starter</artifactId>
    <version>0.0.6</version>
</dependency>
<dependency>
    <groupId>com.amazonaws</groupId>
    <artifactId>aws-iot-device-sdk-java</artifactId>
    <version>1.1.1</version>
</dependency>

And make sure you have the following configuration

ixortalk:
  iot:
    client:
      aws:
        endpoint: yourendpoint.iot.eu-central-1.amazonaws.com
        client-id: ixortalk-iot-client-${random.int}
        default-topic: sdk/test/java
        certificate-file: /etc/aws_iot/certificate.pem.crt
        private-key-file: /etc/aws_iot/private.pem.key

The pem files can be downloaded when you create a thing in the IoT thing registry.

Publishing messages

To publish a message, simply inject the IoTClient bean and call the publish method.

@Inject
private IotClient iotClient;

@PostMapping
@RequestMapping(method = POST, path = "/send")
public ResponseEntity send(@RequestBody String payload) {
    iotClient.publish(payload);
    return ok().build();
}

When working with the AWS implementaton, you can specify an (optional) topic to publish to. The Azure Device SDK does not support user-defined topics.

Receiving messages

Annotate a method with the @IoTListener annotation and start receiving messages. You can optionally specify the topic you want to listen on (only for AWS). If no topic is provided, the AWS implementation will use the default-topic provided in the config.

@IotListener
public void listen(Object message) {
    LOGGER.info("Consumed message: " + message);
}

License

The MIT License (MIT)

Copyright (c) 2016-present IxorTalk CVBA

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