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The new ELSTER SCA file contains the following components :ġ. It is using completely different approach from technical point of view to distribute the ELSTER payload that is sent from the HR or FI business system. #include 'stdlib.h' #include 'string.h' #include 'unistd.h' #include 'MQTTClient.The new ELSTER solution is designed and developed to wrap native OS libraries that are provided by the German tax authorities (ERiC). We will add support for the configuration and shell. A list of supported operations can be added here. Up to this point, it was unknown what exactly the device supports, but the list of supported operations can be modified with the template 114. The QoS selection does not matter for this example.Īfterwards, your MQTTBox should look like this:Īt the current state, the UI does not show any tabs for operations. You can enter both topics after another in the Subscribe field and click Subscribe.

s/e : This will subscribe to an error topic that can be used for debugging.

s/ds : This will subscribe to the static operation templates for the device.

To achieve this, we first need to subscribe to the responsible topic. Now we will send data from the server to the client. So far we have only used MQTT to send data from the client to the server. Now you should see both the Location and the Tracking tab in the device with the Location tab having the same latitude and longitude as the last location event. It can be used with two optional parameters (deviceName, deviceType). The template 100 will create a new device. Although the static templates support automatic device creation, in this example we will create the device manually. The first message sent will create our device. This is the topic used for Cumulocity IoT’s pre-provided static templates. Sending dataĪll MQTT publish messages in this tutorial will be sent to the topic s/us. If the button is green, you successfully established an MQTT connection to Cumulocity IoT. If there is a blue button on the top bar with a label Not Connected, verify your configuration (especially username and password). After clicking Save, you will see a screen similar to the following screenshot. Other configurations like “clean session” are not important for this example. Info: You may review Tenants > Tenant ID and tenant domain in the Cumulocity IoT OpenAPI Specification to get a better understanding between tenant ID and tenant domain. As URL you can use your tenant domain (for example /mqtt) or the domain of the instance in the format mqtt.

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Password: The password of the service user.Ĭumulocity IoT supports MQTT both via TCP and WebSockets.As seen in the example below, for the tenant ID “t76543210” and service user “manga” the username is “t76543210/manga”. You can use the same credentials you use to log into the Cumulocity IoT platform (user alias is not supported). Username – In this case, the username is formed as /.Host – Provide in the URL your tenant domain, for example, /mqtt.Protocol – Select the protocol to be used, for example, mqtt/tcp.To reconnect to the same device, use the same ID. This ID will be linked to your device in Cumulocity IoT. MQTT Client Id – You can use the “Generate a random ID” button (most tools will offer such a button) or provide one yourself.MQTT Client Name – Give your client a name to identify it, for example, Cumulocity IoT MQTT.To configure the MQTT connection, you need to pass the following connection parameters (see the screenshot below).

Talking MQTT Configuring the MQTT connection

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The tenant ID and URL data will also differ from trial tenant information. Info: If you are using a trial tenant, the default user will not work with this tutorial. Info: The screenshots in the tutorial use MQTTBox. You have installed MQTTBox or a similar MQTT tool.You have a valid tenant, a user and a password in order to access Cumulocity IoT.In order to follow this tutorial, check the following prerequisites:

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In this tutorial, you will learn how to use MQTT with Cumulocity IoT using pre-defined messages (called “static templates”). It also contains examples on how to use the MQTT client with Cumulocity IoT employing pre-defined messages (called “static templates”) using C, Java, JavaScript, Python and C#.Īll the examples can be downloaded from the GitHub repository. In this section, Hello MQTT provides an easy introduction to the Cumulocity IoT MQTT protocol using a MQTT cross platform application.