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Eclipse Ditto™: Digital Twin framework - Examples

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# Eclipse Ditto :: Examples

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This repository contains examples and demonstrations of how to use [Eclipse Ditto](https://github.com/eclipse/ditto).

# Projects

## [grove control](grove-ctrl/)

The grove control project shows the different communication possibilities
using Eclipse Ditto on your local machine and a Rasperry Pi with GrovePi+ board
as IoT device. This project uses Python for the Raspberry Pi code and jQuery for the Web UI.

## [Rest to WebSocket demo](rest-to-websocket/)

This example shows how to combine the REST and WebSocket API of Eclipse Ditto.
This is demonstrated using a Frontend that sends REST requests and
a Thing that has a WebSocket connection to Ditto and uses it to receive
and respond to Messages. This project requires a running Eclipse Ditto
instance and a modern web browser.

## [Octopus via Hono to Ditto](octopus-via-hono/)

Arduino based example on a ESP8266 board publishing read out sensor values in Ditto Protocol via
the MQTT endpoint of [Eclipse Hono](https://www.eclipse.org/hono/) to a digital twin in Ditto:

- BME680 sensor
  - temperature
  - humidity
  - barometer
- BNO055 sensor
  - temperature
  - linear acceleration
  - angular velocity
  - gravity
  - absolute orientation
  - accelerometer
  - magnetometer
- power voltage

## [IoT-Device connected directly to Ditto via MQTT - controlled by a custom solution](mqtt-bidirectional/)

This example demonstrates how to connect an Arduino based device to Eclipse Ditto and how
payload mapping can be utilized to transform its telemetry data into a valid digital twin representation.
Furthermore a simple front-end allows manipulating the digital twin and receives twin updates
via SSE (Server Sent Events).

### Parts of this example

- Arduino
  - How to establish a network connection
  - How to establish a MQTT connection
  - How to receive and publish valid JSON data
- Front-end
  - How to use Ditto's HTTP API for
    - Create policy and things
    - Create a connection (MQTT)
    - Send live messages to device
    - Listen to server sent events
- Eclipse Ditto
  - How to set up Eclipse Ditto with Docker (alternatively use Ditto's Sandbox)
  - How to apply payload mapping on incoming messages from a connection

## [Quick introduction to MQTT in Ditto](mqtt-quick-introduction/)

This example demonstrates how to setup step by step MQTT connection in Ditto.
It presents how to updates things in Ditto and how to receive notifications that something was changed.

## [Samples for Microsoft Azure users](azure/)

Samples to leverage Eclipse Ditto capabilities with Microsoft Azure services.

## [kata](kata/)

A code kata is a way of learning new things and consolidating what has been learned. The presented katas serve to 
understand specific features of ditto better.

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