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The Z-Fac0r project followed the AMQP and MQTT protocols for the communication between the components. A message brocker was develope by HOLONIX and was called iLike. The iLike implemented the publish/subscribe mechanism for all components which connected to it. The components were authorised in the iLike brocker and repository with a Bearer Token and then used the mechanism to publish or receive the data. An open API was used to create REST GET calls in order to initiate the communicatio between the component and the brocker. The communication steps between the component and the brocker were:

  1. GET call by the component to initiate communication
  2. The component is authenticated by the iLike machine
  3. The iLike machine appoints the respective topics for the components to publish or subscribe to them
  4. A component published data to a topic and another subcribes to the topic to receive the data

The data from the iLike machines are sent into the cloud to a broker using MQTT protocol (a lightweight protocol that transports messages between devices), it stores the data as messages, so the subscribers can get the values.
MQTT broker can easily scale from a single device to thousands, manage and tracks all client connection state and permit secure connections.