SYSTEM DESCRIPTION 3
8027311 / V1-0/2022-04|SICK
Subject to change without notice
OPERATING INSTRUCTIONS|TDC-E (Telematic Data Collector)
Fig. 7: MQTT protocol
Legend
A MQTT client
B MQTT message broker
C MQTT client
1 Provides topics (publish)
2 Subscribes to topics (subscribe)
• MQTT is a client-server protocol that follows the publish/subscribe principle.
• Clients send messages with a topic to the MQTT message broker after the connection
is established, which classifies the message hierarchically (e.g. “TDC-E temperature
sensor/temperature”).
• Messages always consist of a topic and the message content.
• Clients can subscribe to these topics, with the MQTT message broker forwarding the
received messages to the appropriate subscribers.
• It is the TDC-E that assumes the publisher role within the gateway system.
• It uses the MQTT protocol to send topics containing sensor data within a defined
structure.
• The client server is the subscriber of this data.
• Thanks to the defined topic structure, this service is able to retrieve the messages and
continue to process them.
MQTT
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