Subtopic
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Updated at June 15, 2026
Warning
Yandex IoT Core is no longer available to new users.
Current users can create resources until November 1, 2026. Afterwards, the service will go read-only and cease to operate on December 1, 2026. For more information on the timing and procedure, see Service shutdown.
A subtopic is a custom topic created within existing device and registry topics. You do not need to create a subtopic, just start sending messages to it.
Everything that comes after a device or registry topic and separated by / is considered a subtopic:
<device_or_registry_topic>/<subtopic_name>
Examples of subtopics:
$devices/<device_ID>/events/bedroom/temperature: Subtopic to receive bedroom temperature data.$devices/<device_ID>/state/bedroom/temperature: Subtopic to receive bedroom temperature data, which stores the most recent message sent to this subtopic.$registries/<registry_ID>/commands/bedroom: Subtopic to send commands to all devices in the bedroom.$registries/<registry_ID>/config/bedroom: Subtopic to send commands to all devices in the bedroom, which stores the last message sent to this subtopic.
Subtopics are based on the same operating principles and limits as topics.