Quotas and limits

    In the Yandex IoT Core service, the following limitations apply:

    • Quotas are organizational restrictions that can be changed by technical support on request.
    • Limits are technical restrictions due to the Yandex.Cloud architecture specifics. The limits cannot be changed.

    You can view your current account quotas in the management console.


    Type of limit Value
    Maximum size per message 256 KB
    Frequency of sending messages per device No more than once per second
    Maximum length of the subtopic name 1024 symbols
    Maximum number of aliases per device 5


    Message delivery is not guaranteed if the limits are exceeded.

    Other restrictions

    • The Retain flag is not supported. When using it, the MQTT broker saves the flagged message and sends it the next time you subscribe a device or registry to a topic.
    • Persistent Sessions, when the MQTT broker saves information about a client (device or registry) to reconnect faster, aren't supported.