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ClearBlade IoT Core requires TLS version 1.2 or higher. For more guidance on TLS, see the section " Minimum standards for TLS clients " section in Disabling SSLv3 and RC4 on the Google Security Blog.

MQTT bridge

MQTT version 3.1.1 is required.

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  • MQTT QoS 2

  • Arbitrary MQTT topics and subscriptions. For topic requirements, see the section on connecting devices using MQTT section

  • Last Will and Testament (LWT)

  • Retained messages

  • Persistent sessions

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Permitted characters and size requirements

Registries and , device identifiers, and their associated fields , are limited to certain characters. These fields are also limited in size (either length or byte size).

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Resource

Limitations

Registry IDs

  • Permitted characters: [a-zA-Z][-a-zA-Z0-9._+~%]+

  • The first character must be a letter ([a-zA-Z])

  • Cannot start with "goog"

  • Minimum length: 3 characters

  • Maximum length: 255 characters

Device IDs

  • Must be unique within the parent device registry

  • Permitted characters: [a-zA-Z][-a-zA-Z0-9._+~%]+

  • The first character must be a letter ([a-zA-Z])

  • Cannot start with "goog"

  • Minimum length: 3 characters

  • Maximum length: 255 characters

Device metadata keys

  • Permitted characters: [a-zA-Z][-a-zA-Z0-9._+~%]+

  • The first character must be a letter ([a-zA-Z])

  • Minimum length: 1 character

  • Maximum length: 128 characters

  • Maximum combined total size of all device metadata key-value pairs: 256 KB

Device metadata values

  • Minimum size: 0 KB

  • Maximum size: 32 KB

  • Maximum combined total size of all device metadata key-value pairs: 256 KB

Subfolders*

  • Permitted characters: [a-zA-Z][-a-zA-Z0-9._+~%]+

  • The first character must be a letter ([a-zA-Z])

  • Maximum size: 256 bytes

*Subfolders refers refer to the eventNotificationConfigs.subfolderMatches device registry field. It is used when matching MQTT or HTTP subfolders to a Cloud Pub/Sub topic.