Page Comparison

This page lists Cloud IoT Core requirements and related information.

Regions and versions

Cloud regions

Only these cloud regions are available: us-central1, europe-west1, and asia-east1.

Transport

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layer security (TLS)

Cloud 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.

The following These features are not supported:

• MQTT QoS 2

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

• Last Will will and Testament testament (LWT)

• Retained messages

• Persistent sessions

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Secure communication (HTTPS) is required.

Cloud ClearBlade IoT Core supports HTTP 1.1 only (not 2.0).

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).The following table lists the

Each resource’s permitted characters and sizes

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Resource	Limitations
Registry IDs	Permitted characters: [a-zA-Z][-a-zA-Z0-9._+~%]+

First

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._+~%]+

First

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._+~%]+

First

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._+~%]+

First

The first character must be a letter ([a-zA-Z]) Maximum size: 256 bytes

"*Subfolders " refers refer to the eventNotificationConfigs.subfolderMatches field in the device registry , which field. It is used when matching MQTT or HTTP subfolders to a Cloud Pub/Sub topic. For more information, see Creating a device registry with multiple Pub/Sub topics.