IoT Core Instance

Resource partitioning unit of the IoT core suit IoT Core. Each instance is a separate namespace, with its own identity which is the Core ID. Different instances shall be isolated with each other.

Device

A cloud port mapping of the entity world, which is the minimum unit of IoT Core connection, and every device can own its identity (DK/SK) and theme list.

MQTT

MQTT (Message Queuing Telemetry Transport) is a message transmission protocol in Publish/Subscribe mode based on the binary client-server architecture of message, which was first proposed by IBM, and now has become the prevailing specification of the industry. It is more in line with the machine-to-machine communication (M2M) and IoT environment (IoT).

DK（Device Key）

The key required for device connection is used to generate the username required by MOTT connection.

SK（Device Secret Key）

The key required for device connection is used to generate the password required by MOTT connection.

Shadow

The device shadow reflects one object (device) in the physical world, and is the [shadow] of the object on the cloud or [digital twin]. During the operation, the object reports the monitoring value to the shadow, which stores the last reported status of the device with a json file, and you can access directly through MQTT or HTTP. At the same time, the thing shadow also provides counter-control functions.

Template

The device template is used to create a kind of device in batch, and the theme template is available currently. Devices are created with the same theme template, and have the same privilege for the theme.

Topic

The topic is applied in MQTT client. Topic rules allows strings to contain wildcard character “#” or “+”.

Operation Privilege

You can customize the topic operation privilege to the device in theme templates. Currently, based on MQTT protocol, IoT Core supports “Publish” and “Subscribe”, two privileges.