Communication protocols for clouds

Cloud IoT Core supports two protocols for device connection and communication: MQTT and HTTP. Devices communicate with Cloud IoT Core across a "bridge" — either the MQTT bridge or the HTTP bridge. The MQTT/HTTP bridge is a central component of Cloud IoT Core, as shown in the components overview.When you create a device registry, you select protocols to enable: MQTT, HTTP, or both.

MQTT is a standard publish/subscribe protocol that is frequently used and supported by embedded devices, and is also common in machine-to-machine interactions.

HTTP is a "connectionless" protocol: with the HTTP bridge, devices do not maintain a connection to Cloud IoT Core. Instead, they send requests and receive responses. Cloud IoT Core supports HTTP 1.1 only (not 2.0).Both bridges use public key (asymmetric) device authentication and JSON Web Tokens (JWTs). For details, see the section on device security.

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