Data communication management between gateway and OceanConnect is based on the following () protocol connection?

MQTT (Message Queuing Telemetry Transport) is a lightweight, publish-subscribe network protocol designed for M2M (machine-to-machine) communication in environments with constrained devices and low-bandwidth networks. It is the standard and primary protocol used for data communication between IoT gateways and the Huawei Cloud IoT Platform (formerly OceanConnect). Its efficiency and reliability make it ideal for transmitting telemetry data from a gateway to the cloud platform for processing and management.

A. SMTP is a protocol for sending and receiving email, not for IoT device data telemetry.
C. ICMP is used for network diagnostics and error reporting (e.g., ping), not for application data transfer.
D. Telnet is an unsecure remote terminal protocol and is not suitable for automated, secure M2M communication.

1. Huawei Cloud. (2023). IoTDA Developer Guide. Section: "Protocol Description > MQTT-based Communication." This official documentation explicitly states that devices can use the MQTT protocol to connect to the Huawei Cloud IoT Platform (IoTDA).

2. Huawei Technologies Co., Ltd. (2020). HCIA-IoT V2.5 Training Material. Chapter 5, "Huawei IoT Platform," describes the platform's architecture and specifies MQTT as a key protocol for device access.