A great number of Internet of things (IoT) applications rely on real-time communication (RTC) mechanisms for transmission of media. Essentially, applications analyze and process media to make decisions that typically affect actuation and control of embedded devices. IoT networks, however, are subjected to constrains that limit the computational and resource complexity of all entities involved. This is particularly critical when considering the traditional RTC protocols like real-time protocol (RTP) that was not designed to perform well in the context of low-power lossy networks (LLNs). This paper focuses on alternatives to media transport in IoT networks. Specially, constrained application protocol (CoAP) and the message queuing telemetry transport sensor network protocol (MQTT-SN) are presented as valid technologies for media propagation in LLNs. The paper models and compares CoAP, RTP, and MQTT-SN to determine the most efficient scenario for audio, speech, and video transmission.

中文翻译：

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无线物联网实时通信中的 MQTT-SN、CoAP 和 RTP

大量物联网 (IoT) 应用依赖实时通信 (RTC) 机制来传输媒体。本质上，应用程序分析和处理媒体以做出通常会影响嵌入式设备的驱动和控制的决策。然而，物联网网络受到限制所有相关实体的计算和资源复杂性的约束。考虑到实时协议 (RTP) 等传统 RTC 协议在低功耗有损网络 (LLN) 环境中性能不佳，这一点尤其重要。本文重点介绍物联网网络中媒体传输的替代方案。特别地，约束应用协议 (CoAP) 和消息队列遥测传输传感器网络协议 (MQTT-SN) 被认为是 LLN 中媒体传播的有效技术。