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This document provides guidance on how to implement and use TCP in CNNs. Given the limited resources on constrained devices, careful 'tuning' of the TCP implementation can make an implementation more lightweight. Many TCP extensions are not required for interoperability with other standard-compliant TCP endpoints. However, many optional TCP extensions require complex logic inside the TCP stack and increase the codesize and the RAM requirements. TCP options) that may improve performance in some environments. TCP is a sophisticated transport protocol that includes optional functionality (e.g. TCP is also used by non-IETF application-layer protocols in the IoT space such as the Message Queue Telemetry Transport (MQTT) and its lightweight variants. Some examples include HTTP/2 and even HTTP/1.1, both of which run over TCP by default, and the Extensible Messaging and Presence Protocol (XMPP). Other application layer protocols not specifically designed for CNNs are also being considered for the IoT space. This the main reason why a CoAP over TCP specification has been developed. However, the integration of some CoAP deployments with existing infrastructure is being challenged by middleboxes such as firewalls, which may limit and even block UDP-based communications. a high complexity, connection-oriented approach incompatibility with radio duty-cycling, and spurious congestion control activation in wireless links) are not valid, can be solved, or are also found in well accepted IoT end-to-end reliability mechanisms (see for a detailed analysis).ДЄt the application layer, CoAP was developed over UDP. However, many typical claims on TCP unsuitability for IoT (e.g. In fact, some TCP features are not optimal for IoT scenarios, such as relatively long header size, unsuitability for multicast, and always-confirmed data delivery.

However, TCP has been criticized (often, unfairly) as a protocol for the IoT. New IETF protocol stack components include the IPv6 over Low-power Wireless Personal Area Networks (6LoWPAN) adaptation layer, the IPv6 Routing Protocol for Low-power and lossy networks (RPL) routing protocol, and the Constrained Application Protocol (CoAP).ДЄs of the writing, the main current transport layer protocols in IP-based IoT scenarios are UDP and TCP. In order to meet the requirements that stem from CNNs, the IETF has produced a suite of new protocols specifically designed for such environments (see e.g. The Internet Protocol suite is being used for connecting Constrained-Node Networks (CNNs) to the Internet, enabling the so-called Internet of Things (IoT). TCP implementations for constrained devices

Error recovery and congestion/flow control Delayed Acknowledgments for single-MSS stacks

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TCP guidance for small windows and buffers TCP implementation and configuration in CNNs

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Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents () in effect on the date of publication of this document. Copyright NoticeД¬opyright (c) 2018 IETF Trust and the persons identified as the document authors. This Internet-Draft will expire on April 11, 2019. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as 'work in progress.'

Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. The list of current Internet-Drafts is at. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF).

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This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. The objective is to help embedded developers with decisions on which TCP features to use. This document explains a number of known and deployed techniques to simplify a TCP stack as well as corresponding tradeoffs. Such environments require a lightweight TCP implementation and may not make use of optional functionality. This document provides guidance on how to implement and use the Transmission Control Protocol (TCP) in Constrained-Node Networks (CNNs), which are a characterstic of the Internet of Things (IoT). TCP Usage Guidance in the Internet of Things (IoT)Дraft-ietf-lwig-tcp-constrained-node-networks-04 Abstract TCP Usage Guidance in the Internet of Things (IoT) LWIG Working Group