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The W5500io-M uses the TCP protocol to connect to Buffalo Cloud.

This article details how to connect to Buffalo Cloud using W5500io - M , including topic subscription and message publishing .

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Published November 20, 2025

Original author: 玩转以太网Original source (new tab)

The W5500io-M uses the TCP protocol to connect to Buffalo Cloud.

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Hardware components

Project description

1. Introduction TCP (Transmission Control Protocol) is the core transport layer protocol of the Internet protocol suite, forming socket communication together with the IP protocol. Its characteristics include: establishing connection-oriented communication through a three-way handshake; achieving ordered and reliable transmission through packet numbering and automatic retransmission; using a sliding window mechanism for flow control; implementing congestion control through algorithms such as slow start; supporting bidirectional full-duplex communication; and providing byte stream services…

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