Background From this chapter onwards, unless otherwise specified, the version of MQTT referred to in this article is 3.1.1. The MQTT protocol is one of the commonly used protocols in the Internet of Things, known as a “lightweight IoT messaging protocol”. MQTT and HTTP both belong to the seventh layer (application layer). For friends who … Read more
1. Introduction MQTT, which stands for Message Queuing Telemetry Transport, is an ISO standard (ISO/IEC PRF 20922) based on the publish/subscribe paradigm. It was released by IBM. Due to its lightweight, simple, open, and easy-to-implement characteristics, it is very suitable for IoT scenarios that require low power consumption and limited network bandwidth, such as remote … Read more
Introduction to MQTT The MQTT protocol is currently the most popular Internet of Things protocol in the world, bar none. It provides devices with a stable, reliable, and easy-to-use communication foundation. As of now, there are over a hundred million devices connected via the MQTT protocol, widely used in fields such as IoT and M2M. … Read more
Click the “Blue WeChat Name” Under the Title to Quickly Follow Networking issues are relatively specialized, but understanding some basic knowledge can be very helpful in troubleshooting simple problems. This article from the technical community, “Illustration of 60 Basic Networking Knowledge Points”, explains some basic knowledge related to networks that can be learned and understood. … Read more
From: Juejin, Author: Ruheng Link: https://juejin.im/post/6844903490595061767 1. TCP/IP Model The TCP/IP protocol model (Transmission Control Protocol/Internet Protocol) includes a series of network protocols that form the foundation of the Internet and is the core protocol of the Internet. The reference model based on TCP/IP divides the protocols into four layers: the Link Layer, Network Layer, … Read more
What is a Communication Network There is a network surrounding us at all times, such as telephone networks, telegraph networks, television networks, computer networks, etc.; even within our bodies, there are many network systems, such as the nervous system and the digestive system. The most typical example is the computer network, which is a combination … Read more
EKI00006: Configuration failure explained Error Effects: Emergency stop of the track Inputs for activated commands (robot movement, program start) are disabled. Cause: Framework error in the XML file containing the connection configuration. The XML file containing the connection configuration may be unreadable due to framework errors. Ethernet KRL uses the XPath framework. The syntax specified … Read more
The ping command is one of the most frequently used network commands in Ethernet network basics. Generally, we only use its basic functions. Today, let’s take a detailed look at the 7 basic uses of the ping command. Master these, and you’ll become a pro! 1. Basic of Ping Command 2. Usage of ping -t … Read more
What Are Transport Networks, Core Networks, Transmission Networks, and Access Networks? Today, I will mainly talk about carrier networks, their evolution, and technological trends to help beginners understand the development of networks, services, and technology. Before we delve into the knowledge, let me share a story about sending a package: I want to send a … Read more
Electric valve actuators are ubiquitous in today’s industrial space. They can be found in various industries and applications, including water treatment and wastewater treatment plants, hydroelectric power plants, refineries, shipyards, and many processing industries such as chemicals, food and beverage, pulp and paper, and pharmaceuticals. It is crucial for anyone responsible for selecting and operating … Read more