Introduction In unstable network environments, using the TCP transport protocol, MQTT may face challenges in ensuring reliable communication. To address this issue, MQTT introduces a QoS mechanism that provides various message interaction options to meet specific requirements for reliable message delivery in different scenarios. In this article, we will explore the QoS levels 0, 1, … Read more
Note: Please be aware that there is a resource download method at the end of the article. Download and save it as soon as possible to avoid deletion! MQTT Protocol 📡 Have you heard of MQTT? If you are interested in the Internet of Things (IoT), it is definitely a topic you cannot avoid! Today, … Read more
Recently, a paper titled “Do LoRa Low-Power Wide-Area Networks Scale?” published by Martin Bor and Utz Roedig from Lancaster University, UK, pointed out that the scalability of LoRaWAN is currently not very good based on the deployments and tests conducted. According to the tests in the paper, a single LoRaWAN gateway can stably support 120 … Read more
AliMei’s Guide: What is the relationship between the currently popular 5G and edge computing, and where are their points of convergence? How do the IT domain of the Internet and the CT domain of telecommunications merge? What is cloud-network integration? Senior technical experts Nan Shu from Alibaba Damo Academy XG Lab and Yi Ping from … Read more
✨A Small Advertisement: Live Room at the End of the ArticleDraw Huawei Peripheral Benefits~ Have you noticed that many apps now display a “IPv6“ logo at the bottom of the startup page? What exactly is this IPv6? Today, I will explain it to you. What is IPv6? Data transmission and connection between different networks are … Read more
Background Previously, we discussed how to publish messages and their corresponding packets; now let’s look at how the packets for subscribing to a topic are structured. SUBSCRIBE – Subscribe to a Topic The client sends a SUBSCRIBE packet to the server to create one or more subscriptions. Each subscription registers one or more topics of … Read more
The MQTT protocol, which stands for Message Queuing Telemetry Transport, is a lightweight messaging protocol based on the publish/subscribe model, designed for the Internet of Things. Here’s a detailed introduction: Protocol Basics Protocol Overview: MQTT was originally developed by IBM to provide a simple and efficient messaging communication method for resource-constrained devices and low-bandwidth, high-latency … Read more
This article is an excellent piece from the Kanxue forum. Author from Kanxue forumID: emqttx With the arrival of the 5G era, the grand vision of the Internet of Things (IoT) is becoming a reality. The number of connected IoT devices reached 7 billion in 2018[^1], and in the next two years, the number of … Read more
If the number of devices reaches one million, the database will have to handle two million authentication records, which will significantly affect the database’s performance. Is there a batch way to define ACL authentication? 1. ACL Authentication Rules Under normal business usage, the behavior of clients can be restricted using ACL. For example, Client A … Read more
[Background] During the discussion of a control command, we proposed to use the SOME/IP protocol, but the other party suddenly suggested using the MQTT protocol for transmission. This proposal was something we had not encountered before, which left us a bit confused. Therefore, classmate Jiahui conducted an investigation and comparison of the two protocols and … Read more