Products related to MQTT:
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Linux Kernel Development
Linux Kernel Development details the design and implementation of the Linux kernel, presenting the content in a manner that is beneficial to those writing and developing kernel code, as well as to programmers seeking to better understand the operating system and become more efficient and productive in their coding. The book details the major subsystems and features of the Linux kernel, including its design, implementation, and interfaces.It covers the Linux kernel with both a practical and theoretical eye, which should appeal to readers with a variety of interests and needs. The author, a core kernel developer, shares valuable knowledge and experience on the 2.6 Linux kernel.Specific topics covered include process management, scheduling, time management and timers, the system call interface, memory addressing, memory management, the page cache, the VFS, kernel synchronization, portability concerns, and debugging techniques.This book covers the most interesting features of the Linux 2.6 kernel, including the CFS scheduler, preemptive kernel, block I/O layer, and I/O schedulers. The third edition of Linux Kernel Development includes new and updated material throughout the book: An all-new chapter on kernel data structuresDetails on interrupt handlers and bottom halvesExtended coverage of virtual memory and memory allocationTips on debugging the Linux kernelIn-depth coverage of kernel synchronization and lockingUseful insight into submitting kernel patches and working with the Linux kernel community
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with POE optional Modbus MQTT JSON serial server RS485 RS232 RS422 to Ethernet TCP/IP to serial
with POE optional Modbus MQTT JSON serial server RS485 RS232 RS422 to Ethernet TCP/IP to serial
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Learning eBPF : Programming the Linux Kernel for Enhanced Observability, Networking, and Security
What is eBPF? With this revolutionary technology, you can write custom code that dynamically changes the way the kernel behaves.It's an extraordinary platform for building a whole new generation of security, observability, and networking tools. This practical book is ideal for developers, system administrators, operators, and students who are curious about eBPF and want to know how it works.Author Liz Rice, chief open source officer with cloud native networking and security specialists Isovalent, also provides a foundation for those who want to explore writing eBPF programs themselves. With this book, you will:Learn why eBPF has become so important in the past couple of yearsWrite basic eBPF code, and manipulate eBPF programs and attach them to eventsExplore how eBPF components interact with Linux to dynamically change the operating system's behaviorLearn how tools based on eBPF can instrument applications without changes to the apps or their configurationDiscover how this technology enables new tools for observability, security, and networking
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Learning eBPF: Programming the Linux Kernel for Enhanced Observability, Networking, and Security
Learning eBPF: Programming the Linux Kernel for Enhanced Observability, Networking, and Security
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Can MQTT and SQL Server be installed on the same Ubuntu Server VM?
Yes, MQTT and SQL Server can be installed on the same Ubuntu Server VM. MQTT is a lightweight messaging protocol used for communication between devices, while SQL Server is a relational database management system. They serve different purposes and can coexist on the same server to support different functionalities within an application or system. Just ensure that there are no port conflicts or resource limitations that could impact the performance of both services.
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What is the IP address of the MQTT broker?
The IP address of the MQTT broker will depend on the specific MQTT broker you are using. Typically, the IP address of the MQTT broker will be provided by the administrator or the documentation of the MQTT broker. You may need to contact your network administrator or refer to the documentation of the MQTT broker to obtain the specific IP address. Once you have the IP address, you can use it to connect to the MQTT broker and start publishing and subscribing to MQTT topics.
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How is industrial communication, MQTT, etc. used in process digitalization?
Industrial communication protocols like MQTT are used in process digitalization to enable real-time data exchange and communication between various industrial devices and systems. MQTT allows for efficient and reliable data transmission, which is crucial for monitoring and controlling industrial processes. By using MQTT, organizations can collect and analyze data from sensors, machines, and other equipment, leading to improved operational efficiency, predictive maintenance, and better decision-making. Overall, industrial communication protocols like MQTT play a key role in the digitalization of processes by facilitating seamless connectivity and data exchange in industrial environments.
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How can I use the MQTT protocol to fill the iobroker log file?
To use the MQTT protocol to fill the iobroker log file, you can set up an MQTT client that publishes messages to a specific topic. Then, you can configure iobroker to subscribe to that topic and log the received messages to the log file. This can be achieved by creating an MQTT adapter in iobroker and configuring it to subscribe to the desired topic. Once the MQTT adapter is set up, any messages published to the topic will be logged in the iobroker log file, allowing you to monitor and track the MQTT communication.
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Understanding the Linux Kernel
In order to thoroughly understand what makes Linux tick and why it works so well on a wide variety of systems, you need to delve deep into the heart of the kernel.The kernel handles all interactions between the CPU and the external world, and determines which programs will share processor time, in what order.It manages limited memory so well that hundreds of processes can share the system efficiently, and expertly organizes data transfers so that the CPU isn't kept waiting any longer than necessary for the relatively slow disks.The third edition of Understanding the Linux Kernel takes you on a guided tour of the most significant data structures, algorithms, and programming tricks used in the kernel.Probing beyond superficial features, the authors offer valuable insights to people who want to know how things really work inside their machine. Important Intel-specific features are discussed. Relevant segments of code are dissected line by line.But the book covers more than just the functioning of the code; it explains the theoretical underpinnings of why Linux does things the way it does.This edition of the book covers Version 2.6, which has seen significant changes to nearly every kernel subsystem, particularly in the areas of memory management and block devices.The book focuses on the following topics: * Memory management, including file buffering, process swapping, and Direct memory Access (DMA) * The Virtual Filesystem layer and the Second and Third Extended Filesystems * Process creation and scheduling * Signals, interrupts, and the essential interfaces to device drivers * Timing * Synchronization within the kernel * Interprocess Communication (IPC) * Program execution Understanding the Linux Kernel will acquaint you with all the inner workings of Linux, but it's more than just an academic exercise.You'll learn what conditions bring out Linux's best performance, and you'll see how it meets the challenge of providing good system response during process scheduling, file access, and memory management in a wide variety of environments.This book will help you make the most of your Linux system.
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Linux System Programming
Write software that draws directly on services offered by the Linux kernel and core system libraries.With this comprehensive book, Linux kernel contributor Robert Love provides you with a tutorial on Linux system programming, a reference manual on Linux system calls, and an insider's guide to writing smarter, faster code.Love clearly distinguishes between POSIX standard functions and special services offered only by Linux. With a new chapter on multithreading, this updated and expanded edition provides an in-depth look at Linux from both a theoretical and applied perspective over a wide range of programming topics, including: A Linux kernel, C library, and C compiler overview Basic I/O operations, such as reading from and writing to files Advanced I/O interfaces, memory mappings, and optimization techniques The family of system calls for basic process management Advanced process management, including real-time processes Thread concepts, multithreaded programming, and Pthreads File and directory management Interfaces for allocating memory and optimizing memory access Basic and advanced signal interfaces, and their role on the system Clock management, including POSIX clocks and high-resolution timers
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Mastering Embedded Linux Programming
Harness the power of Linux to create versatile and robust embedded solutionsAbout This Book• Create efficient and secure embedded devices using Linux• Minimize project costs by using open source tools and programs• Explore each component technology in depth, using sample implementations as a guideWho This Book Is ForThis book is ideal for Linux developers and system programmers who are already familiar with embedded systems and who want to know how to create best-in-class devices.A basic understanding of C programming and experience with systems programming is needed. What You Will Learn• Understand the role of the Linux kernel and select an appropriate role for your application• Use Buildroot and Yocto to create embedded Linux systems quickly and efficiently• Create customized bootloaders using U-Boot• Employ perf and ftrace to identify performance bottlenecks• Understand device trees and make changes to accommodate new hardware on your device• Write applications that interact with Linux device drivers• Design and write multi-threaded applications using POSIX threads• Measure real-time latencies and tune the Linux kernel to minimize themIn DetailMastering Embedded Linux Programming takes you through the product cycle and gives you an in-depth description of the components and options that are available at each stage.You will begin by learning about toolchains, bootloaders, the Linux kernel, and how to configure a root filesystem to create a basic working device.You will then learn how to use the two most commonly used build systems, Buildroot and Yocto, to speed up and simplify the development process.Building on this solid base, the next section considers how to make best use of raw NAND/NOR flash memory and managed flash eMMC chips, including mechanisms for increasing the lifetime of the devices and to perform reliable in-field updates.Next, you need to consider what techniques are best suited to writing applications for your device.We will then see how functions are split between processes and the usage of POSIX threads, which have a big impact on the responsiveness and performance of the final device The closing sections look at the techniques available to developers for profiling and tracing applications and kernel code using perf and ftrace. Style and approach This book is an easy-to-follow and pragmatic guide consisting of an in-depth analysis of the implementation of embedded devices.Each topic has a logical approach to it; this coupled with hints and best practices helps you understand embedded Linux better.
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KC868-A6 Smart Home Assistant Relay Switch DIY Module WiFi/Bluetooth ESP32 Development Board MQTT
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Which distro do you use, Linux users?
As an AI, I do not have personal preferences or the ability to use operating systems. However, Linux users often choose their distribution based on their specific needs and preferences. Some popular distributions include Ubuntu for its user-friendly interface, Fedora for its focus on the latest technologies, and Debian for its stability and reliability. Ultimately, the choice of distribution depends on the user's requirements and level of expertise.
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How can one downgrade the Linux kernel?
To downgrade the Linux kernel, you can follow these steps: 1. First, identify the version of the kernel you want to downgrade to and make sure it is available in your distribution's package repository. 2. Next, use the package manager of your Linux distribution to remove the current kernel version. For example, in Ubuntu, you can use the command `sudo apt-get remove linux-image-<version>`. 3. Then, install the desired kernel version using the package manager. For example, in Ubuntu, you can use the command `sudo apt-get install linux-image-<desired_version>`. 4. Finally, reboot your system to load the downgraded kernel. Keep in mind that downgrading the kernel may have implications for system stability and compatibility with hardware and software, so it's important to carefully consider the reasons for downgrading and to backup important data before proceeding.
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What makes the Linux kernel so special?
The Linux kernel is special for several reasons. Firstly, it is open-source, meaning that its source code is freely available for anyone to use, modify, and distribute. This has led to a large and active community of developers constantly improving and updating the kernel. Additionally, the Linux kernel is highly customizable and can be tailored to specific needs, making it suitable for a wide range of devices and systems. Finally, the Linux kernel is known for its stability, security, and performance, making it a popular choice for servers, embedded systems, and other critical applications.
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Why can't the Linux kernel be loaded?
The Linux kernel cannot be loaded because it is a fundamental part of the operating system that needs to be present in memory before any other software can run. The kernel is responsible for managing the system's resources, such as memory, CPU, and devices, and it provides essential services for other software to function. Without the kernel, the operating system cannot start and the computer cannot run any programs. Therefore, the kernel needs to be loaded into memory during the boot process in order for the operating system to become operational.
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