INVESTIGATION OF THE WEB SERVICE ACCESS MODEL ASP.NET USING A PROXY ASSEMBLY ON THE EXAMPLE OF DEVELOPING A VIDEO RENTAL SERVICE

В статье рассматривается исследование модели соединения Web-приложения и Web-службы напрямую и через прокси. Рассматривается кроссплатформенная высокопроизводительная среда ASP.NET. При разработке используется паттерн MVC. Формирование запросов реализуется с помощью архитектурного стиля REST и протокола передачи гипертекста HTTP. Строится модель взаимодействия Web-приложения и Web-службы. Целью данной работы является исследование данной модели взаимодействия напрямую и через прокси. Были разработаны Web-приложение, являющееся сервисом по аренде видеофильмов и Web-служба, функциональное назначение которой – работа с базой данных Web-сервера. Для реализации прокси сборки было создан отдельный проект. В настройках проекта были прописаны протокол передачи данных, хост API, порт и роутинги перенаправления запросов. Исследование модели проводилось с помощью программного обеспечения Postman и инструментов браузера. Результаты исследования показывают плюсы и минусы использования прокси при взаимодействии Web-приложения и Web-службы. Данная статья поможет заказчикам, разработчикам Web-приложений выбрать модель соединения Web-приложения и Web-службы, соответствующую решаемым задачам. The article considers the study of the connection model of a Web application and a Web service directly and through a proxy. A cross-platform high-performance environment is considered ASP.Net. The MVC pattern is used during development. Request generation is implemented using the REST architectural style and the HTTP hypertext transfer protocol. A model of interaction between a Web application and a Web service is being built. The purpose of this work is to study this model of interaction directly and through a proxy. A Web application was developed, which is a video rental service and a Web service, the functional purpose of which is to work with a Web server database. A separate project was created to implement the build proxy. In the project settings, the data transfer protocol, API host, port and request forwarding routings were registered. A previously developed service was used as an API. The model was studied using Postman software and browser tools. The results of the study show the pros and cons of using a proxy when interacting with a Web application and a Web service. This article will help customers, developers of Web applications to choose a model for connecting a Web application and a Web service that corresponds to the tasks being solved.

Interface for indication and remote control of an unmanned vessel in automatic and manual modes

The article proposes a method for organizing the communication interface of an unmanned vessel and its operator. The interface contains manual controls for the course and speed of the vessel by regulating the angle of the rudder blade shift and the speed of rotation of the propeller shaft, an automatic system for keeping the vessel on a given trajectory for the purpose of navigating the vessel in automatic and manual modes. The interface comprises a system for obtaining filtration, storing the required kinematic and navigation data for identifying mathematical models of the vessel’s movement and the functioning of the autopilot. The interface allows adjusting the PID controller for automatic guidance of the vessel along the trajectory in real time to optimize automatic control, to correct the readings of the GPS and the Earth’s magnetic field sensors, to calibrate the Earth’s magnetic field sensor. The interface includes graphic and digital fields for displaying kinematic and navigation data on the vessel, autopilot and information on the operation of the operator-vessel complex. The interface allows the exchange of data between the operator and the vessel by means of a data transfer protocol via TCP-IP stack protocols on the radio frequencies of public Wi-Fi networks. The interface is created by means of appdesigner tools on the MATLAB platform.

Moisture Level Sensor Using Node-Red

This paper presents the implementation of an Internet of Things (IoT) application that performs the Moisture level sensing through node MCU and Raspberry Pi, and data transfer to the Cloud of the Amazon Web Services or Raspberry Pi. The implementation is done using programming the Node MCU using Embedded C, Raspberry pi is Operated using Raspbian operating system and AWS EC2 Internet of Things platform based on the Node-RED tool installed on the Raspberry Pi and the AWS EC2. The Interconnection of data from the Node MCU to Raspberry Pi is done by MQTT Data Transfer Protocol and Mosquitto Protocol.

The concept of multicast protocol based on network coding

Research subject. The paper presents the concept of a multicast session protocol based on the net-work coding method. Method. Development of a data transfer protocol based on the analysis of existing principles and models of network coding. Core results. The proposed NCDP multicast protocol is de-signed to work over a datagram transport protocol. The basic structure of the NCDP packet header has been developed, taking into account the variability of the protocols used in conjunction with NCDP. Prac-tical relevance. The proposed protocol is intended for use in content delivery systems based on mul-ticast data transmission from several sources.

REQUIREMENTS FOR DATA TRANSFER PROTOCOL WITH EXTERNAL DEVICES WITHIN FIRE NOTIFICATION TRANSMISSION SYSTEMS

Рассмотрены вопросы разработки требований к протоколу обмена данными в системах передачи извещений о пожаре. Разработка требований связана с необходимостью организации информационной совместимости систем передачи извещений о пожаре различных производителей с автоматизированным рабочим местом диспетчера пожарно-спасательного подразделения. Предложен базовый состав информационных данных протокола обмена. Определен общий и минимально необходимый состав информационных атрибутов базы данных по объектам защиты, устанавливаемой на автоматизированном рабочем месте диспетчера пожарно-спасательного подразделения. The issues of elaboration of requirements for data transfer protocol in fire notification transmission systems are considered. The elaboration of requirements is related to the necessity of informational compatibility between fire notification transmission systems of various manufacturers and automated workstation of fire-and-rescue unit dispatcher. The basic structure of information data of the transfer protocol is proposed. The general and minimum required structure of information attributes of the database of objects of protection is determined. This database is installed at the automated workstation of the of fire-and-rescue unit dispatcher.

Method for constructing distributed system components for calculating the stationary mode of an electronic schematic representation of microservices with a full-duplex communication channel

The joint use of a microservice architecture and a full-duplex WebSocket data transfer protocol for building components of a circuit design automation system is considered. Comparison of the organization of API based on the REST approach and using the WebSocket technology is made. The technique of horizontal scaling in systems with microservice architecture and full-duplex communication channels is determined. The advantages of using the WebSocket protocol for the interaction of distributed system components, in particular, with client PWA (Progressive Web Apps) applications, are given. The technique of creating a software implementation of the client and server components based on the full-duplex WebSocket protocol is considered. The technique of mathematical description of multi-pole components is considered. An algorithm for solving the problem of modeling a stationary mode of nonlinear circuits is described.

Color image control information without hardware resources of microcontroller using direct memory access

The approach of the control the color informational display using modern technologies to simplify the implementation of the data transfer protocol and minimize the use of hardware costs in the conditions of instantaneous and extra-large data transfer in continuous mode was considered in the paper. The software and hardware implementation of the control based on STM32F103C8T6 microcontroller using ARM Cortex-M3 technology, WS2812B color LED ribbon and direct memory access technology was proposed.

Equal-cost multi-pathing in high power systems with TRILL

The article presents a hierarchical diagram of the network farm and a model of the network architecture levels. Protocols for disposal full mesh network topologies are considered. Modern data transfer protocol TRILL is presented. Its advantages are analysed in comparison with other possible protocols that may be used in the full-mesh topology. Empirical calculations of data routing based on a Dijkstra's algorithm and a patent formula of the TRILL protocol are given. Two monitoring systems of downloading data channels are described. The data obtained from 40G interfaces through each monitoring systems is presented, and their behaviour is analysed. The main result is that the discrepancy of experimental data with theoretical predictions to be equal to the weight balancing of the traffic when transmitting the batch information over the equivalent edges of the graph. It is shown that the distribution of the traffic over such routes is of arbitrary and inconsistent with the patent formula character. The conclusion analyses issues of the traffic behaviour under extreme conditions.