The Internet of Things (IoT) is a large-scale network of devices capable of sensing, data processing, and communicating with each other through different communication protocols. In today's technology ecosystem, I...The Internet of Things (IoT) is a large-scale network of devices capable of sensing, data processing, and communicating with each other through different communication protocols. In today's technology ecosystem, IoT interacts with many application areas such as smart city, smart building, security, traffic, remote monitoring, health, energy, disaster, agriculture, industry. The IoT network in these scenarios comprises tiny devices, gateways, and cloud platforms. An IoT network is able to keep these fundamental components in transmission under many conditions with lightweight communication protocols taking into account the limited hardware features (memory, processor, energy, etc.) of tiny devices. These lightweight communication protocols affect the network traffic, reliability, bandwidth, and energy consumption of the IoT application. Therefore, determining the most proper communication protocol for application developers emerges as an important engineering problem. This paper presents a straightforward overview of the lightweight communication protocols, technological advancements in application layer for the IoT ecosystem. The survey then analyzes various recent lightweight communication protocols and reviews their strengths and limitations. In addition, the paper explains the experimental comparison of Constrained Applications Protocol (CoAP), Message Queuing Telemetry (MQTT), and WebSocket protocols, more convenient for tiny IoT devices. Finally, we discuss future research directions of communication protocols for IoT.展开更多
his paper studies the vehicle CAN bus control technology, and analyzes the control system of automobile based on CAN technology. This paper focus on the design of single-chip microcomputer STC89C52 be as the platform ...his paper studies the vehicle CAN bus control technology, and analyzes the control system of automobile based on CAN technology. This paper focus on the design of single-chip microcomputer STC89C52 be as the platform to achieve the design of CAN bus, introduce in detail the structure and working principle of SJA1000 and PCA82C250, and on basis of it, we design the CAN bus interface, and gives the hardware circuit design and software process of SJA1000 initialization, receiving, sending message. The system can give some subsequent reference for CAN bus application.展开更多
文摘The Internet of Things (IoT) is a large-scale network of devices capable of sensing, data processing, and communicating with each other through different communication protocols. In today's technology ecosystem, IoT interacts with many application areas such as smart city, smart building, security, traffic, remote monitoring, health, energy, disaster, agriculture, industry. The IoT network in these scenarios comprises tiny devices, gateways, and cloud platforms. An IoT network is able to keep these fundamental components in transmission under many conditions with lightweight communication protocols taking into account the limited hardware features (memory, processor, energy, etc.) of tiny devices. These lightweight communication protocols affect the network traffic, reliability, bandwidth, and energy consumption of the IoT application. Therefore, determining the most proper communication protocol for application developers emerges as an important engineering problem. This paper presents a straightforward overview of the lightweight communication protocols, technological advancements in application layer for the IoT ecosystem. The survey then analyzes various recent lightweight communication protocols and reviews their strengths and limitations. In addition, the paper explains the experimental comparison of Constrained Applications Protocol (CoAP), Message Queuing Telemetry (MQTT), and WebSocket protocols, more convenient for tiny IoT devices. Finally, we discuss future research directions of communication protocols for IoT.
文摘his paper studies the vehicle CAN bus control technology, and analyzes the control system of automobile based on CAN technology. This paper focus on the design of single-chip microcomputer STC89C52 be as the platform to achieve the design of CAN bus, introduce in detail the structure and working principle of SJA1000 and PCA82C250, and on basis of it, we design the CAN bus interface, and gives the hardware circuit design and software process of SJA1000 initialization, receiving, sending message. The system can give some subsequent reference for CAN bus application.
