The Internet of Things (IoT) general protocol refers to a communication protocol applicable to a variety of Internet of Things applications, which can be used to realize interconnection and data transmission between devices. Here are some common IoT common protocols:
MQTT (Message Queuing Telemetry Transport): MQTT is a lightweight publish-subscribe message transport protocol that is widely used for message delivery between IoT devices. It features low bandwidth and low power consumption, making it suitable for small and low power consumption devices. MQTT supports multiple transport layer protocols, such as TCP/IP, WebSocket, etc.
CoAP (Constrained Application Protocol): CoAP is an application layer protocol designed for IoT devices in constrained environments. It uses an HTTP-like request-response model, supports RESTful style communication, and is suitable for resource-constrained devices and networks. CoAP typically runs over UDP and provides a low-overhead communication and resource discovery mechanism.
HTTP (Hypertext Transfer Protocol): Although HTTP is a protocol designed for the Web, it is also widely used in the Internet of Things. By using the HTTP protocol, IoT devices can communicate and be remotely controlled through standard web interfaces. HTTP uses TCP as the transport layer protocol to provide reliable data transmission.
DDS (Data Distribution Service): DDS is an open standard for real-time data communication. It provides high-performance data distribution and real-time data exchange, and supports publish-subscribe and request-response patterns. DDS is suitable for large-scale IoT systems and real-time data transmission applications.
AMQP (Advanced Message Queuing Protocol): AMQP is a message-oriented protocol for reliable transmission of messages. It supports multiple programming languages and platforms, provides strong message routing and reliability guarantees. AMQP is suitable for messaging and data exchange in IoT.
OPC UA (OPC Unified Architecture): OPC UA is an open standard communication protocol for interconnection between devices in industrial automation and the Internet of Things. It provides secure, reliable, and cross-platform communication, and supports multiple data models and device interfaces.
These general protocols have different characteristics and scope of application, and the appropriate protocol can be selected for communication and data exchange according to specific IoT application requirements.