Application of MQTT protocol in millimeter wave radar

Categories:Blog
Author:Boris
Origin:
Time of issue:2024-04-10 16:29
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(Summary description)

Application of MQTT protocol in millimeter wave radar

(Summary description)

Categories:Blog
Author:Boris
Origin:
Time of issue:2024-04-10 16:29
Views:

MQTT concept explained

MQTT (Message Queuing Telemetry Transport) is a lightweight, based on the TCP/IP protocol stack built asynchronous communication, and publist-subscribe mode of the message transport protocol. It is suitable

for resource-constrained devices and low bandwidth, high latency or unstable network environment. It is popular in iot applications and enables efficient communication between sensors, actuators, and other devices. MQTT has gradually become the most popular protocol in the field of Internet of Things (IoT), and it is also the most mainstream transport protocol of major iot platforms at home and abroad. Many devices on Alibaba

Cloud iot platform are accessed through MQTT.

Introduction to the definition of millimeter Wave radar

In recent years, the popular millimeter wave radar is increasingly used in the field of smart home. Through action recognition and space occupancy detection, it realizes intelligent sensing such as motion

direction detection, distance change detection, and indoor space positioning, and then interacts with smart home to develop a variety of scenarios. The application of millimeter wave radar technology to non-invasive

health monitoring, integration into home and clinical equipment, measurement of vital signs and sleep monitoring is another important application direction.

Q: What is millimeter-wave radar? A: millimeter wave radar is a radar that

works in millimeter wave band (millimeter-wave) detection. According to

the application scenario, it can be divided into human perception, fall

alarm, and physical sign detection.

Q: What are the characteristics of millimeter-wave radar?

A: Non-contact: most smart pension products on the market need to contact

the body of the elderly or wear relevant equipment. The millimeter wave

radar can achieve non-contact accurate monitoring of vital signs, and the user experience is excellent.

Privacy protection: Compared with traditional video surveillance, millimeter-wave radar can avoid the discomfort of monitoring, especially when the elderly live alone at home, it can not only protect the privacy

of the family space, but also detect whether the breathing and heartbeat are normal in time.

Low radiation: radiation is much lower than mobile phone and WIFI, long-term use of unburdened power does not exceed 1w, low heat, power saving, suitable for long-term use. The millimeter-wave intelligent wireless monitor developed by Dalian

Leibo Technology is a non-contact monitor for the elderly who live alone, the elderly, and the elderly in nursing home. Through the millimeter-wave radar, the precise perception of human posture and vital signs can know whether there is someone in the room, the activity of the user in the room is still, and whether the alarm event such as fall and long lag occurs. At night, it can sense whether the user leaves the bed, grasp the safety

status and physiological indicators of the elderly in real time, and report the alarm of intelligent falls instantly to avoid safety accidents,

protect the safety of the elderly in the whole scene, reduce the workload of nursing staff, and improve the quality of service.

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The use of MQTT in millimeter Wave Radar

Scenarios for MQTT usage in millimeter Wave radar

In the application scenario of millimeter wave radar, if it involvesthe requirements of remote monitoring, data transmission, or inter-device

communication, MQTT may be a suitable choice.

In the field of smart home, millimeter-wave radar can be used in scenarios such as human body sensing and fall detection, while MQTT can

help achieve remote transmission and monitoring of these data.

In the field of security, mmWave radar can be used for covert detection of people and objects, and MQTT can realize real-time transmission of

these detection data and alarm.

In intelligent transportation is an important application field. Millimeter wave radar can be used for vehicle detection, speed measurement and distance estimation in the field of transportation. Through the MQTT

protocol, millimeter wave radar can transmit these data to the traffic management center or other related equipment in real time, realize the intelligent control and optimization of traffic signals, and improve road

safety and traffic efficiency. Industrial automation is also a potential field for the combined

application of MQTT and millimeter wave radar. In industrial environments, MMWave radar can be used for tasks such as object detection, position tracking, and automated control. The MQTT protocol can ensure the reliable

transmission of these data within or across factories, enabling intelligent and automated management of production lines.

Principle of MQTT protocol

MQTT protocol implementation

The implementation of the MQTT protocol requires the completion of

communication between the client and the server. In the communication

process, there are three identities in the MQTT protocol: Publish, Broker

(server) and Subscribe. Among them, the message publisher and subscriber

are the client, the message broker is the server, and the message publisher

can be a subscriber at the same time.

The network transports and applies messages

MQTT builds the underlying network transport: it establishes the

connection from the client to the server, providing an ordered, lossless,

byte-based bidirectional transfer between the two. When application data

is sent over the MQTT network, MQTT associates Quality of service (QoS)

associated with it with the Topic name.

MQTT client

An application or device that uses the MQTT protocol and always

establishes a network connection to the server. The client can:

Publish information that other clients may subscribe to

Subscribe to messages published by other clients

Unsubscribe or delete messages from your app

Disconnect from the server

MQTT server The MQTT server is called a "message Broker" and can be an application

or a device. It sits between message publishers and subscribers, and it

can:

Accept network connections from customers

Accept application information posted by customers

Handle subscription and unsubscription requests from clients

Forward application messages to subscribed customers.

Advantages of MQTT in millimeter Wave Radar

Reliability: According to the QoS transmission quality level, it is ensured that data with high validity requirements will not be lost, and data with low validity requirements will not occupy resources.

Asynchronous communication: MQTT supports asynchronous communication, which can realize real-time message passing in millimeter wave radar. This is very important for mmWave radar sensors that need to respond in a timely manner.

Flexibility: Depending on the Topic name/filtering rules, you can freely design the topic to be applied to a large number of mmWave radar usage scenarios.

Real-time: MQTT session keeping and online status awareness functions can improve the message integrity ofmmWave radar in the offline state. Security: MQTT can ensure the secure transmission of messages through

mechanisms such as encryption and authentication

MQTT message Topic designMQTT Topic Topic definition

MQTT protocol forwards messages based on topics. MQTT topics are not created in advance and are automatically created by the Broker when a publisher sends a message to a topic or a subscriber subscripts to a topic.

The early development of radar equipment docking client platform is mainly divided into two steps, one is to configure the address information of the client and server, and the other is to configure the small program

to connect to the server. The client server address can be directly configured by the factory when the customer sends out bulk goods, and the project can be directly connected to the Internet.

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MOTT protocol format for 60G millimeter wave radar equipment helps

users how to obtain and set radar data, which is convenient for development and use. The data content is transmitted in json format. Report the subject through which the radar device reports the data and

sets the response message

Topic:/Radar60FL/ device ID/sys/property/post

Issue a topic through which the customer issues a message to the radar

device

Topic:/Radar60FL/ device ID/sys/property/set

MQTT data transfer quality

MQTT QoS definition

MQTT provides three kinds of Quality of Service (QoS) to guarantee the reliability of messages in different network environments.

QoS 0: Messages are delivered at most once.

Once the MQTT Broker sends a message, it does not need to care whether the client receives it or not. If the message is lost by the current client,

nothing is done.

QoS 1: The message is delivered at least once.

Includes a simple retransmission mechanism that will be performed if the sender believes that the message was not successfully sent or accepted. However, this mode can only guarantee the successful arrival of the message, but cannot guarantee the repeated arrival of the message.

QoS 2: Messages are delivered only once.

This model designs complex resend and duplicate message discovery mechanism to ensure that the message can reach the other party

successfully, and strictly controls the arrival only once.

Note 1: The higher the QoS level, the higher the message reliability, but the more complex the message interaction pattern, at the same time, the

higher the resource consumption and message delay. Therefore, the QoS level is not the highest optimal. Platforms and terminals can choose the

appropriate QoS level according to their own network level and business

scenarios.

Note point 2: QoS in MQTT publish and subscribe operations is set separately. If the QoS level set by the two sides is not consistent,

consumption degradation will occur downward compatibility. The QoS level at the time of publication represents the QoS level used when the message is sent to the MQTT Broker, and the QoS level at the time of subscription represents the maximum QoS level used when the MQTT Broker sends the

message to itself.

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