The Internet of Things involves extending internet connectivity to anything from standard devices like traditional desktops, laptops, smartphones and tablets to connecting physical devices and everyday objects that are not internet-enabled. These devices are embedded with program technology, can communicate and interact through the Internet, and can be remotely monitored and controlled.
Today, overall, China’s Internet of Things industry is still mainly in the “concept” stage, and the number of practical products compared with other fields is very different. As an application of Internet of Things technology, this article designs a door lock system based on Android mobile phone software certification, discusses the system’s composition and working process, and analyzes the design scheme of the system. This system uses a mobile phone as a “key” to control the door lock. The mobile device that has obtained the unlocking key can open the door lock by sending an unlocking control command after passing the authentication.
IoT device applications
Connected devices are part of a scenario where each device talks to other related devices in the environment to automate household and industrial tasks and communicate available sensory data to the user, the individual, the enterprise, or other interested parties. IoT devices are designed to work with people in homes, industries, or businesses. Therefore, devices can be divided into three broad categories: consumer, enterprise, and industrial.
Consumer connected devices include smart TVs, smart speakers, toys, wearables and smart appliances.
Smart meters are commercial security systems and smart city technologies. Technologies used to monitor traffic and weather conditions are examples of industrial and enterprise IoT devices. Other technologies, including smart air conditioners, smart thermostats, smart lighting and smart security technology, cover home, business and industrial uses.
In a smart home, an individual arrives at home and his car communicates with the garage to open the door. Once inside, the thermostat had been adjusted to his preferred temperature and the lights were set to a lower intensity and he chose colors that were relaxing since his pacemaker data suggested it was a stressful day .
In enterprises, smart sensors located in meeting rooms can help employees find and schedule available rooms for meetings, ensuring that the right room type, size and functionality are available. As attendees enter the room, the temperature will adjust based on occupancy and the lights will dim as the appropriate PowerPoint loads on the screen and the speaker begins their presentation.
On the factory floor, assembly line machines outfitted with sensors will provide sensor data to a factory operator, informing her of anomalies and predicting when parts need to be replaced. Such information can prevent unplanned downtime and loss of productivity and profits.
In the field, such notifications can alert the user to what’s wrong and what part is needed to fix it, avoiding the need to dispatch a field service person to diagnose the problem, only to waste her time driving to a warehouse, finding the correct part and returning on site.
IoT device management
Many challenges can hinder the successful deployment of IoT systems and their connected devices, including security, interoperability, power/processing capabilities, scalability, and availability. IoT device management can solve many of these problems by adopting standard protocols or using services provided by vendors.
Device management helps companies integrate, organize, monitor and remotely manage Internet-enabled devices at scale and provides capabilities critical to maintaining the health, connectivity and security of IoT devices throughout their lifecycle. These features include:
Device registration
Device authentication/authorization
Device Configuration
Device Configuration
Device monitoring and diagnostics
Equipment troubleshooting
Available standardized device management protocols include Open Mobile Alliance Device Management (OMA DM) and Lightweight Machine-to-Machine (OMA LwM2M).
IoT device connectivity and networking
The networking, communication, and connection protocols used by Internet-enabled devices largely depend on the specific IoT application being deployed. As with many different IoT applications, there are many different connectivity and communication options.
Communication protocols include CoAP, DTLS, MQTT, etc. Wireless protocols include IPv6, LPWAN, Zigbee, Bluetooth Low Energy, RFID and NFC. 2/3/4G (DTU and industrial routers), NB-IoT, Wi-Fi and Ethernet are also available.
Each option has its trade-offs in terms of power consumption, range, and bandwidth, all of which must be considered when selecting connected devices and protocols for a specific IoT application.
To share the sensor data they collect, IoT devices connect to an IoT gateway or another edge device, where the data can be analyzed locally or sent to the cloud for analysis.
With the development of unlocking technology, the security of traditional door locks has been challenged. More importantly, the cumbersome operation of manual unlocking has gradually become the main reason why users cannot accept traditional door locks. The goal of this article is to improve the door lock system. The problem is to propose a design scheme for controlling the door lock through a mobile device such as a mobile phone.
Keywords: 4g dtu
English 
Russian 
German 
Spanish 
Italian 
Portuguese 
French 
Dutch