CN113269909A - Intelligent lock data management system based on Bluetooth communication - Google Patents
Intelligent lock data management system based on Bluetooth communication Download PDFInfo
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- 238000013523 data management Methods 0.000 title claims abstract description 24
- 238000012795 verification Methods 0.000 claims abstract description 35
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- 238000012545 processing Methods 0.000 claims description 9
- 230000004044 response Effects 0.000 claims description 8
- 238000013475 authorization Methods 0.000 claims description 7
- 230000003993 interaction Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 claims description 5
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00563—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys using personal physical data of the operator, e.g. finger prints, retinal images, voicepatterns
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00571—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by interacting with a central unit
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00817—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys where the code of the lock can be programmed
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- G—PHYSICS
- G07—CHECKING-DEVICES
- G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
- G07C9/00—Individual registration on entry or exit
- G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
- G07C9/00896—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys specially adapted for particular uses
Abstract
The invention relates to an intelligent lock data management system based on Bluetooth communication, which comprises an intelligent lock, a mobile terminal and a cloud server, wherein the intelligent lock is connected with the mobile terminal through a network; the intelligent lock comprises a wireless communication module and a mechanical lock body, and is used for receiving and verifying data exchange of the mobile terminal, completing verification and controlling the mechanical lock body to carry out unlocking operation after the verification is completed; the mobile terminal is used for exchanging data with the intelligent lock and the cloud server and completing verification; the cloud server stores intelligent lock Bluetooth address data and user identity identification data, is used for responding to a data request of the mobile terminal and sending the intelligent lock Bluetooth address data and the user identity identification data to the mobile terminal, and achieves the effects of preventing illegal access and improving communication efficiency.
Description
Technical Field
The invention belongs to the field of locks, and particularly relates to the field of intelligent locks.
Background
With the rapid development of the internet of things technology, smart home products have been popularized in daily life of people, and smart locks are one of indispensable in smart home products, and the security requirements of people are higher and higher, so that smart lock products are rapidly developed. Most intelligent locks in the market only support wireless short-distance communication, so that data monitoring and system optimization of the intelligent locks by a cloud server are prevented.
In recent two years, along with the more mature NB-IoT technology, the NB-IoT technology has gradually gained market acceptance due to the advantages of long-distance communication, low cost, low power consumption and the like. The NB-IoT technology is applied to the field of intelligent locks, the traditional intelligent lock equipment is accessed into the NB-IoT network, the advantages of large coverage, large connection amount, low power consumption and higher data transmission speed compared with the traditional intelligent lock are realized, and the NB-IoT intelligent lock is more convenient and stable compared with the traditional intelligent lock. On one hand, the existing NB-IoT intelligent lock has defects in connection safety and is difficult to prevent illegal access; on the other hand, in an actual application scenario, the intelligent lock which only utilizes the NB-IoT technology for communication adopts the intelligent lock to directly communicate with the cloud server, so that the problems of poor signal and low NB-IoT communication rate caused by geographical location in part of places often exist, direct communication between the intelligent lock and the cloud server becomes difficult, and sometimes, the untimely data communication exists, and poor experience is brought to users who use the intelligent lock in reality.
Disclosure of Invention
In view of the problems that the security of the intelligent lock in the prior art is insufficient, illegal access is difficult to prevent, and the communication efficiency is low when NB-IoT communication signals are poor, the invention provides an intelligent lock data management system based on Bluetooth communication.
In order to solve the problem that when NB-IoT communication signals are not good in the prior art, direct communication with a cloud server becomes poor, the technical scheme of the invention is as follows: an intelligent lock data management system based on Bluetooth communication comprises an intelligent lock and a cloud server; the intelligent lock comprises a wireless communication module and a mechanical lock body, and is used for receiving and verifying data requests and controlling the mechanical lock body to carry out unlocking operation after verification is finished; the cloud server stores intelligent lock address data and user identity identification data, is used for responding to a data request and sends the intelligent lock address data and the user identity identification data; the intelligent lock is connected with the cloud server through the mobile terminal, and the mobile terminal is used for performing data interaction on the intelligent lock and/or the cloud server; the intelligent lock wireless communication module is characterized by comprising an NB-IoT communication unit and a Bluetooth communication unit, wherein the Bluetooth communication unit is used for establishing a first connection with the mobile terminal, and the NB-IoT communication unit is used for establishing a second connection with the cloud server; the intelligent lock address data stored by the cloud server is Bluetooth address data. According to the invention, the mobile terminal is used as an intermediate bridge, and the problems that NB-IoT signals are poor and communication between the intelligent lock and the cloud server becomes difficult when NB-IoT communication rate is low due to geographical positions and the like can be effectively avoided through the first connection between the mobile terminal and the intelligent lock and the connection between the mobile terminal and the cloud server. At this time, the cloud server is used for responding to a data request of the mobile terminal and sending the intelligent lock Bluetooth address data and the user identification data to the mobile terminal; the intelligent lock is used for receiving and verifying the data request of the mobile terminal and controlling the mechanical lock body to carry out related operations such as unlocking and the like after verification is completed. The Bluetooth communication unit comprises a connection timeout processing subunit, a data writing timeout processing subunit and/or a data rewriting subunit, and can further ensure data transmission between the first connections.
In order to ensure the security of the intelligent lock, the method for establishing the first connection between the intelligent lock and the mobile terminal comprises the following steps: the intelligent lock receives a connection request sent by the mobile terminal and sends first verification data comprising a frame header, a random code and a check bit to the mobile terminal, the mobile terminal sends second verification data comprising the frame header, XOR data, a state code and the check bit to the intelligent lock after receiving the first verification data, the intelligent lock sends third verification data comprising the frame header, a response code and the check bit after receiving the second verification data to complete verification, wherein the XOR data is obtained by carrying out XOR operation on the random code and a lock password, and the response code comprises information whether the verification passes or not. If the response code contains the verification information, the connection is established between the intelligent lock and the mobile terminal, and the next information interaction can be carried out between the intelligent lock and the mobile terminal. In order to ensure the security of the intelligent lock, the connection mode of the cloud server and the mobile terminal can also be established through the method, and the specific text description only needs to replace the intelligent lock with the cloud server; similarly, the direct connection between the smart lock and the cloud server, i.e. the second connection, may also be a secure connection established by the above method, and only the "mobile terminal" needs to be replaced by the "cloud server". Therefore, in the intelligent lock data management system in the prior art, the connection between the intelligent lock and the cloud server can also be realized through the method, so that the safety is improved. The intelligent lock data management system also comprises a user authorization module, a data synchronization module and a system upgrading module, wherein the user authorization module comprises a user login unit and a data request and sending unit; the user login unit is used for logging in the intelligent lock data management system at the mobile terminal; after the user login is completed, the data request and sending unit scans the equipment identification code of the intelligent lock through the mobile terminal, requests the user identification data of the current login user from the cloud server and sends the user identification data to the intelligent lock, and therefore user authorization is completed.
After the connection between the intelligent lock and the mobile terminal and the connection between the mobile terminal and the cloud server are successfully connected through the connection method for guaranteeing the safety, the data synchronization module is used for requesting and receiving the Bluetooth address data of the intelligent lock and the user identity identification data from the cloud server after the mobile terminal scans the equipment identification code of the intelligent lock; and the mobile terminal writes the user identification data into the intelligent lock in a Bluetooth communication mode according to the intelligent lock Bluetooth address data to complete data synchronization.
After the connection method for ensuring the safety of the invention is used for successfully connecting the intelligent lock with the mobile terminal and connecting the mobile terminal with the cloud server, the system upgrading module is used for requesting the Bluetooth address data and the system version information of the intelligent lock from the cloud server when the mobile terminal scans the equipment identification code of the intelligent lock, if the version information is an updated version, downloading the updated version file from the cloud server, writing the updated version file into the intelligent lock by the mobile terminal in a Bluetooth communication mode according to the Bluetooth address data of the intelligent lock, restarting the intelligent lock after the writing is finished, and informing the cloud server.
The equipment identification code is a two-dimensional code, and the user identification data comprises fingerprint data, password data and/or IC card data of a user; the intelligent lock further comprises a fingerprint management module, a password management module, an IC card management module and a digital key management module.
According to the Bluetooth communication module, on one hand, data interaction is carried out through Bluetooth communication when NB-IoT signals are poor and communication speed is low, and the problems that communication is difficult and data communication is not timely due to the NB-IoT signal problem are solved. Meanwhile, the security of the intelligent lock is enhanced through the verification process when the mobile terminal and the intelligent lock device are connected.
Drawings
Fig. 1 is a schematic diagram of an overall architecture of an intelligent lock data management system based on bluetooth communication according to an embodiment of the present application;
FIG. 2 is a schematic diagram of an architecture of an intelligent lock provided in an embodiment of the present application;
fig. 3 is a flowchart of a data synchronization operation provided by an embodiment of the present application.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to specific examples, and it is apparent that the described examples are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person skilled in the art without inventive step are within the scope of protection of the present invention.
The action execution main body of each module and step in the intelligent lock data management system based on the Bluetooth communication provided by the embodiment of the invention can be a computer system based on the intelligent lock data management based on the Bluetooth communication provided by the invention; each functional module of the system can be arranged in a mobile terminal, a computer, a server or other intelligent terminals and the like; the mobile terminal can be an intelligent mobile device such as a mobile phone and a tablet personal computer.
In an embodiment provided by the invention, referring to fig. 1, an intelligent lock data management system based on bluetooth communication includes an intelligent lock, a mobile terminal and a cloud server; the cloud server serves as a system background and is used for storing user identification data, in a preferred embodiment, the user identification data can be user fingerprint data, digital password data and/or operation record data, mainly comprises related information such as unique ID, name, time, role authority and limited period, can also be other data considered by other users as other needed data, and also serves as a direct command sending channel of the intelligent lock and the mobile terminal, and the intelligent lock can communicate with the cloud server through NB-IoT communication technology. NB-IoT (Narrow Band Internet of Things, NB-IoT) is also called narrowband Internet of Things technology, is built in a cellular network, consumes less bandwidth, can be directly deployed in a GSM network, a UMTS network, or an LTE network, has a wider coverage area and lower power consumption compared to other existing wireless communication technologies, and is widely used in smart devices. As shown in fig. 2, the smart lock includes a wireless communication module, a fingerprint management module, a password management module, an IC card management module, a digital key management module, and a mechanical lock body, and the wireless communication module includes an NB-IoT communication unit and a bluetooth communication unit. According to the embodiment, when NB-IoT signals are good, a mobile terminal is connected with a cloud server to complete user login, then the mobile terminal is connected with an intelligent lock through scanning a two-dimensional code of the intelligent lock, the intelligent lock is connected with the cloud server through an NB-IoT communication unit, the cloud server logs in user identification data which correspond to a user and comprise user fingerprint data, password data and IC card data to the intelligent lock, and after verification is successful, a mechanical lock body is controlled to be unlocked. In another embodiment, when the smart lock is in an environment with poor NB-IoT signals, at this time, because the NB-IoT signals are poor, it is difficult for the smart lock to establish direct connection with the cloud server through the NB-IoT communication unit, or even if connection is established, problems such as communication delay, data transmission or reception failure, and the like are caused by poor signals, in this embodiment, data request and reception are performed through the mobile terminal and the cloud server, and the mobile terminal performs data interaction through the bluetooth communication unit of the smart lock, and the specific process is as follows: the mobile terminal is connected with a cloud server for user login, and user identification data comprising fingerprint data, password data and IC card data of a user and Bluetooth address data of the intelligent lock are stored in the cloud server. The mobile terminal scans the two-dimensional code of the intelligent lock after the user logs in, after the mobile terminal scans the two-dimensional code of the intelligent lock, the mobile terminal requests and receives Bluetooth address data of the intelligent lock and user identity identification data comprising fingerprint data, password data and IC card data of the user from the cloud server, after the data are received, the mobile terminal carries out Bluetooth communication with the intelligent lock according to the received Bluetooth address data of the intelligent lock, and the mechanical lock body is controlled to be unlocked after safety verification is completed. In a preferred embodiment, the data management system further comprises a user authorization module, a data synchronization module and a system upgrading module, wherein the user authorization module comprises a user login unit and a data request and sending unit; the user login unit is used for logging in the data management system at the mobile terminal; after the user logs in, the data requesting and sending unit scans an equipment identification code of the intelligent lock through the mobile terminal, preferably the equipment identification code is a two-dimensional code, requests user identification data including fingerprint data, password data and IC card data of the user currently logging in to the intelligent lock from the cloud server, and sends the user identification data to the intelligent lock. Preferably, the mobile terminal and the intelligent lock are connected and then data transmission is carried out through Bluetooth. The Bluetooth communication unit comprises a connection overtime processing subunit, a write data overtime processing subunit and a data rewriting subunit; the connection timeout processing subunit is used for setting a timeout duration range of the bluetooth connection, preferably to 10 seconds; the data writing timeout processing subunit is configured to set a bluetooth data writing timeout duration, which is preferably set to 3 seconds; the data rewriting processing subunit is configured to set the number of data rewrites, preferably to 3. The mobile terminal needs to perform security verification when being connected with the intelligent lock, the intelligent lock finds that the intelligent lock is connected after the mobile terminal initiates connection, namely, the mobile terminal is verified by sending a random code, the mobile terminal must show the identity of the mobile terminal in a set time, all authority operation can be performed after successful verification, otherwise, the mobile terminal is identified as an illegal person, and the intelligent lock actively disconnects the connection. To ensure that the device is not occupied by illegal connection. Specifically, after the connection is initiated, the smart lock sends:
the mobile terminal must respond by:
in response, the smart lock sends:
the intelligent lock receives the random code and the lock body password, and the lock body password can be taken out by the intelligent lock after the intelligent lock receives the random code and the random code sent by the intelligent lock, so that whether the intelligent lock can log in or not can be verified. A password error will return an error code and disconnect it. In addition, the lock password is generally factory-used and unified, a user can log in through the mobile phone by using a default password and then modify the password, the modified password is recorded by the mobile phone, and the user can directly log in through a new password next time. In a preferred embodiment, the smart lock may send 5 times of random codes each with an interval of 300ms to detect the mobile terminal, and if the mobile terminal responds incorrectly or does not respond, the smart lock is triggered to actively disconnect, so as to prevent malicious connection occupation. In addition, the data is encrypted in an AES128 mode in the data receiving and sending processes so as to prevent the data from being monitored, and the problem of simulating the data is avoided because the data are random each time. The status code in the mobile terminal response message is used for indicating that the current user is unlocking or operating other functions. If the password is unlocked, the unlocking function can be directly executed after the response password is correct. If the operation is other operation, the step is to keep the connection function only after the login authentication is successful, and then to execute other operation by sending a command subsequently. The process not only solves the safety problem, but also ensures the unlocking speed.
FIG. 3 illustrates a data synchronization flow in a preferred embodiment. As shown in fig. 3, a user logs in the system through a mobile terminal, and after the system login is completed, the device identification code of the smart lock is scanned, and preferably, the device identification code is a two-dimensional code. After the mobile terminal scans the equipment identification code of the intelligent lock, the mobile terminal requests and receives the Bluetooth address data of the intelligent lock and the user identification data comprising the fingerprint data, the password data and the IC card data of the user from the cloud server, and after the data are received, the mobile terminal writes the fingerprint data, the password data and the IC card data of the user into the intelligent lock in a Bluetooth communication mode according to the received Bluetooth address data of the intelligent lock, completes data synchronization and informs the cloud server.
In one embodiment, the system further supports the upgrade function realized through a system upgrade module, when the mobile terminal scans the two-dimensional code of the intelligent lock, the mobile terminal requests the cloud server for intelligent lock Bluetooth address data and system version information, if the version information is an updated version, the updated version file is downloaded to the cloud server, the mobile terminal writes the updated version file into the intelligent lock in a Bluetooth communication mode according to the intelligent lock Bluetooth address data, and restarts the intelligent lock and informs the cloud server after the writing is completed.
The present invention further provides an embodiment, which includes a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the computer program implements the communication interaction between each module function and each execution subject in the bluetooth communication-based intelligent lock data management system as described in any of the above embodiments. Computer-readable storage media to which the invention relates include Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
It should also be noted that when referring to the present invention, such terms as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. The utility model provides an intelligence lock data management system based on bluetooth communication, includes intelligence lock, cloud ware and mobile terminal:
the intelligent lock comprises a wireless communication module and a mechanical lock body, wherein the wireless communication module receives and verifies a data request and controls the mechanical lock body to unlock after verification is completed;
the cloud server stores intelligent lock address data and user identity identification data to respond to a data request and sends the intelligent lock address data and the user identity identification data;
the mobile terminal is connected with the intelligent lock and/or the cloud server to perform data interaction;
the intelligent lock is characterized in that the intelligent lock address data is Bluetooth address data; the wireless communication module comprises an NB-IoT communication unit and a Bluetooth communication unit; the Bluetooth communication unit is used for establishing a first connection with the mobile terminal, and the NB-IoT communication unit is used for establishing a second connection with the cloud server;
establishing the first connection comprises: the intelligent lock receives a connection request of the mobile terminal and sends first verification data to the mobile terminal; the mobile terminal sends second verification data to the intelligent lock after receiving the first verification data, and the intelligent lock sends third verification data to the mobile terminal after receiving the second verification data to complete verification;
establishing the connection between the mobile terminal and the cloud server comprises: the cloud server receives a connection request sent by the mobile terminal, sends first verification data to the mobile terminal, the mobile terminal sends second verification data to the cloud server after receiving the first verification data, and the cloud server sends third verification data to the mobile terminal after receiving the second verification data to complete verification;
the first verification data comprises a frame header, a random code and a check bit;
the second verification data comprises a frame header, exclusive-or data, a state code and a check bit; the XOR data is obtained by carrying out XOR operation on the random code and the lock password;
the third verification data comprises a frame header, a response code and a check bit, wherein the response code comprises information whether the verification is passed or not.
2. The data management system of claim 1, wherein the bluetooth communication unit comprises a connection timeout processing subunit, a write data timeout processing subunit, and/or a data rewriting subunit.
3. The data management system of claim 1, further comprising a user authorization module, the user authorization module comprising a user login unit, a data request and transmission unit; the user login unit is used for the mobile terminal to log in the data management system; after the user login is completed, the data request and sending unit scans the equipment identification code of the intelligent lock through the mobile terminal, requests the cloud server for the user identification data of the current login user and sends the user identification data to the intelligent lock.
4. The data management system of claim 3, further comprising a data synchronization module, wherein the data synchronization module is configured to request and receive the smart lock bluetooth address data and the user identification data from the cloud server after the mobile terminal scans the device identification code of the smart lock; and the mobile terminal writes the user identification data into the intelligent lock in a Bluetooth communication mode according to the intelligent lock Bluetooth address data.
5. The data management system of claim 4, further comprising a system upgrade module, wherein the system upgrade module is configured to request the smart lock bluetooth address data and the system version information from the cloud server when the mobile terminal scans the device identification code of the smart lock, download the updated version file from the cloud server if the version information is an updated version, write the updated version file into the smart lock by the mobile terminal in a bluetooth communication manner according to the smart lock bluetooth address data, and restart the smart lock and notify the cloud server after the write is completed.
6. The data management system according to claim 5 or 4, wherein the device identification code is a two-dimensional code.
7. The data management system of claim 6, wherein the user identification data includes fingerprint data, password data, and IC card data of the user.
8. The data management system of claim 7, wherein the smart lock further comprises a fingerprint management module, a password management module, an IC card management module, and a digital key management module.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113810891A (en) * | 2021-09-18 | 2021-12-17 | 深圳市芯中芯科技有限公司 | Lightweight data interaction method and system based on Internet of things and Bluetooth technology |
| CN114205818A (en) * | 2021-12-06 | 2022-03-18 | 广东好太太智能家居有限公司 | User binding method and system of NB-IoT intelligent lock |
| US11941389B1 (en) | 2023-10-12 | 2024-03-26 | Lockmasters, Inc. | Systems and methods for providing customized firmware packages to a locking device |
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