CN113660651A - Method for assisting electrical appliance to configure wifi parameter based on NFC technology - Google Patents
Method for assisting electrical appliance to configure wifi parameter based on NFC technology Download PDFInfo
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- CN113660651A CN113660651A CN202110969993.3A CN202110969993A CN113660651A CN 113660651 A CN113660651 A CN 113660651A CN 202110969993 A CN202110969993 A CN 202110969993A CN 113660651 A CN113660651 A CN 113660651A
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- 239000002184 metal Substances 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 9
- 230000005540 biological transmission Effects 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
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- H04B5/72—
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/08—Configuration management of networks or network elements
- H04L41/0889—Techniques to speed-up the configuration process
Abstract
The invention discloses a method for configuring wifi parameters of an auxiliary electrical appliance based on an NFC technology, and particularly relates to the technical field of NFC. And secondly, the NFC works at the frequency of 13.56Mhz, and the anti-interference capability is strong. A simple NFC circuit can be formed by adding a small part of peripheral circuits to one coil antenna. The NFC technology thoroughly solves the problem of safe communication of near field communication on a link layer, can effectively prevent attacks such as counterfeiting, eavesdropping, tampering and the like, can be widely applied to various products such as non-contact cards, NFC equipment, mobile payment and the like, and enables users to be safer and more relieved when using NFC services.
Description
Technical Field
The invention particularly relates to the technical field of NFC, and particularly relates to a method for assisting an electric appliance to configure wifi parameters based on the NFC technology.
Background
The distribution network flow depends on the information required to be transmitted by the distribution network, so various schemes and technologies are brought forth. No matter the WiFi device, the bluetooth BLE device, the 3/4G device, or the Zigbee device, the premise of realizing the device networking intelligence is that hardware can be directly or indirectly (through a mobile phone) connected to the Internet network and added to the user account. Then, the device can report data to the cloud and receive instructions from the cloud.
For devices with screen input, such as mobile phones, tablets and the like, a user can directly input SSID and PASSWORD through an interface to connect the device to a WiFi network. For the non-screen devices such as sockets and bulbs, users cannot input internet information to enable the devices to be connected to the network, and at this time, the devices need to be subjected to network distribution operation. The distribution network aiming at the WiFi type equipment is a process of transmitting the WiFi SSID and the PASSSWORD of the router to the terminal equipment in a certain mode and enabling the terminal equipment to be capable of accessing the WiFi network. Two common distribution network modes and principle methods are briefly introduced here.
One, two traditional WiFi network distribution schemes
1) SmartConfig (broadcasting distribution network)
SmartConfig is a scheme that a mobile phone sends internet surfing information (target router parameters) through broadcasting, and equipment acquires the information in a monitoring mode and then connects to the internet. According to the scheme, the user needs to input the name and the password of the WiFi, and the distribution network operation can be completed by clicking to start the distribution network. If the network is interfered greatly or the signal is weak, the data is easy to lose, the difficulty of the distribution network is increased, the period is long, and the success rate of the distribution network is low.
2) SoftAP (hotspot distribution network)
When the network is distributed in the SoftAP mode, the equipment is in the AP mode, the mobile phone is directly connected with the equipment, parameters of a target router are transmitted, the problem of terminal compatibility (2.4G or 5G WiFi) is not considered, and the equipment end only needs to capture wireless data packets as long as a mobile phone software end continuously sends the wireless data packets to the air. However, the mode of a wireless data frame distribution network is extremely unstable, the distribution network success rate is low, and the influence of the environment, the mobile phone model and the router model is large.
Second, the problem that two traditional WiFi distribution networks are exposed
1) Need for hardware support
When the SmartConfig is in a distribution network, the mobile phone APP packs corresponding information into a specific area of an 802.11 data packet and sends the information to the surrounding environment; and the wifi module of the intelligent equipment is in a promiscuous mode, and monitors all messages in the network until the required information is analyzed. And when the SoftAP is in a network distribution, the wifi module of the intelligent device is switched to the AP mode, the mobile phone is used as the STA to be connected with the AP of the intelligent device, and then the mobile phone and the intelligent device are connected with each other through establishing a Socket to exchange data. It can be seen that both require wifi hardware support. The SoftAP mode requires hardware to support the AP mode, the SmartConfig configuration mode requires hardware to support the promiscuous mode, and some wifi chip manufacturers turn off the promiscuous mode for power saving.
2) Performance limitation
At present, most of household routers are set to be in a high-speed routing mode, the UDP broadcast packet rate sent by a mobile phone is high, and due to performance limitation, a wifi module of an intelligent device may not capture complete information in processing speed, so that SmartConfig distribution network failure is caused.
3) Same frequency interference
A general router transmits a wifi environment in a 2.4Ghz band, which has only 13 channels available in china, and a wireless network used by most of us operates in the 2.4Ghz band. Meanwhile, a wireless keyboard and mouse, a wireless earphone, a Bluetooth device and the like are operated in the 2.4GHz frequency band, so that the situation that the frequency band is very crowded is caused. Therefore, the co-frequency radio signal interference of 2.4Gwifi cannot be avoided. This also has the chance of causing a network distribution failure.
4) Security
The SmartConfig distribution network and the SoftAP distribution network both adopt a wireless local area network data transmission mode, so that messages transmitted in the air can be easily monitored by using a tool.
Disclosure of Invention
The invention aims to provide a method for assisting an electric appliance to configure wifi parameters based on an NFC technology, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for assisting an electric appliance to configure wifi parameters based on an NFC technology comprises the following steps:
the first step is as follows: designing hardware;
the second step is that: designing an antenna;
the third step: designing software;
the fourth step: connection of a router;
the first step is as follows: due to the design of hardware, compared with the traditional distribution network mode, the distribution network time is shorter, the success rate is higher, and the data transmission is safer by using the NFC near field communication technology to assist an electric appliance to complete the distribution network of the equipment; the NFC communication chip adopts FM11NT081D developed by the compound denier microelectronics company, conforms to the ISO/IEC 14443-A protocol and the NFCForumType2Tag standard, and is a double-interface NFC Tag chip with an I2C or SPI interface, the total capacity of the EEPROM is 924bytes, and the NFC Tag chip is divided into 231 pages (pages) and 4bytes per Page; because the function of the FM11NT081D chip is completely compatible with the technical requirement of NFCForumType2Tag, the initialization of NDEF format data is well done when the chip leaves a factory, and the chip can start 32-bit passwords for protecting the reading and writing of a storage area;
the second step is as follows: the design of the antenna is characterized in that a coil induces a magnetic field emitted by a mobile phone or a card reader by utilizing LC resonance and inductive coupling modes to generate current through the coil so as to provide energy required by the work of a chip, so that large-area metal or copper can not be arranged inside and outside the coil and right above or right below the coil, otherwise, a radio frequency field sent by the mobile phone is shielded, the card reading distance is attenuated, large-area metal is arranged below the coil, and a wave absorbing material is required to be attached between the antenna and the metal;
the third step is as follows: designing software, entering a configuration mode after receiving a configuration network access command, and waiting for receiving the ssid and the pwd; if the ssid and the pwd are successfully obtained, automatically connecting the router; if the obtained ssid and pwd are used to successfully connect the route, a configuration success packet is sent (possibly restarted); if the obtained ssid/pwd exits overtime, connecting the routing hotspot successfully connected last time;
the fourth step is as follows: the method comprises the steps of connecting a router, caching a routing hotspot which is successfully connected last time, not considering whether the connection of an external network is successful, using a current ssid and a current pwd to connect the router, retrying immediately after the router fails, if the retrying exceeds 30S, the router hotspot which is successfully connected last time is tried to be connected last time (the current hotspot is different from the hotspot which is successfully connected last time), if the router is still failed, alternately trying to connect the current hotspot and the hotspot which is successfully connected last time, if the connection route exceeds 2 minutes, and if the connection route is still failed, restarting a module in an STA mode, restarting the last step, successfully connecting, and updating the current ssid/pwd and the ssid/pwd which is successfully connected.
As a further technical solution of the present invention, the second step: when the antenna coil is actually designed, the antenna is mainly influenced by the following points: coil area, coil inductance, coil Q-value, coil impedance. When the antenna is designed, the effective area of the antenna is designed to be maximized (50mm x 50mm is optimal), and the inductance value of the antenna is suitable to be between 800nH and 1.5 uH. The internal self capacitance C of the chip is 50pF, the resonant frequency can be compensated through the external matching capacitance C, and the calculation formula of the resonant frequency is
L is approximately the coil inductance and C is approximately equal to the chip internal capacitance + the external matching capacitance.
As a further technical solution of the present invention, the second step: according to the design of the antenna, after the inductance of the coil is determined, the relation between the Q value of the coil and the impedance R of the antenna is large, the wire diameter of the coil is thick and the impedance is small when the inductance reaches, the wire width of the coil is suggested to be larger, the Q value is larger, and the calculation formula of the Q value is as follows:
Q＝2*π*f*L/R)。
compared with the prior art, the invention has the beneficial effects that:
the method for configuring the wifi parameter by the aid of the electric appliance based on the NFC technology is a process of enabling the terminal device to be connected to the network, excellent distribution network experience is the first step of product user activation, the distribution network step can be completed by touching the mobile phone, and the method is simple and not complicated. And secondly, the NFC works at the frequency of 13.56Mhz, and the anti-interference capability is strong. A simple NFC circuit can be formed by adding a small part of peripheral circuits to one coil antenna. The NFC technology thoroughly solves the problem of safe communication of near field communication on a link layer, can effectively prevent attacks such as counterfeiting, eavesdropping, tampering and the like, can be widely applied to various products such as non-contact cards, NFC equipment, mobile payment and the like, and enables users to be safer and more relieved when using NFC services. Therefore, the NFC near field communication technology is used for assisting the electric appliance to complete the equipment distribution network, and compared with the traditional distribution network mode, the distribution network time is shorter, the success rate is higher, and the data transmission is safer.
Drawings
FIG. 1 is a timing diagram of the system of the present invention;
FIG. 2 is a flow chart of the software design of the present invention;
fig. 3 is a flow chart of router connection according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the embodiment of the invention, a method for assisting an electric appliance to configure wifi parameters based on an NFC technology comprises the following steps:
the first step is as follows: designing hardware;
the second step is that: designing an antenna;
the third step: designing software;
the fourth step: connection of a router;
the first step is as follows: due to the design of hardware, compared with the traditional distribution network mode, the distribution network time is shorter, the success rate is higher, and the data transmission is safer by using the NFC near field communication technology to assist an electric appliance to complete the distribution network of the equipment; the NFC communication chip adopts FM11NT081D developed by the compound denier microelectronics company, conforms to the ISO/IEC 14443-A protocol and the NFCForumType2Tag standard, and is a double-interface NFC Tag chip with an I2C or SPI interface, the total capacity of the EEPROM is 924bytes, and the NFC Tag chip is divided into 231 pages (pages) and 4bytes per Page; because the function of the FM11NT081D chip is completely compatible with the technical requirement of NFCForumType2Tag, the initialization of NDEF format data is well done when the chip leaves a factory, and the chip can start 32-bit passwords for protecting the reading and writing of a storage area;
the second step is as follows: the design of the antenna is characterized in that a coil induces a magnetic field emitted by a mobile phone or a card reader by utilizing LC resonance and inductive coupling modes to generate current through the coil so as to provide energy required by the work of a chip, so that large-area metal or copper can not be arranged inside and outside the coil and right above or right below the coil, otherwise, a radio frequency field sent by the mobile phone is shielded, the card reading distance is attenuated, large-area metal is arranged below the coil, and a wave absorbing material is required to be attached between the antenna and the metal;
the third step is as follows: designing software, entering a configuration mode after receiving a configuration network access command, and waiting for receiving the ssid and the pwd; if the ssid and the pwd are successfully obtained, automatically connecting the router; if the obtained ssid and pwd are used to successfully connect the route, a configuration success packet is sent (possibly restarted); if the obtained ssid/pwd exits overtime, connecting the routing hotspot successfully connected last time;
the fourth step is as follows: the method comprises the steps of connecting a router, caching a routing hotspot which is successfully connected last time, not considering whether the connection of an external network is successful, using a current ssid and a current pwd to connect the router, retrying immediately after the router fails, if the retrying exceeds 30S, the router hotspot which is successfully connected last time is tried to be connected last time (the current hotspot is different from the hotspot which is successfully connected last time), if the router is still failed, alternately trying to connect the current hotspot and the hotspot which is successfully connected last time, if the connection route exceeds 2 minutes, and if the connection route is still failed, restarting a module in an STA mode, restarting the last step, successfully connecting, and updating the current ssid/pwd and the ssid/pwd which is successfully connected.
As a further technical solution of the present invention, the second step: when the antenna coil is actually designed, the antenna is mainly influenced by the following points: coil area, coil inductance, coil Q-value, coil impedance. When the antenna is designed, the effective area of the antenna is designed to be maximized (50mm x 50mm is optimal), and the inductance value of the antenna is suitable to be between 800nH and 1.5 uH. The internal self capacitance C of the chip is 50pF, the resonant frequency can be compensated through the external matching capacitance C, and the calculation formula of the resonant frequency is
L is approximately the coil inductance and C is approximately equal to the chip internal capacitance + the external matching capacitance.
As a further technical solution of the present invention, the second step: according to the design of the antenna, after the inductance of the coil is determined, the relation between the Q value of the coil and the impedance R of the antenna is large, the wire diameter of the coil is thick and the impedance is small when the inductance reaches, the wire width of the coil is suggested to be larger, the Q value is larger, and the calculation formula of the Q value is as follows:
Q＝2*π*f*L/R)。
it will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (3)
1. A method for assisting an electric appliance to configure wifi parameters based on an NFC technology is characterized in that: the method comprises the following steps:
the first step is as follows: designing hardware;
the second step is that: designing an antenna;
the third step: designing software;
the fourth step: connection of a router;
the first step is as follows: due to the design of hardware, compared with the traditional distribution network mode, the distribution network time is shorter, the success rate is higher, and the data transmission is safer by using the NFC near field communication technology to assist an electric appliance to complete the distribution network of the equipment; the NFC communication chip adopts FM11NT081D developed by the compound denier microelectronics company, conforms to the ISO/IEC 14443-A protocol and the NFCForumType2Tag standard, and is a double-interface NFC Tag chip with an I2C or SPI interface, the total capacity of the EEPROM is 924bytes, and the NFC Tag chip is divided into 231 pages (pages) and 4bytes per Page; because the function of the FM11NT081D chip is completely compatible with the technical requirement of NFCForumType2Tag, the initialization of NDEF format data is well done when the chip leaves a factory, and the chip can start 32-bit passwords for protecting the reading and writing of a storage area;
the second step is as follows: the design of the antenna is characterized in that a coil induces a magnetic field emitted by a mobile phone or a card reader by utilizing LC resonance and inductive coupling modes to generate current through the coil so as to provide energy required by the work of a chip, so that large-area metal or copper can not be arranged inside and outside the coil and right above or right below the coil, otherwise, a radio frequency field sent by the mobile phone is shielded, the card reading distance is attenuated, large-area metal is arranged below the coil, and a wave absorbing material is required to be attached between the antenna and the metal;
the third step is as follows: designing software, entering a configuration mode after receiving a configuration network access command, and waiting for receiving the ssid and the pwd; if the ssid and the pwd are successfully obtained, automatically connecting the router; if the obtained ssid and pwd are used to successfully connect the route, a configuration success packet is sent (possibly restarted); if the obtained ssid/pwd exits overtime, connecting the routing hotspot successfully connected last time;
the fourth step is as follows: the method comprises the steps of connecting a router, caching a routing hotspot which is successfully connected last time, not considering whether the connection of an external network is successful, using a current ssid and a current pwd to connect the router, retrying immediately after the router fails, if the retrying exceeds 30S, the router hotspot which is successfully connected last time is tried to be connected last time (the current hotspot is different from the hotspot which is successfully connected last time), if the router is still failed, alternately trying to connect the current hotspot and the hotspot which is successfully connected last time, if the connection route exceeds 2 minutes, and if the connection route is still failed, restarting a module in an STA mode, restarting the last step, successfully connecting, and updating the current ssid/pwd and the ssid/pwd which is successfully connected.
2. The method for configuring wifi parameters of auxiliary electric appliance based on NFC technology according to claim 1 is characterized by that: the second step is as follows: when the antenna coil is actually designed, the antenna is mainly influenced by the following points: coil area, coil inductance, coil Q-value, coil impedance. When the antenna is designed, the effective area of the antenna is designed to be maximized (50mm x 50mm is optimal), and the inductance value of the antenna is suitable to be between 800nH and 1.5 uH. The internal self capacitance C of the chip is 50pF, the resonant frequency can be compensated through the external matching capacitance C, and the calculation formula of the resonant frequency is
L is approximately the coil inductance and C is approximately equal to the chip internal capacitance + the external matching capacitance.
3. The method for configuring wifi parameters of auxiliary electric appliance based on NFC technology as claimed in claim 2 wherein: the second step is as follows: according to the design of the antenna, after the inductance of the coil is determined, the relation between the Q value of the coil and the impedance R of the antenna is large, the wire diameter of the coil is thick and the impedance is small when the inductance reaches, the wire width of the coil is suggested to be larger, the Q value is larger, and the calculation formula of the Q value is as follows:
Q＝2*π*f*L/R)。
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