Close-range automatic file transmission method and device based on WiFi

Abstract

The invention relates to the technical field of computers, and discloses a WiFi-based close-range automatic file transmission method, which comprises the following steps: step 1, an STA receives first data; the first data is generated and broadcasted by the AP; 2, the STA judges whether the first data has transmission file enabling or not and whether the distance between the STA and the AP is smaller than a preset value or not; when the first data is enabled by a transmission file and the distance between the STA and the AP is smaller than a preset value, sending a probe request to the AP; step 3, the STA receives the probe response, and automatically obtains the SSID and the password of the AP through the WPS connection; the probe response is sent after the probe response is verified to be successful by the AP (Access Point); and step 4, the STA performs WiFi connection with the AP through the SSID and the password and receives the file. According to the automatic file transmission method, the file can be quickly and safely transmitted. Meanwhile, the invention also discloses a WiFi-based close-range automatic file transmission device.

Description

Technical Field

[0001] The present invention relates to the field of computer technology, and in particular to a method and device for automatically transmitting files over short distances based on WiFi. Background Art

[0002] Currently, when transmitting data between mobile phones, third-party software (such as WeChat, QQ, etc.) can be used for transfer and then the data is transmitted to another mobile phone through the network. This method has disadvantages such as long transmission time, increased mobile network fees, and being affected by network signals. WiFi hotspots can also be used for data transmission. However, when using WiFi hotspots, in order to have higher security, it is necessary to turn on the WiFi hotspot first, then select the corresponding WiFi hotspot and enter the password to connect. There are many operation steps, which affects the user experience.

[0003] CN202111494776 discloses a data migration method, apparatus, device and storage medium based on WiFi direct connection, the data migration method comprising: establishing a wireless connection between a sending device and a receiving device by means of WiFi direct connection; constructing a TCP transmission channel between the sending device and the receiving device; transmitting the file to be migrated from the sending device to the receiving device by means of a data packet, the data packet comprising a packet header and a packet body, the packet header comprising a packet length, a packet type and a data type, the data type being used to mark the transmission stage of the file to be migrated, the packet body comprising data content, the data content comprising the original storage path of the file to be migrated; parsing the data packet in the receiving device, and converting the parsed data packet into a new data packet. The file data obtained is saved in the first path of the receiving device, and the first path is the same as the original storage path; the wireless connection between the sending device and the receiving device is established by WiFi direct connection, including: starting the WiFi direct connection service on the receiving device, so that the receiving device can be discovered by other devices that have WiFi direct connection enabled, and registering broadcast to monitor the connection status of the receiving device; starting the scanning device service on the sending device, and updating the scanned device list through broadcast, connecting to the specified receiving device and waiting for the receiving device to accept the connection request; after the receiving device accepts the request, establishing a WiFi direct connection between the sending device and the receiving device, and monitoring the connection status between the sending device and the receiving device through broadcast.

[0004] This data migration method can quickly connect mobile phones through WiFi direct connection. However, after starting the WiFi direct connection service, the user needs to manually select the corresponding mobile phone for transmission in the list. If for higher security, a password needs to be set. The user needs to perform multiple steps to connect to the corresponding mobile phone. The operation is cumbersome and affects the user experience.

[0005] The technical problem to be solved by the present invention is: how to improve the convenience and security of file transmission between mobile phones. Summary of the invention

[0006] The main purpose of the present invention is to provide a method for automatically transmitting files in a short distance based on WiFi. By judging the distance between mobile phones and whether the first data is enabled for file transmission, the mobile phone to which the file needs to be transmitted can be automatically determined. Then, after the STA automatically obtains the SSID and password of the AP through WPS, the STA directly connects to the AP through WiFi and receives the file. The user only needs to bring the mobile phones close to each other to complete the file transmission without performing additional operations. Moreover, the convenience and security of file transmission are improved through distance restriction and password login.

[0007] At the same time, a short-distance automatic file transmission device based on WiFi is also provided.

[0008] To achieve the above objectives, the technical solutions adopted in this application are:

[0009] A method for automatically transmitting files over short distances based on WiFi comprises the following steps:

[0010] Step 1: The STA receives first data; the first data is generated and broadcast by the AP;

[0011] Step 2: The STA determines whether the first data has a file transmission enabled, and whether the distance between the STA and the AP is less than a preset value; when the first data has a file transmission enabled, and the distance between the STA and the AP is less than the preset value, a probe request is sent to the AP;

[0012] Step 3: The STA receives the probe response and automatically obtains the SSID and password of the AP through the WPS connection; the probe response is sent by the AP after the AP verifies the probe request successfully;

[0013] Step 4: STA connects to AP via WiFi using SSID and password and receives the file.

[0014] Preferably, the SSID and password are both randomly generated SSID and password; and the SSID and password are both encrypted by WPA2 CCMP.

[0015] Preferably, in step 1, the specific operation of the first data broadcast is: when no file is sent within 3 minutes, or the AP has no WiFi connection with the STA within 1 minute, the AP stops broadcasting the first data or shuts down the AP.

[0016] Preferably, in step 2, the preset value is 30 cm; the specific judgment operation of whether the distance between STA and AP is less than the preset value is: STA reads the RSSI value of AP, when the RSSI value is greater than the threshold, the distance between STA and AP is less than the preset value; when the frequency band of STA and AP is 2.4 GHz, the threshold is -24 dB; when the frequency band of STA and AP is 5 GHz, the threshold is -26 dB.

[0017] Preferably, step 3 further includes: when the AP verifies the probe request successfully, the AP records the BSSID of the STA; when the STA receives the probe response, the STA records the BSSID of the AP; and when the STA and the AP have recorded each other's BSSID, a WPS connection is established.

[0018] Preferably, the WPS connection is specifically a WPS PBC connection.

[0019] Preferably, in step 3, the specific operation of AP verifying the probe request is: AP determines whether the probe request has file transmission enabled, and whether the distance between the AP and the STA is less than a preset value; when the probe request has file transmission enabled, and the distance between the AP and the STA is less than the preset value, a probe response is sent to the STA.

[0020] Preferably, the specific operation of obtaining the SSID and password in the first data through WPS is: after STA sends a probe request, the AP starts the AP end of WPS, and then sends a probe response to STA, and the STA starts the STA end of WPS. After STA and AP complete the 8-way WPS authentication of M1-M8, STA obtains the SSID and password of AP.

[0021] Preferably, the specific operation of step 4 is: the STA performs a WiFi connection with the AP through the SSID and password, and after the STA obtains the IP of the AP, it receives the file through the IP layer.

[0022] It should be noted that:

[0023] STA: stands for "Station", which means terminal device or client device. It refers to mobile devices connected to a Wi-Fi network, such as mobile phones, tablets, laptops, etc.

[0024] AP: generally refers to a wireless access point, which is an access point of a wireless network, commonly known as a "hotspot";

[0025] probe request: sent and broadcast to the entire network. STA uses this frame to find AP for connection.

[0026] Probe response: Sent by the AP to the STA. The AP responds to the probe request through this frame, notifying the STA that it can connect to this AP.

[0027] WPS: The full name is Wi-Fi Protected Setup, which is the abbreviation of Wi-Fi Protected Setup. WPS is a certification project organized and implemented by the WiFi Alliance, which is mainly dedicated to simplifying the installation and security configuration of wireless LANs. The purpose is to allow consumers to set up wireless network devices in a simpler way and ensure a certain degree of security;

[0028] WPS PBC: PBC mode of WPS, press the WPS button to realize WPS secure connection, set to enable in WPS settings in AP, press the WPS button on the client (wireless network card), search for WPS network, press the WPS button on the AP, WPS starts link negotiation, and WPS secure connection is successfully established after a while;

[0029] SSID: Network name.

[0030] At the same time, a WiFi-based short-distance automatic file transmission device is also disclosed, comprising the following units:

[0031] Receiving unit: used to receive first data; the first data is generated and broadcasted by the AP;

[0032] A judging unit: used for judging whether the first data has a file transmission enabled, and whether the distance between the STA and the AP is less than a preset value; when the first data has a file transmission enabled, and the distance between the STA and the AP is less than the preset value, a probe request is sent to the AP;

[0033] Password acquisition unit: used to receive the probe response and automatically obtain the SSID and password of the AP through the WPS connection; the probe response is sent by the AP after the probe request is successfully verified;

[0034] Connection unit: used to connect to AP via WiFi and receive files through SSID and password;

[0035] The receiving unit, the judging unit, the password acquiring unit and the connecting unit are connected to each other in sequence.

[0036] Compared with the prior art, this solution has the following beneficial effects:

[0037] The short-distance automatic file transmission method of this solution determines the mobile phone that needs to transmit data by judging the distance between the mobile phones and whether the first data of the AP is enabled for file transmission, and then obtains the SSID and password through the WPS connection, thereby realizing automatic connection and file transmission between mobile phones.

[0038] The advantages of this method are:

[0039] 1. The distance between mobile phones is within 30cm. This range can exclude most other mobile phones from being connected by mistake, and also allow users to know who is connected face to face. Secondly, the first data has file transmission enabled, which can be distinguished from ordinary broadcast packets, further ensuring that the connected mobile phone is the mobile phone that needs to transmit data, and then obtain the AP's SSID and password through the WPS PBC connection to connect to WiFi, so that as long as the mobile phones are close to each other within 30cm, file transfer can be completed, which simplifies the process of establishing connections between mobile phones and improves the convenience and security of file transfer.

[0040] 2. Set a timeout mechanism for the first data broadcast by AP. If there is no file transfer for 3 minutes or no connection with STA for 1 minute, the AP will be shut down to ensure that files can be transferred anytime and anywhere. Moreover, after the file transfer is completed, the user does not need to perform other operations. It will be automatically shut down after 3 minutes, which simplifies the overall file transfer process, improves the user experience, and further improves the security of file transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 It is a flow chart of the detection method of the short-distance automatic file transmission method of Example 1;

[0042] Figure 2 is a vendor specific attribute graph of the first data of Example 1;

[0043] Figure 3 This is a schematic diagram of reading RSSI in Example 1;

[0044] Figure 4 This is a flowchart of the WPS connection of Example 1;

[0045] Figure 5 Schematic diagram of a short-distance automatic file transmission device according to Embodiment 2. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The components of the present application implemented as described and shown in the drawings here can be arranged and designed in various different configurations.

[0047] Example 1

[0048] refer to Figure 1-4 , a method for automatically transferring files over short distance based on WiFi, comprising the following steps:

[0049] Step 1: The STA receives first data; the first data is generated and broadcast by the AP;

[0050] In this step, the first data is a beacon packet; when the mobile phone sending the file needs to send the file, it selects the file to be sent and clicks send, the mobile phone sending the file will automatically turn on the AP, the AP generates the first data and broadcasts it to the surroundings, and in order to distinguish it from the ordinary beacon packet, the vendor specific setting attribute of the first data is the attribute of enabling the transmission of the file, such as the value of "tx_en=true", indicating that the AP has a file to transmit, and the vendor specific attributes such as Figure 2 As shown; STA receives the first data by continuously scanning.

[0051] When the AP is broadcasting the first data, if there is no file to be sent within 3 minutes, or if the AP has no WiFi connection with the STA within 1 minute, the AP stops broadcasting the first data or the mobile phone sending the file directly shuts down the AP. In this way, after the user completes the file transfer, the mobile phone sending the file can be restored to the initial state without manually operating the mobile phone sending the file. This not only reduces the user's operation steps, but also improves the security of the mobile phone sending the file.

[0052] To further improve the security of mobile phones sending files, the AP's SSID and password are randomly generated; both the SSID and password are encrypted using WPA2 CCMP.

[0053] It should be noted that AP is the hotspot of the mobile phone that sends the file, STA is the mobile phone that receives the file, and value is the attribute value. Since the AP of the mobile phone that sends the file is not necessarily always on, when the AP of the mobile phone that sends the file is not turned on, the AP will be automatically turned on; when the AP of the mobile phone that sends the file is already turned on, there is no need to turn it on again.

[0054] Step 2: STA determines whether the first data has file transmission enabled, and whether the distance between STA and AP is less than a preset value; when the first data has file transmission enabled, and the distance between STA and AP is less than a preset value, a probe request is sent to AP; when the first data has no file transmission enabled, or the distance between STA and AP is greater than a preset value, no probe request is sent.

[0055] In this step, after receiving the first data, the STA judges the attributes of the first data, determines whether the first data has file transmission enabled, and determines whether the distance between the STA and the AP is less than 30 cm; when the STA determines that the first data has file transmission enabled and the distance between the STA and the AP is within 30 cm, it sends a probe request to the AP, and the vendor specific attribute of the probe request also has a value of "rx_en=true", indicating that this probe request has file transmission enabled and this STA wants to receive the file.

[0056] Secondly, in order to further confirm that the STA is the mobile phone receiving the file, after the first data is successfully determined, a confirmation pop-up window can be set for the STA. When the user clicks to confirm, the STA sends a probe request to the AP.

[0057] This solution determines whether the distance between STA and AP is less than 30cm by reading the RSSI value to indicate the distance between STA and AP. The closer the distance, the greater the RSSI. When the frequency band between STA and AP is 2.4GHz, the RSSI value received by STA from AP is greater than -24dB, and the distance between STA and AP is less than 30cm; when the frequency band between STA and AP is 5GHz, the RSSI value received by STA from AP is greater than -246dB, and the distance between STA and AP is less than 30cm.

[0058] It should be noted that RSSI is Received Signal Strength Indication, which indicates the received signal strength. RSSI can be read through the underlying driver of WiFi, such as Figure 3As shown. By placing two mobile phones 30cm apart for testing, when the frequency band of the mobile phone is 2.4GHz, the RSSI value of the mobile phone is -24dB; when the frequency band of the mobile phone is 5GHz, the RSSI value of the mobile phone is -26dB, that is, when the frequency band of the mobile phone is 2.4GHz and the RSSI value is greater than -24dB, it means that it has entered the transmission range of 30cm; when the frequency band of the mobile phone is 5GHz, and the RSSI value is greater than -26dB, it means that it has entered the transmission range of 30cm; you can also fine-tune the RSSI threshold according to each frequency band and country code. Because each country and frequency band has restrictions on the transmission power, the RSSI threshold can be adjusted for each country and frequency band. As long as the mobile phone is within the RSSI threshold, it means that the STA and AP are within the 30cm automatic transmission range.

[0059] Step 3: The STA receives the probe response and automatically obtains the AP's SSID and password through the WPS PBC connection; the probe response is sent by the AP after successfully verifying the probe request;

[0060] In this step, after receiving the probe request, the AP verifies the probe request. The specific operations are as follows: the AP determines whether the probe request has file transmission enabled and whether the distance between the AP and the STA is less than the preset value; and the method of determining whether the distance between the AP and the STA is less than 30cm is the same as the method of determining whether the distance between the STA and the AP is less than 30cm in step 2; when the probe request has file transmission enabled and the distance between the AP and the STA is less than 30cm, the AP end of the WPS PBC connection is started (equivalent to automatically pressing the WPS button of the AP), and a probe response is sent to the STA. The vendorspecific attribute of the probe response has a value of "tx_en=true", indicating that this probe response has file transmission enabled. When the probe request does not have file transmission enabled, or the distance between the AP and the STA is greater than 30cm, the probe response is not sent.

[0061] After receiving the probe response, the STA starts the STA end of the WPS PBC connection (equivalent to automatically pressing the STA's WPS button). The STA starts the WPS PBC connection with the AP. After the STA and AP complete the 8-way WPS authentication of M1-M8, the STA obtains the AP's SSID and password. Figure 4For the specific acquisition process, please refer to https: / / bbs.16rd.com / thread-582566-1-1.html.

[0062] To further improve the security of WPS connection, after AP successfully verifies probe request, AP records STA's BSSID. After STA receives probe response, it also records AP's BSSID. Only when STA and AP both record each other's BSSID can WPS connection be established. In this way, third-party STA is prevented from triggering WPS connection with AP at this time, ensuring that AP and target STA establish WPS connection, and improving the security of WPS connection.

[0063] Step 4: STA connects to AP via WiFi using SSID and password and receives the file.

[0064] In this step, after the STA obtains the SSID and password of the AP, it uses the SSID and password to connect to the AP through normal WiFi. After the connection is successful, it obtains the IP of the AP and receives the file through the IP layer (network layer). After the connection is successful, the distance between the mobile phones does not need to be kept within 30cm, and they can move automatically within the transmission range of WiFi, which improves the user experience.

[0065] Secondly, multiple STAs can be connected to the AP in the same connection mode. That is to say, as long as the distance between multiple mobile phones and the AP is within 30 cm and the received first data has file transmission enabled, multiple mobile phones can receive files at the same time.

[0066] The core advantages of this solution are:

[0067] By limiting the distance between mobile phones to within 30cm for file transmission, most mobile phones that do not need to receive files can be excluded from connecting to the AP. The STA then determines whether the first data is enabled for data transmission, so that the STA receiving the file and the AP sending the file can achieve accurate connection. Finally, the STA and the AP are connected through WPS PBC, automatically obtain the SSID and password of the AP, and automatically connect to WiFi to achieve automatic connection between the STA and the AP. In other words, after the mobile phone sending the file selects the file and clicks to send, it only needs to bring the mobile phone receiving the file close to the mobile phone sending the file within 30cm, and the mobile phone receiving the file can automatically receive the file without performing other operations. This greatly simplifies the connection process between mobile phones, improves the efficiency of file transmission, and limits short-distance transmission to improve the security of file transmission.

[0068] Example 2

[0069] refer to Figure 5, a short-distance automatic file transmission device based on WiFi, comprising the following units:

[0070] Receiving unit: used to receive first data; the first data is generated and broadcasted by the AP;

[0071] A judging unit: used for judging whether the first data has a file transmission enabled, and whether the distance between the STA and the AP is less than a preset value; when the first data has a file transmission enabled, and the distance between the STA and the AP is less than the preset value, a probe request is sent to the AP;

[0072] Password acquisition unit: used to receive the probe response and automatically obtain the SSID and password of the AP through the WPS connection; the probe response is sent by the AP after the probe request is successfully verified;

[0073] Connection unit: used to connect to AP via WiFi and receive files through SSID and password;

[0074] The receiving unit, the judging unit, the password acquiring unit and the connecting unit are connected to each other in sequence.

[0075] In this embodiment, the specific working process of the short-distance automatic file transmission device is as follows: the receiving unit receives the first data generated and broadcasted by the AP, and sends the first data to the judging unit; the judging unit judges the attribute of the first data, and reads the RSSI value through the bottom driver of the Wi-Fi. The larger the RSSI value, the closer the distance is, so as to judge the distance between the STA and the AP. When the first data has the file transmission enable and the distance between the STA and the AP is less than 30 cm, the judging unit sends a probe request to the AP, the AP receives the probe request and verifies whether the probe request has the file transmission enable and judges the distance between the AP and the STA. When the probe request has the file transmission enable and the distance between the AP and the STA is less than 30 cm, the AP sends a probe response to the judging unit, the judging unit transmits the probe response to the password obtaining unit, after receiving the probe response, the password obtaining unit starts the WPS connection between the STA and the AP, obtains the SSID and password of the AP through the WPS connection, and transmits the SSID and password to the connecting unit. The connecting unit performs a normal WiFi connection with the AP through the SSID and password, obtains the IP of the AP, and receives the file transmitted by the AP through the IP layer.

[0076] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for automatic file transmission over short distance based on WiFi, characterized in that: The following steps are involved: Step 1: The STA receives first data; the first data is generated and broadcast by the AP; Step 2: The STA determines whether the first data has a file transmission enabled, and whether the distance between the STA and the AP is less than a preset value; when the first data has a file transmission enabled, and the distance between the STA and the AP is less than the preset value, a probe request is sent to the AP; Step 3: STA receives the probe response and automatically obtains the AP's SSID and password through the WPS connection; the probe response is sent by the AP after successfully verifying the probe request; Step 4: STA connects to AP via WiFi using SSID and password and receives the file.

2. The method for automatic file transmission based on WiFi at short distance according to claim 1, characterized in that: The SSID and password are both randomly generated; the SSID and password are both encrypted by WPA2CCMP.

3. The method for automatic file transmission based on WiFi in a short distance according to claim 1, characterized in that: In the step 1, the specific operation of the first data broadcast is: when no file is sent within 3 minutes, or the AP has no WiFi connection with the STA within 1 minute, the AP stops broadcasting the first data or shuts down the AP.

4. The method for automatically transferring files over short distance based on WiFi according to claim 1, characterized in that: In step 2, the preset value is 30 cm; the specific judgment operation of whether the distance between STA and AP is less than the preset value is: STA reads the RSSI value of AP, when the RSSI value is greater than the threshold, the distance between STA and AP is less than the preset value; when the frequency band of STA and AP is 2.4 GHz, the threshold is -24 dB; when the frequency band of STA and AP is 5 GHz, the threshold is -26 dB.

5. The method for automatic file transmission based on WiFi at short distance according to claim 1, characterized in that: The step 3 also includes: when the AP verifies the probe request successfully, the AP records the BSSID of the STA; when the STA receives the probe response, the STA records the BSSID of the AP; and when the STA and the AP have recorded each other's BSSID, a WPS connection is performed.

6. The method for automatic file transmission based on WiFi in a short distance according to claim 1, characterized in that: The WPS connection is specifically a WPS PBC connection.

7. The method for automatically transferring files over short distance based on WiFi according to claim 1, characterized in that: In step 3, the specific operation of the AP verifying the probe request is: the AP determines whether the probe request has file transmission enabled, and whether the distance between the AP and the STA is less than a preset value; when the probe request has file transmission enabled, and the distance between the AP and the STA is less than the preset value, a probe response is sent to the STA.

8. The method for automatically transferring files over short distance based on WiFi according to claim 6, characterized in that: The specific operation of obtaining the AP's SSID and password through WPS is as follows: after the STA sends a probe request, the AP starts the AP side of WPS and then sends a probe response to the STA. The STA starts the STA side of WPS. After the STA and the AP complete the 8-way WPS authentication of M1-M8, the STA obtains the AP's SSID and password.

9. The method for automatically transferring files over short distance based on WiFi according to claim 1, characterized in that: The specific operation of step 4 is: the STA connects to the AP through WiFi through the SSID and password, and after the STA obtains the IP of the AP, it receives the file through the IP layer.

10. A short-distance automatic file transmission device based on WiFi, characterized in that: The following units are included: Receiving unit: used to receive first data; the first data is generated and broadcasted by the AP; A judging unit: used to judge whether the first data has a file transmission enabled, and whether the distance between the STA and the AP is less than a preset value; when the first data has a file transmission enabled, and the distance between the STA and the AP is less than the preset value, a probe request is sent to the AP; Password acquisition unit: used to receive the probe response and automatically obtain the SSID and password of the AP through the WPS connection; the probe response is sent by the AP after the probe request is successfully verified; Connection unit: used to connect to AP via WiFi and receive files through SSID and password; The receiving unit, the judging unit, the password acquiring unit and the connecting unit are connected to each other in sequence.

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