CN104363076A

CN104363076A - Method for exchanging data by wireless message length

Info

Publication number: CN104363076A
Application number: CN201410740274.4A
Authority: CN
Inventors: 程治永
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-12-05
Filing date: 2014-12-05
Publication date: 2015-02-18

Abstract

The invention discloses a method for exchanging data by monitoring a wireless message transmitted in the air at a receiving terminal depending on the length of the wireless message at a transmitting terminal. The transmitting terminal is used for allowing the related information of data to generate a head part, encoding the head part and the data to obtain a result CODE sequence, taking CODE values in the result CODE sequence one by one, and sending a UDP (User Datagram Protocol) message taking the CODE value as a length; the receiving terminal is used for collecting the wireless message lengths by continuously monitoring the wireless messages in the air, and decoding to obtain the data of the transmitting terminal; the head part at least comprises a length, a data checksum and a head part checksum; the result CODE sequence comprises a starting characteristic CODE sequence and a load CODE sequence; the starting characteristic CODE sequence comprises starting characteristic CODEs with the same value of agreed numbers; the load CODE sequence carries the head part and the data; the starting characteristic CODE is an encoding reference value at the transmitting terminal and a decoding reference value at the receiving terminal, and has an equal difference of the wireless message length and the sent data block length, and all offset values based on the characteristic CODE can be reduced.

Description

A kind of method of carrying out exchanges data by air message length

Technical field:

The present invention relates to Wi-Fi communication, particularly relate to a kind of method of carrying out exchanges data by air message length.

Background technology:

IEEE 802.11 is standards that WLAN (wireless local area network) is general now, the standard of the wireless communication that the international motor electronic Engineering society (IEEE) of its Shi You defines.

Wi-Fi is the brand quality certification of trade mark as product of Wi-Fi Alliance manufacturer, for meeting the Wireless LAN devices of IEEE 802.11 standard.Closely related based on two cover systems, also often has people that Wi-Fi is used as the synonymous term of IEEE 802.11 standard.

Many electronic products on the market support Wi-Fi, as: smart mobile phone, panel computer, wireless network camera, wireless DVR, intelligent television, PC, game machine, MP3 player, printer, new notebook computer and other peripheral equipments.And the equipment such as wireless network camera, wireless DVR, wireless door magnetic, wireless controller do not have input/output interface easily.

Wi-Fi network is connection-oriented network, need to be linked into same network between usual equipment or set up directly connect after could swap data, the operating system operated on smart mobile phone, computer, intelligent television such as IOS limits the ability of application program, cannot modify to connect these network equipments to the network of self, can not create focus give these network equipments for connection, the exchange of data cannot be completed easily.

Summary of the invention:

Propose a kind of method of carrying out exchanges data by air message length herein, receiving terminal is by intercepting the aerial air message transmitted, and transmitting terminal carries out the method for exchanges data by air message length.

In the air message aloft transmitted, message length, source MAC, target MAC (Media Access Control) address field can not be encrypted, and in same wireless connections, air message length is strict equal difference relation with sending data block length, and data block length is determined by transmitting terminal.

The present invention realizes like this

Transmitting terminal: the relevant information of data is generated head, head and data is carried out coding and obtains result CODE sequence, takes out the CODE value in result CODE sequence one by one, the UDP message that to send with CODE value be length;

Receiving terminal: air message length, by continuing to intercept on-air radio message, collects by receiving terminal, carrying out decodes obtains the data of transmitting terminal;

Head at least comprises: length, check sum, header checksum;

Result CODE sequence is by initiation feature CODE sequence, load CODE Sequence composition;

Initiation feature CODE sequence: for the identical initiation feature CODE of the value of arranging number is formed;

Load CODE sequence: carry head and data;

Initiation feature CODE: be coding fiducial value at transmit leg is decoding fiducial value recipient, and because of air message length with to send data block length be strict equal difference relation, all deviants based on this feature CODE can be reduced recipient;

Load CODE: the value of School Affairs bit, the split of load bit, based on fiducial value, obtains load CODE by the deviant of arranging;

Escape CODE: based on the agreement deviant of fiducial value, differently with fiducial value may be used for distinguishing the CODE carrying load, for isolating two consecutive identical load CODE;

By with Wi-Fi function mobile phone, to take down notes than the intelligent terminal such as computer, intelligent television there is no the wireless network camera of convenient input/output interface, exchanges data that wireless intelligent house product carries out under notconnect state, by to the identification of data content and process, thus realize:

Wi-Fi network configuration-direct, comprises the SSID needed for access network, cryptographic parameter, completes the access of wireless network;

Cable network configuration-direct, is configured with spider lines parameter;

The instruction of factory reset, returns to factory default by Wireless Communication Equipment and arranges state;

The instruction of restarting equipment, carries out reset by Wireless Communication Equipment and restarts;

Cloth is withdrawn a garrison instruction, deploys troops on garrison duty or withdraw a garrison to wireless network camera;

Configuration, maintenance management instruction, be configured the network equipment, maintenance and management.

Accompanying drawing illustrates:

Below in conjunction with accompanying drawing, the present invention is described in detail.

Fig. 1 is coding principle figure

Fig. 2 exchanges data schematic diagram

Embodiment:

The process of coding: by being together encoded in length in valid data position and School Affairs, significantly can improve the interference defensive ability/resistance ability to other network service of transmitting terminal.

To the data calculated population School Affairs received, the higher jamproof data exchange ways of data can be realized.

In the air message aloft transmitted, data length, source MAC, target MAC (Media Access Control) address field can not be encrypted, and message length becomes strict equal difference relation with the corresponding data block length of data sending terminal, convert data to the length of message, then to the data message sending this length in the air, the method can not be subject to the impact of wireless encryption mode.

In the process of attempting decoding, identical with target MAC (Media Access Control) address for message source MAC one group can be carried out decoding and attempt, the interference between distinct device can be resisted.

Based on the method, can by with Wi-Fi function mobile phone, to take down notes than the intelligent terminal such as computer, intelligent television there is no the wireless network camera of convenient input/output interface, exchanges data that wireless intelligent house product carries out under notconnect state, by to the identification of data content and process, thus realize:

The order of Wi-Fi network configuration and SSID, cryptographic parameter needed for access network, complete the access of wireless network;

The network equipment is configured, maintenance and management.

Transmitting terminal determines according to configuration or agreement fiducial value of encoding, and generates initiation feature CODE sequence; The relevant information of data is generated head, based on fiducial value, head and data is carried out being encoded to load CODE sequence by bit, initiation feature CODE sequence and load CODE sequence are merged CODE queue as a result.

Receiving terminal detects feature CODE sequence, obtains decoding fiducial value according to feature CODE sequence, decodes, restore head and data, and carry out data check, obtain the data that transmitting terminal sends according to decoding fiducial value.

The present invention is achieved in that

Transmitting terminal and receiving terminal agreement: exchanges data initiation feature, data-bit encoding form, certain BIT number destination data and its associated check and.Data-bit encoding result successively processes through network protocol stack and finally exchanges in the air, can become the data message length that phase difference is constant.

Data receiver:

Step 1: Wi-Fi module is set as listen mode.

Step 2: channel number attempts all effective passages one by one from 1, arranges Wi-Fi module service aisle number, continues to intercept on-air radio message.

Step 3: after listening to message, divide into groups according to source MAC, target MAC (Media Access Control) address, prepare corresponding controll block, set up data length buffering area, data length Wi-Fi module listened to takes out, stored in data length buffering area: not yet enter data receiving state if current, enter step 4, otherwise enter step 5.

Step 4: then detect in length list nearest in data length buffering area whether there is exchanges data initiation feature, if had, enter data receiving state.

Step 5: by length value according to the agreement with transmitting terminal, be partitioned into data division BITS position and School Affairs part BITS position, calculated data School Affairs, and the checksum value calculating gained and the School Affairs part split from length value are verified, if do not mated, ignore this message, if coupling, enter step 6.

Step 6: step 5 the data obtained part BITS position is pushed buffering area, if the length value received reaches the length of header data first, then enters step 7; If the data length received reaches the data total length needing to receive, if arrive overall length, enter step 8; Otherwise repeat step 3;

Step 7: correctly whether detection length and header checksum, if incorrect, reset accepting state and also repeat step 3, if correct, write down the data total length needing reception, repetition step 3;

Step 8: calculate overall School Affairs and and in head the School Affairs that indicates compare, if do not mated, replacement accepting state also repeats step 3; If coupling, takes out data, enters step 9;

Step 9: understand the data received, according to the content of arranging away to respond, is processed for the request having access rights legal; If wifi configuring request, then take out ssid and password, carry out wifi setting; If the request of factory reset, then that recovers data arrives factory state; If the request of restarting equipment, then restarting equipment.

Claims

1. the present invention is achieved in that a kind of method of carrying out exchanges data by air message, and receiving terminal is by intercepting the aerial air message transmitted, and transmitting terminal carries out the method for exchanges data by air message length;

Receiving terminal: by continuing to intercept on-air radio message, air message length collected, carrying out decodes obtains the data sent of transmitting terminal.

2. as claimed in claim 1:

Head at least comprises: length, check sum, header checksum;

Load CODE sequence: carry head and data.

3. as claim 1, according to claim 2:

Escape CODE: based on the agreement deviant of fiducial value, differently with fiducial value may be used for distinguishing the CODE carrying load, for isolating two consecutive identical load CODE.

4. transmitting terminal as claimed in claim 1:

5. receiving terminal as claimed in claim 1:

6. method for interchanging data as claimed in claim 1:

Cable network configuration-direct, is configured with spider lines parameter;

7. receiving terminal as claimed in claim 1:

Wi-Fi module is set as listen mode;

Channel number attempts all effective passages one by one from 1, arranges Wi-Fi module service aisle number, continues to intercept on-air radio message;

After listening to message, divide into groups according to source MAC, target MAC (Media Access Control) address, prepare corresponding controll block, set up data length buffering area, data length Wi-Fi module listened to takes out, and processes stored in data length buffering area.