CN111918251A

CN111918251A - Bluetooth transmission system and method based on UUID information channel

Info

Publication number: CN111918251A
Application number: CN201910384090.1A
Authority: CN
Inventors: 涂岩恺; 曹亚光
Original assignee: Xiamen Yaxon Networks Co Ltd
Current assignee: Xiamen Yaxon Networks Co Ltd
Priority date: 2019-05-09
Filing date: 2019-05-09
Publication date: 2020-11-10

Abstract

The invention discloses a Bluetooth transmission system and a Bluetooth transmission method based on a UUID information channel, which are used for data transmission in an announcement mode through the UUID information channel and are applied to pairing-free communication of a Bluetooth host and at least one Bluetooth slave, wherein the host generates a state UUID which can be read by the slave, so that pairing-free rapid Bluetooth one-to-many communication service is established, a message UUID is generated on the host or the slave to wait for being read by target equipment, the data transmission is realized, and the generated message UUID is periodically and automatically eliminated so as to realize the continuous updating of the data transmission. The Bluetooth transmission system and the Bluetooth transmission method are suitable for rapidly transmitting data with small data volume without pairing on the occasion that the identities of two communication parties are relatively credible.

Description

Bluetooth transmission system and method based on UUID information channel

Technical Field

The invention relates to the field of Bluetooth communication, in particular to a Bluetooth transmission system and a Bluetooth transmission method based on a UUID information channel.

Background

Bluetooth is a common technology for short-range communication of mobile devices, but there are several problems in bluetooth applications in general:

1. pairing is required to communicate: the pairing time is long, manual pairing is generally required (such as password input or check code input), if the services supported by the bluetooth chips of the two parties do not match, the pairing failure is caused with a certain probability, and therefore, waiting for the pairing result before bluetooth communication is not only slow and troublesome, but also can cause pairing failure.

2. Only one-to-one communication is possible, and one-to-many communication is not possible.

In some application scenarios, the identity between users is relatively trusted, for example, in a vehicle, a vehicle center control system and a driver or passenger mobile phone implement rapid one-to-many communication to deliver navigation, driving or other social and entertainment information. Or in a classroom, the PAD of the student and the teaching computer realize rapid one-to-many communication and transmit teaching information such as the first answer and the interaction. Under the scene, the requirement of quick one-to-many communication is met by skipping the Bluetooth pairing process.

In bluetooth communications, the services that each bluetooth device can provide are represented by a "globally unique identifier" (UUID). For example, the UUID of the bluetooth serial port service is 00001101-; the UUID of the Bluetooth dial-up network service is 00001103-. The UUID is generally in the form of 8-4-4-4-12 characters, each character is represented in hexadecimal, ranges from 0 to F and occupies 4 bits, so that one UUID can theoretically bear 16 bytes of information at most.

During bluetooth communication, the bluetooth device searches for bluetooth nodes (identified by bluetooth MAC addresses) existing around and services (i.e., UUID lists) that each node can provide through a bluetooth search protocol bsdp (bluetooth Service Discovery protocol). Therefore, the Bluetooth MAC address and UUID information of the Bluetooth node can be obtained by the general BSDP protocol of Bluetooth.

The bluetooth UUID allows private UUIDs to be set in addition to providing public services to provide customized services.

Therefore, those skilled in the art are dedicated to develop a bluetooth transmission system and a bluetooth transmission method, which utilize a UUID channel to realize pairing-free one-to-many communication and quickly transmit data with a small data amount on the occasion that the identities of two communication parties are relatively credible.

Disclosure of Invention

The invention aims to provide a Bluetooth transmission system and a Bluetooth transmission method based on a UUID information channel, which realize pairing-free one-to-many communication and quickly transmit data with small data volume by utilizing the UUID information channel under the condition that the identities of two communication parties are relatively credible.

In order to achieve the purpose, the invention provides the following technical scheme:

a Bluetooth transmission system based on UUID information channel is applied to pairing-free communication between a Bluetooth host and at least one Bluetooth slave, wherein the Bluetooth host is used for:

generating a state UUID for identifying and providing a pairing-free one-to-many communication service;

generating a message UUID, wherein the message UUID encapsulates data to be transmitted;

eliminating a message UUID, wherein the message UUID is automatically eliminated after a period T;

scanning a UUID (universally unique identifier) of a Bluetooth slave machine, and receiving data sent from the Bluetooth slave machine to a Bluetooth host machine;

the Bluetooth slave is used for:

scanning the state UUID of the Bluetooth host, and identifying and accepting pairing-free one-to-many communication service;

scanning a UUID (universally unique identifier) of a Bluetooth host, and receiving data sent by the Bluetooth host to a Bluetooth slave;

and eliminating the message UUID, wherein the message UUID is automatically eliminated after a period T.

Further, the state UUID includes:

a static area for identifying a pairing-free one-to-many communication service;

the dynamic area comprises a unicast mark and a broadcast mark of the Bluetooth host and is used for uniquely identifying the Bluetooth host and the type of the information UUID;

the message UUID includes:

the flag bit is used for setting a unicast flag or a broadcast flag of the Bluetooth host;

the serial number is used for marking the sequence of the UUIDs;

and a data area for the presence of data to be transmitted; and dividing the data to be transmitted into a plurality of message UUIDs according to the serial number sequence.

Further, the state UUID is in a hexadecimal character form of "8-4-4-4-12", the dynamic area is a 2 nd character segment and a 3 rd character segment of the state UUID, and the static area is other character segments of the state UUID.

Further, the broadcast mark and the unicast mark are generated through a HASH algorithm according to the unique long information of the host.

Further, the unique long information includes at least one of a MAC address and an IMEI.

Further, the message UUID includes:

a broadcast message UUID, wherein a broadcast mark is set at a mark bit of the broadcast message UUID;

and a unicast message UUID, wherein a unicast mark is set at the mark bit of the unicast message UUID, and an MAC address area is also arranged between the stream number area and the data area and used for marking the MAC address of a data transmission target.

Further, the MAC address area is 12 hexadecimal characters.

The invention also provides the following technical scheme:

a Bluetooth transmission method based on UUID information channel comprises

(1) One-to-many communication service confirmation: the host generates a state UUID, provides a unique broadcast mark and a unique unicast mark for identifying and providing one-to-many communication service, and the slave reads the state UUID, acquires the broadcast mark and the unicast mark of the host and receives the one-to-many communication service;

(2) broadcast communication service of host: the method comprises the steps that a host generates a broadcast message UUID, a frame header of the broadcast message UUID comprises a broadcast mark, and a slave reads the broadcast message UUID, identifies the broadcast mark and reads data in the broadcast message UUID;

(3) unicast service of the host: the method comprises the steps that a host generates a unicast message UUID, a frame header of the unicast message UUID comprises a unicast mark and an MAC address of a target slave, the slave reads the unicast message UUID, identifies the unicast mark and the MAC address, and reads data in the unicast message UUID of which the MAC address is the same as the MAC address of the host;

(4) unicast service of the slave: the slave machine generates a unicast message UUID, the frame header of the unicast message UUID comprises a unicast mark of a target host machine and an MAC address of the target host machine, the host machine reads the unicast message UUID, identifies the unicast mark and the MAC address and reads data in the unicast message UUID, wherein the unicast mark is the same as the unicast mark of the host machine, and the MAC address is the same as the MAC address of the host machine;

(5) in the working state, keeping the UUID in the state unchanged;

(6) generation and elimination of message UUID: the message UUID comprises a broadcast message UUID and a unicast message UUID, the sending sequence of the message UUID is marked through serial numbers when the message UUID is generated, and the message UUID is automatically eliminated after T time passes after the message UUID is generated.

The Bluetooth transmission system and the Bluetooth transmission method based on the UUID information channel utilize the Bluetooth UUID information to transmit data in an announcement mode, realize pairing-free rapid Bluetooth one-to-many communication service, and are suitable for rapidly transmitting data with small data volume in a pairing-free manner on the occasion that the identities of two communication parties are relatively credible.

Drawings

FIG. 1 is a state UUID partition diagram of the present invention;

FIG. 2 is a broadcast message UUID partition diagram of the present invention;

FIG. 3 is a diagram of a unicast message UUID partition of the present invention;

fig. 4 is a service flow diagram of the present invention.

Detailed Description

To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.

The invention will now be further described with reference to the accompanying drawings and detailed description.

The invention discloses a Bluetooth transmission system and a Bluetooth transmission method based on a UUID information channel, which are not paired on the basis of obtaining the MAC address and the UUID information of a Bluetooth node, but identify the communication identity by the MAC address and combine special UUID information to directly transmit data so as to realize the quick one-master-to-many-slave one-to-many communication without pairing.

Specifically, as shown in fig. 1, 2, and 3, two types of private UUIDs are defined, one is a status UUID, and the other is a message UUID.

A state UUID for identifying that the bluetooth host (hereinafter referred to as the host) currently provides bluetooth pairing-free one-to-many communication service, and providing a unique code for identifying the host, the unique code comprising two parts: a broadcast flag and a unicast flag for indicating the category of the information UUID provided.

As shown in fig. 1, the status UUID is divided into a static area and a dynamic area. The static area and the dynamic area can be divided by using a certain convention rule, for example, the 2 nd and 3 rd character segments in the form of hexadecimal characters of 8-4-4-4-12 are dynamic areas, namely 8 hexadecimal characters, and the rest are static areas.

The static area is used for indicating that the current host provides pairing-free fast one-to-many transmission service, and the provided static identification requirement can ensure that the provided static identification is different from all UUIDs of the existing protocol. The traditional Bluetooth node which does not support the pairing-free one-to-many communication service cannot be connected with the host because the UUID cannot be identified, so that the service cannot be interfered by other common Bluetooth nodes. For a Bluetooth slave machine (hereinafter, referred to as a slave machine) supporting pairing-free one-to-many communication service, after the state UUID of the master machine is identified, the Bluetooth slave machine can know that pairing-free communication can be carried out with the master machine.

The dynamic zone is used for a host to identify broadcast and unicast flags for one-to-many communication with the current host. The dynamic region is divided into two parts, in this exemplary description, the 2 nd character segment in the form of "8-4-4-4-12" hexadecimal character is used to set the broadcast flag, and the 3 rd character segment is used to set the unicast flag, that is, the broadcast flag and the unicast flag each occupy 4 bytes. The broadcast mark and the unicast mark of each host are different from those of other hosts, so that message confusion is prevented when two hosts appear in the same area. There are many known methods for ensuring that the flag bits of different hosts are different, for example, HASH calculation is performed on the unique long identifier such as the MAC address, IMEI number, and SIM number of the host to obtain a unique short identifier as the flag bit, and in this example, it is assumed that the generated broadcast flag is 7E7D and the unicast flag is 7C 7B.

The message UUID can be divided into a broadcast message UUID and a unicast message UUID according to the sending type, the broadcast message UUID is divided into a mark area, a serial number area and a data area, and the unicast message UUID is divided into a mark area, a serial number area, an MAC address area and a data area. The several fields may be divided according to a predetermined convention, as shown in fig. 2 and 3, which shows a specific embodiment, the convention flag field is 4 bytes, the serial number field is 4 hexadecimal characters, and the MAC address field is 12 hexadecimal characters.

According to the sending category of the message UUID, the broadcast flag of the flag region duplication state UUID of the broadcast message UUID indicates that the UUID is used for transmitting broadcast data, the unicast flag of the flag region duplication state UUID of the unicast message UUID indicates that the UUID is used for transmitting unicast data, for example, the flag region 7E7D indicates that the message UUID is used for transmitting broadcast data, the flag region 7C7B indicates that the UUID is used for transmitting unicast data, and the serial number region is used for indicating the sequence number of the message UUID in the same message UUID sequence, wherein 0001 indicates the first frame information UUID in the information UUID sequence, and the data region is used for transmitting information data. When the mark is unicast data, the MAC address area is used for storing the MAC address of the unicast communication target.

As shown in fig. 4, the process of the bluetooth transmission method based on UUID information channel of the present invention includes: "pairing-free fast one-to-many transport service" acknowledgement and information transfer.

Step S1, "pairing-free fast one-to-many transmission service" confirmation:

when the host is to provide a "pairing-free fast one-to-many transmission service", the host generates a status UUID for indicating to the peripheral bluetooth nodes that the current host provides a "non-pairing one-to-many communication service". Based on the unique long information such as the MAC address and IMEI of the host, a 4-byte broadcast flag (assumed to be 7E7D) and a 4-byte unicast flag (assumed to be 7C7B) are generated by the HASH algorithm. The host generates a state UUID of AAAAAA-7E7D-7C 7B-CCCC-DDDDDDDDDDDD. The state UUID is always present during communication and does not change during operation.

The slave machine scans peripheral Bluetooth nodes by using a BSDP protocol, extracts dynamic area data in a UUID after reading the state UUID of the host machine to obtain a broadcast mark 7E7D and a unicast mark 7C7B, and receives pairing-free rapid one-to-many transmission service.

Through the steps, the host and the slave realize the confirmation of 'pairing-free rapid one-to-many transmission service'.

The 'pairing-free rapid one-to-many transmission service' adopts a whiteboard informing mode to carry out communication, data to be transmitted by a host and a slave are displayed in a UUID list of the host and the slave through a UUID channel and are updated at regular time, and the opposite device obtains the data which is transmitted by a target device by reading UUID information of the target device.

After the service is confirmed, the master and the slave can perform information transfer, and the master and the slave can perform information transfer in the following manner.

Step S2, the master transfers a message to the slave:

(1) host broadcast delivery message:

the host generates a broadcast message UUID starting from a broadcast mark, a message UUID sequence comprises at least one message UUID, the message UUID generated by the host is assumed to be 7E7D0001-AAAA-BBBB-CCCC-DDDDDDDDDDDD and used for transmitting broadcast data, the stream number is 0001 and used as the first message UUID in the message UUID sequence, and the Bluetooth node can operate N UUIDs at most, so that N-1 message UUIDs can be hung at most after the state UUID.

The slave 7E7D identifies the broadcast message UUID, extracts the data area and the serial number, and splices all the data areas according to the serial number to obtain the message transmitted by the host.

(2) The master transfers messages individually for a slave:

the master generates a unicast message UUID headed by a unicast flag, which sets unicast flag 7C7B and the MAC address of the target slave.

The slave machine reads the UUID of the host machine, the 7C7B is used for identifying the UUID of the unicast message, the data, the serial number and the MAC address of the data area are read, the MAC address is taken as the message of the MAC address of the slave machine, all the data areas are spliced according to the serial number to obtain the transmitted data, and therefore the unicast transmission of the message is achieved.

Step S3, the slave transmits the message to the master individually:

the slave generates a unicast message UUID, at this time, the flag bit of the message UUID sequence is 7C7B, which indicates that the UUID is used for transmitting unicast data, the MAC address is a host MAC address, and indicates that the transmission direction of the data is from the slave to the host.

To achieve continuous information transfer, the sent message UUID needs to be eliminated.

Step S4, elimination of the message UUID:

and setting the time period of occurrence of a message UUID as X seconds, and after X seconds, considering that the message is received by the slave machine, so that after X seconds, eliminating the message UUID to free up a UUID space for generating a new message UUID, thereby realizing continuous information transmission.

The Bluetooth transmission system and the Bluetooth transmission method based on the UUID information channel utilize the Bluetooth UUID information to transmit data in an announcement mode, realize pairing-free rapid Bluetooth one-to-many communication, and are suitable for rapidly transmitting data with small data volume in a pairing-free manner on the occasion that the identities of two communication parties are relatively credible.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A bluetooth transmission system based on UUID information channel, its characterized in that: the Bluetooth system comprises a Bluetooth host and at least one Bluetooth slave, wherein the Bluetooth host is used for:

the Bluetooth slave is used for:

2. The bluetooth transmission system according to claim 1, characterized in that: the state UUID includes:

a static area for identifying a pairing-free one-to-many communication service;

the message UUID includes:

the serial number is used for marking the sequence of the UUIDs;

and a data area for the presence of data to be transmitted; and the data to be sent is divided into a plurality of message UUIDs according to the serial number sequence.

3. The bluetooth transmission system according to claim 2, characterized in that: the state UUID is

The dynamic area is in a hexadecimal character form of 8-4-4-4-12, the 2 nd character segment and the 3 rd character segment of the state UUID are respectively provided with 8 hexadecimal characters in total, and the static area is other character segments of the state UUID.

4. The bluetooth transmission system according to claim 3, characterized in that: the broadcast mark and the unicast mark are generated through a HASH algorithm according to the unique long information of the host.

5. The bluetooth transmission system according to claim 4, characterized in that: the unique long information comprises at least one of a MAC address and an IMEI.

6. The bluetooth transmission system according to claim 2, characterized in that: the message UUID includes:

7. The bluetooth transmission system according to claim 6, characterized in that: the MAC address area is 12 hexadecimal characters.

8. A Bluetooth transmission method based on a UUID information channel is characterized in that: comprises that

(5) in the operation process, the state UUID is kept unchanged;