CN106878926B - Data transmission method based on low-power-consumption Bluetooth, slave master device and system - Google Patents

Abstract

The invention relates to the technical field of bluetooth, and discloses a data transmission method based on low-power bluetooth, a slave-master device and a system. In an embodiment of the present invention, a data transmission method based on low-power bluetooth is provided, including: sending a first type of broadcast from a slave device, where the first type of broadcast includes: the name of the slave device; connection request to realize the pairing connection with the master device, the connection request includes the address of the master device; record the address; disconnect the connection with the master device; send the second type of broadcast to the address, the second type of broadcast The broadcast includes the payload to be transmitted. The embodiment of the present invention makes the number of slave devices expanded when a master device communicates with multiple slave devices, the communication delay is small, stable, and the cost is low, and at the same time, it is suitable for existing Bluetooth Low Energy (BLE) devices, more conducive to promotion.

Description

A data transmission method, slave master device and system based on low-power bluetooth

technical field

The present invention relates to the field of Bluetooth technology, in particular to a data transmission method, slave-master device and system based on low-power bluetooth.

Background technique

With the rapid development of electronic technology, wireless connection technology has been more and more widely used in people's life and work. For example, a smartphone controls a smart TV via a wireless connection. Bluetooth technology is a wireless connection technology that develops rapidly and is widely used.

The data transmission method of Bluetooth is generally based on the Bluetooth protocol, and currently, the Bluetooth Low Energy (BLE) protocol is widely used. The data interaction process of traditional low-power Bluetooth is: the slave device (Slave) initiates a device broadcast (connectable undirected advertising event) in the broadcast channel, where the device broadcast contains information such as the device name, service type, etc.; the master device (Master) in After monitoring the broadcast of the slave device (Slave), if it is necessary to exchange data with the slave device (Slave), a connection request is initiated, wherein the connection request includes parameters such as connection interval and frequency hopping parameters. The slave device (Slave) responds to the connection request, and establishes a connection with the master device (Master) according to the connection interval and frequency hopping parameters in the connection request. Usually, the connection in the Bluetooth low energy protocol means that within the agreed time period, both parties are connected. To a specified physical channel, the connection only exists in the data channel opposite to the broadcast channel. The slave device (Slave) maintains the synchronization frequency hopping with the master device (Master) according to the connection interval, frequency hopping parameters and other parameters, thereby maintaining the connection. ; The master device (Master) and the slave device (Slave) complete data communication in the established connection channel. After the data communication is completed, the master device (Master) or the slave device (Slave) is disconnected.

In the process of implementing the present invention, the inventor found that in the currently commonly used Bluetooth Low Energy (BLE) protocol standard, a central node can communicate with up to seven slave nodes. Therefore, when a master device (Master) communicates with multiple slave nodes, When the device (Slave) communicates, the number of slave devices is limited. The master device (Master) takes turns to establish a communication connection with each slave device (Master), and obtains the payload of each slave device (Slave) through periodic polling, but this The communication mode is prolonged; and usually the master device of low-power bluetooth is generally a smart device, such as a mobile phone, set-top box, etc., the application software usually used on smart devices cannot achieve accurate timing of the underlying low-power bluetooth device. Control, when a master device (Master) communicates with more than four slave devices (Slave), the probability of communication failure is greatly increased. Although the bluetooth ad hoc network (BLE MESH) method can solve the limitation of the number of slave devices, the device in communication must be used as both a master device and a slave device, which increases the hardware cost of the device, and cannot be used with other devices. If a device without the Bluetooth Ad Hoc Network (BLEMESH) function communicates, the communication is limited, which is not conducive to promotion.

SUMMARY OF THE INVENTION

The purpose of the embodiments of the present invention is to provide a data transmission method based on low-power bluetooth, a slave master device and a system. When a master device communicates with multiple slave devices, the number of slave devices is expanded, and the communication delay is small. Stable, low cost, conducive to promotion.

In order to solve the above technical problems, embodiments of the present invention provide a data transmission method based on low-power bluetooth, including: sending a first type of broadcast from a device, and the first type of broadcast includes: the name of the slave device; The connection request and virtual connection parameters from the master device realize the pairing connection with the master device; disconnect the connection with the master device; send the second type of broadcast to the master device according to the virtual connection parameters, so The second type of broadcast includes the payload to be transmitted.

Embodiments of the present invention also provide a data transmission method based on low-power Bluetooth, including: a master device receives a first type of broadcast from a slave device, where the first type of broadcast includes: the name of the slave device; From the device name, send a connection request and virtual connection parameters to the slave device; after receiving the confirmation for the virtual connection parameters from the slave device, receive the first request from the slave device according to the virtual connection parameters. Class II broadcast; parsing the payload from the second class broadcast.

An embodiment of the present invention further provides a slave device, comprising: a first sending module for sending a first type of broadcast, where the first type of broadcast includes: a slave device name; a first receiving module for respectively receiving The connection request and virtual connection parameters from the master device realize the pairing connection with the master device; the disconnection module is used to disconnect the connection with the master device; the first sending module is also used for according to the virtual connection parameters, and send a second type of broadcast to the master device, where the second type of broadcast includes the payload to be transmitted.

An embodiment of the present invention further provides a master device, comprising: a second receiving module for receiving a first type of broadcast from a slave device, where the first type of broadcast includes: the name of the slave device; a second sending module, is configured to send a connection request and virtual connection parameters to the slave device according to the name of the slave device; the second receiving module is further configured to, after receiving the confirmation for the virtual connection parameter from the slave device, , receiving the second-type broadcast from the slave device according to the virtual connection parameter; the processing module is configured to parse the payload from the second-type broadcast.

Embodiments of the present invention further provide a data transmission system based on Bluetooth low energy consumption, including: the above-mentioned slave device and the above-mentioned master device.

Compared with the prior art, in the embodiment of the present invention, when multiple slave devices communicate with the master device, the slave devices transmit the payload with the master device by sending a timed broadcast, and only a short-term connection needs to be established between the master and slave devices. The master device does not need to communicate with the slave devices through polling, so it is not limited by the communication between a master device and a limited number of slave devices in the Bluetooth Low Energy (BLE) protocol, so that a master device can communicate with multiple slave devices at the same time. For communication, it directly expands the number of slave devices that the master device can communicate with. In the above process, the master and slave devices have only a short-term connection, and then the transmission of the payload can be regarded as a virtual connection, so that the BLE device does not need to maintain a dedicated communication channel connection for data transmission, which reduces the power consumption of the BLE device. At the same time, the slave device Transmission of data through the second type of broadcast makes the response speed of data communication fast, reduces the communication delay, and stabilizes communication; and the broadcast communication method is suitable for all devices that comply with the Bluetooth Low Energy (BLE) protocol, reducing the need for equipment. cost of improvement.

In addition, the virtual connection parameters include: a master device key; the payload sent to the master device is a payload encrypted with a target key, and the target key is based on the pre-stored slave device key and The master device key is generated. The target key is generated by the respective keys of the master and slave devices, and the payload in the second type of broadcast is encrypted by the target key, which enhances the security of payload transmission.

In addition, the virtual connection parameters include: a transmission period and a transmission channel. The second type of broadcast is sent through the transmission period and transmission channel agreed between the master and slave devices. Since the master device knows the time of data reception, it can only work when it needs to receive data, which further reduces the power consumption of the master device and the slave device. By predicting the transmission channel, the master and slave can transmit the payload more accurately and avoid omission.

Description of drawings

FIG. 1 is a flowchart of a data transmission method based on Bluetooth low energy consumption according to a first embodiment of the present invention;

2 is a schematic diagram of a data transmission interaction process between a slave device and a master device according to the first embodiment of the present invention;

FIG. 3 is a flowchart of a data transmission method based on Bluetooth low energy consumption according to a second embodiment of the present invention;

4 is a schematic structural diagram of a slave device according to a third embodiment of the present invention;

5a is a schematic structural diagram of a master device according to a fourth embodiment of the present invention;

5b is a schematic structural diagram of another master device according to the fourth embodiment of the present invention;

6 is a schematic structural diagram of a data transmission system based on Bluetooth low energy consumption according to a fifth embodiment of the present invention;

7 is a schematic diagram of the content of the first type of broadcast according to the first embodiment of the present invention;

8 is a schematic diagram of the content of virtual connection parameters according to the first embodiment of the present invention;

FIG. 9 is a schematic diagram of the content of the second type of broadcast according to the first embodiment of the present invention.

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, each embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can appreciate that, in the various embodiments of the present invention, many technical details are set forth in order for the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can be realized.

The first embodiment of the present invention relates to a data transmission method based on Bluetooth low energy consumption. The method is mainly applied to the slave device of low energy bluetooth data transmission. The specific process is shown in Figure 1, including:

Step 101: The slave device sends the first type of broadcast.

Specifically, as shown in FIG. 7 , the first type of broadcast may include: slave device name 702 , and may also include: slave device address 701 , service type 703 , broadcast interval 704 and slave device key 705 . The slave device sends the first type of broadcast on three broadcast channels defined by the Bluetooth Low Energy (BLE) standard with a certain period (ie, the first type of broadcast period). Among them, the number of slave devices is not limited. Multiple slave devices can send the first broadcast on three broadcast channels, or one slave device can send the first broadcast on three broadcast channels; the master device can send the first broadcast on three broadcast channels. The channel can search for a slave device that meets the requirements according to the device name in the received first type of broadcast. When the master device searches for the required slave device, the master device initiates a connection request to the slave device.

For example, the existing slave device A, slave device B, master device C, slave device A and slave device B send the first type of broadcast every 125ms, and the first type of broadcast of slave device A contains the device name "slave device A" , the first type of broadcast from device B contains the device name "slave device B". Master device C listens to the first type of broadcast sent by slave device A and slave device B. Now master device C needs to connect to the device whose device name is "slave device B", then master device C initiates a connection request to slave device B.

It is worth mentioning that the key of the slave device in the first type of broadcast can be a random key, such as a random key generated by using a random number. That is to say, the slave device key can be generated by using a random number every other cycle; the slave device key can also be generated using a random number every two or more cycles.

Step 102: Receive a connection request and virtual connection parameters from the master device.

Specifically, the connection request includes frequency hopping information and time interval, and the slave device establishes a communication connection with the master device according to the frequency hopping information and time interval in the connection request. The connection request and the subsequent pairing process for forming a connection are described in detail in the Bluetooth Low Energy (BLE) standard, so they will not be described in detail here.

Step 103: Receive virtual connection parameters from the master device.

Specifically, as shown in Figure 8, the virtual connection parameters include: master device address 801, slave device address 701, connection interval 802 (ie the second type of broadcast period), master device key 803 and broadcast channel selection 804 (ie virtual The broadcast channel to be used for the connection), which can be one or more of the three broadcast channels defined in the BLE protocol.

It is worth mentioning that since the master device does not receive confirmation information after sending a connection request, it cannot confirm whether the connection is successful. The data channel sends virtual connection parameters to the slave device.

Step 104: Disconnect from the master device.

Specifically, in the classic Bluetooth low energy protocol, maintaining the actual connection is a process that consumes a lot of energy and bandwidth. Therefore, in order to reduce the power consumption of the master device and the slave device, the need for establishing a virtual connection is saved in the slave device. After the data (master device address, second type of broadcast period, master device key, virtual connected broadcast channel), the connection with the master device is immediately disconnected, so that the direct connection between the slave device and the master device is only maintained for a short time. , the actual connection process is generally maintained within 100ms. The master device establishes a short actual connection with the slave device, and then the process of data transmission can be regarded as a "virtual connection". "Virtual connection" means that there is no Bluetooth Low Energy (BLE) standard between the slave device and the master device. The connection exists in the data communication channel as defined in , but by multiplexing the broadcast channel between the master and slave devices, the master device can obtain the payload data of the slave device in real time, and establish a standard connection at any time when needed.

Step 105: Send the second type of broadcast to the master device.

Specifically, the slave device sends the second type of broadcast to the master device according to the received virtual connection parameters. Among them, because the virtual connection parameters may include: a transmission period (ie, the second type of broadcast period) and a transmission channel (ie, the broadcast channel of the virtual connection). The slave device sends the second type of broadcast on the transmission channel with the transmission period, and the random delay (advDelay) in the broadcast period is fixed to "0".

More specifically, the second type of broadcast, as shown in FIG. 9 , includes a payload 901 to be transmitted, a master device address 801 and a slave device address 701 . For example, if the existing slave device A, master device B, and the second type of broadcast cycle is 125ms, the slave device A sends the second type of broadcast to the master device every 125ms.

It is worth mentioning that the payload in the second type of broadcast may be a payload encrypted with a target key, wherein the target key is generated according to the pre-stored slave key and the master key in the virtual connection parameters. Furthermore, the generation rules can be pre-agreed by the master and slave devices. The target key is generated by the respective keys of the master and slave devices, and the payload in the second type of broadcast is encrypted by the target key, which enhances the security of payload transmission.

In addition, the slave device may determine whether to perform the pairing process (step 101 and step 104 ) or the data transmission process (step 105 ) according to the user's instruction.

It should be noted that after the slave device sends the second type of broadcast, it can choose not to monitor the response data of the master device to reduce the power consumption of the BLE device. After the master device is disconnected from the slave device, it resumes the monitoring of the broadcast channel (Scanning). After receiving the broadcast containing the payload from the slave device, on the one hand, it is calculated according to the second type of broadcast cycle in the "virtual connection" parameter. The next time the payload of the slave device is sent, so as to obtain a new payload in time and restore the traditional connection channel when needed. On the other hand, the payload data packet is parsed according to the previously saved target key.

One slave device can also communicate with multiple master devices. After the slave device establishes a virtual connection with multiple master devices, the user can use the software to freely select the paired master device for data communication; the user can also directly choose to communicate with the master device. Connect the paired master device for data communication.

It is worth mentioning that there can also be multiple slave devices that can send the second type of broadcast to the master device address. The number of slave devices is not limited. For example, there are 2 slave devices, which are slave device No. 1 and No. 2 respectively. , and the master device A, the slave device No. 1 and the slave device No. 2 send the second type of broadcast to the master device A on the broadcast channel No. 1, the sending time of the slave device No. 1 is 1.25ms, and the sending time of the slave device No. 2 is 1.1ms, if the broadcast interval of the payload in the second type of broadcast is 150ms, the number of slave devices can exceed 100, and in practice, the number of slave devices can be at least 30.

The data transmission method based on low-power bluetooth in this embodiment is described based on the slave device. From the overall system, the data transmission interaction process between a slave device and the master device is shown in Figure 2:

The slave device sends the first type of broadcast on the three broadcast channels defined by the Bluetooth Low Energy (BLE) standard, such as S21 in Figure 2, to send the first type of broadcast; the first type of broadcast may include the name of the device, and may also include The slave device address, service type, the first type of broadcast period and the slave device key; the slave device key can be a random key; the slave device key in the first type of broadcast sent by the slave device every cycle is regenerated, such as S22 in Figure 2, generate and update the slave device key; the slave device sends the first type of broadcast again, such as S23 in Figure 2, sends the first type of broadcast; the master device listens to the first type of broadcast sent by the slave device, according to The name of the slave device in the first type of broadcast sends a connection request to the slave device, and the connection request includes the address of the master device, as shown in S24 in Figure 2, sends a connection request; the master device generates the master device key after sending the connection request and transmits Period, as shown in S25 in Figure 2; the slave device receives the connection request from the master device, and the slave device receives the virtual connection parameters sent by the master device on the channel set by the connection request according to the connection request, wherein the virtual connection parameters include: the master device The address, the slave device address, the second type of broadcast period, the master device key and the broadcast channel of the virtual connection, such as S26 in Figure 2, send the virtual connection parameters. The slave device confirms that the pairing is successful according to the received virtual connection parameters, as shown in S27 in Figure 2, and sends the confirmation of the virtual connection parameters; the slave device records the master device address, slave device key, transmission channel, and after the second type of broadcast period , immediately disconnect the actual connection with the master device, as shown in S28 in Figure 2, save the virtual connection parameters, and disconnect; the slave device uses the saved slave device key and the received master device key to generate the target key and use The target key encrypts the payload in the second type of broadcast, as shown in S29 in Figure 2, encrypts the payload; the slave device sends the second type of broadcast at the saved second type of cycle, such as S30 in Figure 2, sends the second type of broadcast Class broadcast; the master device uses the saved slave device key and master device key to generate a target key and uses the target key to decrypt the payload in the second type of broadcast, such as S31 in Figure 2, to decrypt the payload.

Compared with the prior art, in the data transmission method based on low-power bluetooth provided by this embodiment, when multiple slave devices communicate with the master device, the slave device transmits the payload with the master device by sending a timed broadcast. , the master and slave devices only need to establish a short-term connection, and the master device does not need to communicate with the slave device through polling, so it is not limited by the communication between a master device and a limited number of slave devices in the Bluetooth Low Energy (BLE) protocol. A master device can communicate with multiple slave devices at the same time, which directly expands the number of slave devices that the master device can communicate with. In the above process, the master and slave devices have only a short-term connection, and then the transmission of the payload can be regarded as a virtual connection, so that the BLE device does not need to maintain a dedicated communication channel connection for data transmission, which reduces the power consumption of the BLE device. At the same time, the slave device Transmission of data through the second type of broadcast makes the response speed of data communication fast, reduces the communication delay, and stabilizes communication; and the broadcast communication method is suitable for all devices that comply with the Bluetooth Low Energy (BLE) protocol, reducing the need for equipment. cost of improvement.

The second embodiment of the present invention relates to a data transmission method based on low-power bluetooth, and the method is mainly applied to a master device in low-power bluetooth data transmission. The specific process is shown in Figure 3, including:

Step 301: The master device receives the first type of broadcast from the slave device.

Specifically, the first type of broadcast may contain the slave device name. The master device monitors broadcast data on one or several broadcast channels defined by the Bluetooth Low Energy (BLE) standard. When the slave device sends a broadcast on the broadcast channel monitored by the master device, the master device can receive the first broadcast data sent by the slave device. One type of broadcast, and the information in the first type of broadcast can be obtained.

It should be noted that the first type of broadcast can be sent by multiple slave devices, and the master device monitors the first type of broadcast on one or more fixed channels. As long as the wireless channels do not conflict, the master device can receive multiple slave devices. The first type of broadcast, in which the number of slave devices is not limited.

Step 302: Send a connection request and virtual connection parameters to the slave device according to the name of the slave device.

Specifically, after receiving the first type of broadcast, the master device can determine the slave device that initiates the connection according to the requirements and the name of the slave device in the first type of broadcast, and initiate a connection request to the slave device. For example, a master device A , 3 slave devices, from device No. 1 to No. 3, the slave device name of slave device No. 1 is: slave device B, the slave device name of slave device No. 2 is: slave device C, the slave device of slave device No. 3 The name is: slave device D. Now the master device has received the first type of broadcast sent by 3 slave devices. The name of the device to be paired is: the device name of slave device A. The master device A searches for the slave device in the first type of broadcast according to Name, according to the name, the paired slave device is determined as slave device No. 1, and a connection request is sent to slave device No. 1. The connection request includes the address of the master device, and the slave device establishes a communication connection with the master device according to the connection request. When the communication connection is established, the master device sends virtual connection parameters to the slave device. The paired parameters include: master device address, The slave device address, the second type of broadcast cycle, the master device key and the broadcast channel of the virtual connection; the slave device confirms that the pairing is successful according to the received parameters, and the slave device saves the master device's address, the second type of broadcast cycle, and the connected broadcast channel. and the master key, then disconnect the slave from the actual connection to the master.

More specifically, the virtual connection parameters include a transmission period (ie, the transmission period of the second type of broadcast) and the transmission channel (the transmission channel of the second type of broadcast).

It should be noted that the master device and the slave device establish a short-lived actual connection, and the process after the pairing is completed is regarded as a virtual connection in this embodiment.

Step 303: Receive the second type of broadcast from the slave device.

Specifically, after receiving the confirmation for the virtual connection parameter from the slave device, the second type of broadcast from the slave device is received according to the virtual connection parameter. After receiving the determination of the virtual connection parameters, the master device can determine that the connection has been established, and then receives the second type of broadcast according to the transmission period and the transmission channel.

The master device will know the time to receive the second type of broadcast according to the saved second type of broadcast cycle, and the master device can only work during the second type of broadcast cycle to receive the second type of broadcast. After the pairing is completed, the slave device sends the second type of broadcast to the master device in the second type of broadcast cycle according to the stored master device address information, wherein the second type of broadcast includes a payload, and the payload is the data to be transmitted.

Step 304: Parse the payload from the second type of broadcast.

Specifically, the master device can parse out the payload according to the second type of broadcast format.

It is worth mentioning that, in order to ensure the security of data transmission, the payload in this embodiment is encrypted by the slave device using the target key before sending, so correspondingly, the master device needs to use the target key to decrypt the second type. The payload in the broadcast. Wherein, the target key is generated according to the pre-generated master device key and the slave device key.

Compared with the prior art, in the data transmission method based on low-power bluetooth provided by this embodiment, when multiple slave devices communicate with the master device, the slave device transmits the payload with the master device by sending a timed broadcast. , the master and slave devices only need to establish a short-term connection, and the master device does not need to communicate with the slave device through polling, so it is not limited by the communication between a master device and a limited number of slave devices in the Bluetooth Low Energy (BLE) protocol. A master device can communicate with multiple slave devices at the same time, which directly expands the number of slave devices that the master device can communicate with. In the above process, the master and slave devices have only a short-term connection, and then the transmission of the payload can be regarded as a virtual connection, so that the BLE device does not need to maintain a dedicated communication channel connection for data transmission, which reduces the power consumption of the BLE device. At the same time, the slave device Transmission of data through the second type of broadcast makes the response speed of data communication fast, reduces the communication delay, and stabilizes communication; and the broadcast communication method is suitable for all devices that comply with the Bluetooth Low Energy (BLE) protocol, reducing the need for equipment. cost of improvement.

A third embodiment of the present invention relates to a slave device. Specifically, as shown in FIG. 4 , it includes, but is not limited to, a first sending module 41 , a first receiving module 42 and a disconnecting module 43 .

The first sending module 41 is used for sending the first type of broadcast. It is further configured to send a second type of broadcast to the master device according to the virtual connection parameter, where the second type of broadcast includes the payload to be transmitted.

The first receiving module 42 is configured to respectively receive the connection request and the virtual connection parameter from the master device.

The disconnecting module 43 is used to disconnect the connection with the main device.

Specifically, the first sending module 41 in the slave device 4 sends the first type of broadcast on the broadcast channel defined by the Bluetooth Low Energy (BLE) standard at a certain period, and the first type of broadcast may include: the name of the slave device , the first type of broadcast cycle and slave device address information. After the master device receives the first broadcast, the master device will send a connection request to the slave device 4 according to the device name of the slave device 4, and the first receiving module 42 in the slave device 4 receives the connection request from the master device, wherein the connection request contains the address information of the master device and the frequency hopping parameter; the pairing module 43 establishes a connection according to the frequency hopping parameter in the connection request, and at the same time, the slave device 4 receives the pairing parameter, that is, the virtual connection parameter, in the data channel for establishing the connection, and the pairing module 43 receives The pairing parameters sent to the master device, the pairing parameters include the master device address, the slave device address, the second type of broadcast period, the master device key and the broadcast channel of the virtual connection; after the pairing module 43 successfully receives the virtual connection parameters, it confirms Pairing is successful. The recording module 44 records the address information of the master device, and also records the information in the first type of broadcast sent by the slave device 4 for the last time, for example, the key of the slave device. After the recording module 44 completes the address recording of the master device, the pairing module 43 will disconnect the connection between the slave device 4 and the master device, and the first sending module 41 in the slave device 4 will use the second type recorded in the recording module 44 In the broadcast period, the second type of broadcast is sent to the master device address recorded by the recording module 44, wherein the second type of broadcast includes the payload to be transmitted.

It should be noted that the first type of broadcast may also include a slave device key, and the slave device key may be a random key generated by using a random number. It should be noted that, the payload sent by the first sending module 41 is a payload encrypted with a target key, and the target key is generated according to the pre-stored slave key and the master key.

The first type of broadcast can include: the name of the slave device, the first type of broadcast period and the slave device key, where the number of the first type of broadcast is greater than 1, and the slave device key in the first type of broadcast sent at least 2 times different. That is to say, a random number can be used to generate the key of the slave device every other cycle, the first sending module 41 in the slave device 4 sends the first type of broadcast at a certain cycle, and the master device is listening to the data sent by the slave device 4. After the first type of broadcast, a connection request is initiated to the slave device 4, and the first receiving module 42 in the slave device 4 receives the connection request from the master device, wherein the connection request can include the address information and frequency hopping parameters of the master device; The pairing module 43 establishes a connection according to the frequency hopping parameter in the connection request, and the recording module 44 records the address information of the master device, and also records the information in the first type of broadcast sent by the slave device 4 last time, such as the slave device key. After the recording module 44 completes the address recording of the master device, the pairing module 43 will disconnect the connection between the slave device 4 and the master device, and the first sending module 41 in the slave device 4 uses the target key to pair the The payload to be transmitted is encrypted, and after the encryption is completed, the first sending module 41 will send the second-type broadcast to the master device at the second-type period.

Compared with the prior art, in the slave device provided in this embodiment, when multiple slave devices communicate with the master device, the slave device transmits the payload with the master device by sending a timed broadcast. To establish a short-term connection, the master device does not need to communicate with the slave device through polling, so it is not limited by the communication between a master device and a limited number of slave devices in the Bluetooth Low Energy (BLE) protocol, so that a master device can communicate with the slave device at the same time. Communication with multiple slave devices directly expands the number of slave devices that the master device can communicate with. In the above process, the master and slave devices have only a short-term connection, and then the transmission of the payload can be regarded as a virtual connection, so that the BLE device does not need to maintain a dedicated communication channel connection for data transmission, which reduces the power consumption of the BLE device. At the same time, the slave device Transmission of data through the second type of broadcast makes the response speed of data communication fast, reduces the communication delay, and stabilizes communication; and the broadcast communication method is suitable for all devices that comply with the Bluetooth Low Energy (BLE) protocol, reducing the need for equipment. cost of improvement.

It is not difficult to find that this embodiment is a device example corresponding to the first embodiment, and this embodiment can be implemented in cooperation with the first embodiment. The relevant technical details mentioned in the first embodiment are still valid in this embodiment, and are not repeated here in order to reduce repetition. Correspondingly, the related technical details mentioned in this embodiment can also be applied to the first embodiment.

A fourth embodiment of the present invention relates to a master device. Specifically, as shown in FIG. 5 a , it includes, but is not limited to, a second receiving module 61 , a second sending module 62 and a processing module 63 .

The second receiving module 61 is configured to receive the first type of broadcast from the slave device. The method is further configured to receive the second type of broadcast from the slave device according to the virtual connection parameter after receiving the confirmation for the virtual connection parameter from the slave device.

The second sending module 62 is configured to send a connection request and virtual connection parameters to the slave device according to the name of the slave device.

The processing module 63 is configured to parse out the payload from the second type of broadcast.

Specifically, the second receiving module 61 in the master device 6 monitors the first type of broadcast from the slave device on one or several broadcast channels defined by the Bluetooth Low Energy (BLE) standard on the master device. Including: slave device name, first type of broadcast period, among which, the number of slave devices is not limited. After the second receiving module 61 receives the first type of broadcast, the second sending module 62 obtains the address information of the slave device according to the name of the slave device, and sends a connection request to the slave device of the address information, where the connection request includes the address information of the master device , after the slave device receives the connection request, completes the reception of virtual connection parameters, saves the address information of the master device, the slave device disconnects the connection with the device 6, and the slave device sends the second type of broadcast to the master device 6. The second receiving module receives the second type of broadcast from the slave device, wherein the second type of broadcast includes the payload to be transmitted, and the processing module 63 parses the payload according to the second type of broadcast format.

It should be noted that the first type of broadcast may also include a slave device key, and the slave device key may be a random slave device key generated by using a random number. The master device in this embodiment may also be shown in FIG. 5 b , in addition to the modules in FIG. 5 a , the processing module 63 includes: a decryption sub-module 631 .

The decryption sub-module 631 is configured to decrypt the parsed payload using a target key, where the target key is generated according to the pre-stored master key and the slave key.

The first type of broadcast may include: the slave device name, the first type of broadcast period and the slave device key. The slave device key can be generated every other cycle by using a random number, and the second receiving module 61 in the master device 6 receives the first type of broadcast from the slave device on one or more Bluetooth Low Energy (BLE) broadcast channels. , the second receiving module 61 in the master device 6 receives the first type of broadcast and saves the slave device address and the slave device key in the first type of broadcast, and the second sending module 62 obtains the slave device address according to the slave device name information, send a connection request to the slave device of the address information, and the connection request contains the address information of the master device. After the slave device successfully receives the virtual connection parameters, the slave device sends the second type of broadcast to the master device 6. The second receiving module receives the second type of broadcast from the slave device, wherein the second type of broadcast includes the payload to be transmitted, and the processing module 63 uses the target key to decrypt the payload in the second type of broadcast.

Compared with the prior art, when the master device and the slave device provided in this embodiment communicate with each other, when multiple slave devices communicate with the master device, the slave device uses the method of sending timed broadcasts to communicate with the master device. For transmission, only a short-term connection needs to be established between the master and slave devices, and the master device does not need to communicate with the slave device through polling, so it is not limited by the communication between a master device and a limited number of slave devices in the Bluetooth Low Energy (BLE) protocol. , so that a master device can communicate with multiple slave devices at the same time, which directly expands the number of slave devices that the master device can communicate with. In the above process, the master and slave devices have only a short-term connection, and then the transmission of the payload can be regarded as a virtual connection, so that the BLE device does not need to maintain a dedicated communication channel connection for data transmission, which reduces the power consumption of the BLE device. At the same time, the slave device Transmission of data through the second type of broadcast makes the response speed of data communication fast, reduces the communication delay, and stabilizes communication; and the broadcast communication method is suitable for all devices that comply with the Bluetooth Low Energy (BLE) protocol, reducing the need for equipment. cost of improvement.

It is not difficult to find that this embodiment is a device example corresponding to the second embodiment, and this embodiment can be implemented in cooperation with the second embodiment. The related technical details mentioned in the second embodiment are still valid in this embodiment, and are not repeated here in order to reduce repetition. Correspondingly, the related technical details mentioned in this embodiment can also be applied to the second embodiment.

The fifth embodiment of the present invention relates to a data transmission system based on Bluetooth low energy consumption, including a slave device as mentioned in the third embodiment, and a master device as mentioned in the fourth embodiment, in the system There is no limit to the number of slave devices, and there is at least one master device.

As shown in FIG. 6 , in this embodiment, five slave devices (respectively, BLE device 2, BLE device 3, BLE device 4, and BLE device 5) and one master device (BLE device 1) are used as examples for description. .

In this system, BLE device 2 sends the first type of broadcast on the three broadcast channels defined by the Bluetooth Low Energy (BLE) standard, BLE device 1 receives the first type of broadcast sent from BLE device 2, and BLE device 1 can also The second type of broadcast sent by the successfully paired BLE device 6 is received on a specific broadcast channel, wherein the interaction time between BLE device 1 and BLE device 2 does not overlap with the interaction time between BLE device 1 and BLE device 6 .

When BLE device 1 receives the broadcast information from BLE device 2 and BLE device 6, BLE device 1 can also initiate a connection request to BLE device 3 on the broadcast channel, where the connection request includes the address information of BLE device 1; Send virtual connection parameters with the BLE device 4 that has established an actual connection, where the virtual connection parameters can include the address of the BLE device 1, the address of the BLE device 4, the second type of broadcast period, the master key of the BLE device 1 and the virtual The connected broadcast channel. The interaction time between BLE device 1 and BLE device 3 does not overlap with the interaction time between BLE device 1 and BLE device 4.

BLE device 1 and BLE device 5 are in a virtual connection state. At this time, BLE device 5 can send the second type of broadcast to BLE device 1, or it can not send the second type of broadcast. When data transmission is required, BLE device 2 Data can be sent directly through the specified broadcast channel.

It should be noted that, in a data transmission system based on Bluetooth low energy consumption, one slave device can also communicate with multiple master devices.

It is worth mentioning that each module involved in this embodiment is a logical module. In practical applications, a logical unit may be a physical unit, a part of a physical unit, or multiple physical units. A composite implementation of the unit. In addition, in order to highlight the innovative part of the present invention, this embodiment does not introduce units that are not closely related to solving the technical problem proposed by the present invention, but this does not mean that there are no other units in this embodiment.

Those skilled in the art can understand that all or part of the steps in the method of the above embodiments can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium and includes several instructions to make a device (which may be a single-chip microcomputer) , chip, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, removable hard disk, Read-Only Memory (ROM, Read-Only Memory), Random Access Memory (RAM, Random Access Memory), magnetic disk or optical disk and other media that can store program codes.

Those skilled in the art can understand that the above-mentioned embodiments are specific examples for realizing the present invention, and in practical applications, various changes in form and details can be made without departing from the spirit and the spirit of the present invention. scope.

Claims (9)

1. a data transmission method based on low-power bluetooth, is characterized in that, comprises: The slave device sends the first type of broadcast, and the first type of broadcast includes: the name of the slave device; Respectively receive a connection request and a virtual connection parameter from the master device, and implement a paired connection with the master device, wherein the virtual connection parameter includes: a transmission period and a transmission channel; disconnecting from the master device; According to the virtual connection parameter, a second type of broadcast is sent to the master device, where the second type of broadcast includes a payload, and the payload is data to be transmitted. 2. The data transmission method based on low-power bluetooth according to claim 1, wherein the virtual connection parameter comprises: a master device key; The payload sent to the master device is a payload encrypted with a target key, and the target key is generated according to a pre-stored slave device key and the master device key. 3. a data transmission method based on low-power bluetooth, is characterized in that, comprises: The master device receives the first type of broadcast from the slave device, and the first type of broadcast includes: the name of the slave device; According to the name of the slave device, send a connection request and virtual connection parameters to the slave device, wherein the virtual connection parameters include: a transmission period and a transmission channel; After receiving the confirmation for the virtual connection parameter from the slave device, receive the second type of broadcast from the slave device according to the virtual connection parameter; A payload is parsed from the second type of broadcast, and the payload is the data to be transmitted. 4. The data transmission method based on low-power bluetooth according to claim 3, wherein the first type of broadcast further comprises: a slave device key; Parsing the payload from the second type of broadcast specifically includes: decrypting the parsed payload with a target key, the target key based on the pre-generated master key and the slave key key generation. 5. A slave device, characterized in that, comprising: a first sending module, configured to send a first type of broadcast, where the first type of broadcast includes: a slave device name; a first receiving module, configured to respectively receive a connection request and a virtual connection parameter from a master device, and implement a paired connection with the master device, wherein the virtual connection parameter includes: a transmission period and a transmission channel; A disconnecting module for disconnecting the main device; The first sending module is further configured to send a second type of broadcast to the master device according to the virtual connection parameter, where the second type of broadcast includes a payload, and the payload is data to be transmitted. 6. The slave device according to claim 5, wherein the virtual connection parameter comprises: a master device key; The payload sent by the first sending module is a payload encrypted with a target key, and the target key is generated according to a pre-stored slave key and the master key. 7. A main device, characterized in that, comprising: The second receiving module is configured to receive the first type of broadcast from the slave device, where the first type of broadcast includes: the name of the slave device; A second sending module, configured to send a connection request and virtual connection parameters to the slave device according to the slave device name, wherein the virtual connection parameters include: a transmission period and a transmission channel; The second receiving module is further configured to receive the second type of broadcast from the slave device according to the virtual connection parameter after receiving the confirmation for the virtual connection parameter from the slave device; A processing module, configured to parse out a payload from the second type of broadcast, where the payload is data to be transmitted. 8. The master device according to claim 7, wherein the first type of broadcast further comprises: a slave device key; The processing module specifically includes: a decryption sub-module for decrypting the parsed payload by using a target key, where the target key is generated according to the pre-stored master key and the slave key. 9 . A data transmission system based on Bluetooth low energy consumption, comprising: a slave device as claimed in claim 5 or 6 , and a master device as claimed in claim 7 or 8 .

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