CN104811895B - Connection method and device of low-power-consumption Bluetooth - Google Patents

Abstract

The invention discloses a connection method of low-power-consumption Bluetooth, which comprises the conversion of a master device and a slave device; the conversion of the master device and the slave device includes: a. acquiring a master time slice with random length, and using a low-power-consumption Bluetooth protocol to scan slave equipment as master equipment; determining that no connection is established with the slave device within a master time slice of random length; acquiring slave time slices with random lengths, and sending out a Bluetooth broadcast signal by using a low-power Bluetooth protocol as slave equipment; and c, determining that the connection with the master device is not established in the slave time slices with random lengths, and returning to the step a. The equipment is used as the master equipment and the slave equipment in turn in an automatic random time slice mode, the situation that a plurality of pieces of equipment cannot be scanned by the master equipment or the slave equipment at the same time is avoided, the time slice length is generated randomly, connection is established when the equipment circulates to be in different master-slave modes, the connection is more convenient, the complexity of user operation is simplified, and the user experience is improved.

Description

A connection method and device for low-power bluetooth

technical field

The invention relates to low-power bluetooth technology for wireless communication, in particular to a connection method and device for low-power bluetooth.

Background technique

Bluetooth low energy consumption is mainly used to realize the continuous connection between mobile smart terminals or between mobile smart terminals and peripheral accessories. It is a short-range wireless communication technology with extremely low power consumption, and the effective transmission distance has been increased to 100 meters. Above, however, the master-slave relationship needs to be established during the Bluetooth connection process. The slave device turns on the Bluetooth broadcast signal, and the master device scans the broadcast signal to start the connection. Therefore, before the Bluetooth application, the master-slave relationship between the two must be established before the connection can be carried out. If Both become the master device or the slave device, then the two parties cannot search for each other, and cannot make the next connection request. However, if the two parties have the same subject, such as two watches, before establishing a Bluetooth connection, the user must also select the master-slave relationship of the Bluetooth connection. One more step of confirmation in the interaction will add technical obstacles to users who do not understand technology.

Contents of the invention

Embodiments of the present invention provide a low-power Bluetooth connection method and device, which do not need to manually select the master-slave relationship of the device, which makes the connection more convenient, simplifies the complexity of user operations, and improves user experience.

Embodiments of the present invention adopt the following technical solutions:

In the first aspect, the technical solution provides a low-power Bluetooth connection method, including the conversion of the master device and the slave device;

Master and slave transitions include:

a. Obtain a random length of the main time slice, as the master device scans the slave device using the Bluetooth low energy protocol; determine that there is no connection with the slave device within the random length of the main time slice; obtain a random length of the slave time slice, as a slave device Use the Bluetooth low energy protocol to send out a Bluetooth broadcast signal; determine that there is no connection with the master device within the random length of the slave time slice, and return to step a; or,

c. Obtain a slave time slice of random length as a slave device to send a Bluetooth broadcast signal using the Bluetooth low energy protocol; determine that no connection is established with the master device within the slave time slice of random length; obtain a master time slice of random length as the master The device scans the slave device using the Bluetooth low energy protocol; it is determined that no connection is established with the slave device within the random length of the master time slice, and returns to step c.

Its further technical solution is that after acquiring the master time slice of random length, as the master device scans the slave device using the Bluetooth low energy protocol, it also includes:

After determining that the connection between the master device and the slave device is established and interrupted, a slave time slice of random length is obtained, and the slave device sends out a Bluetooth broadcast signal using the Bluetooth low energy protocol; or,

After it is determined that the connection between the master device and the slave device is established and interrupted, a random length of the master time slice is obtained, and the master device scans the slave device using the Bluetooth low energy protocol.

Its further technical solution is that after the acquisition of the slave time slice of random length, as the slave device sends out the Bluetooth broadcast signal using the Bluetooth low energy protocol, it also includes:

After it is determined that the connection between the slave device and the master device is established and interrupted, a random length of the master time slice is obtained, and the master device scans the slave device using the Bluetooth low energy protocol; or,

After it is determined that the connection between the slave device and the master device is established and interrupted, a slave time slice of random length is obtained, and the slave device uses the Bluetooth low energy protocol to send out a Bluetooth broadcast signal.

Its further technical solution is that after acquiring the master time slice of random length, as the master device scans the slave device using the Bluetooth low energy protocol, it also includes:

If at least two slave devices are detected, sort the Bluetooth signal strengths of the slave devices, and connect according to the Bluetooth signal strength from strong to weak.

Its further technical solution is that both the master time slice of random length and the slave time slice of random length are random time slices obtained by the formula T2=((Rand()%N)+1)*T1, wherein T1 is The minimum time unit for the Bluetooth low energy device switching, N is an integer greater than 1 and less than 20.

In the second aspect, the technical solution provides a low-power Bluetooth connection device, including:

The main time slice acquisition unit is used to obtain a random length of the main time slice, as the master device uses the Bluetooth low energy protocol to scan the slave device;

The first connection determining unit is used to determine that no connection is established with the slave device within the master time slice of random length;

The first trigger unit is used to trigger the slave time slice acquisition unit when no connection is established with the slave device within the random length of the master time slice;

The slave time slice acquisition unit is used to acquire a slave time slice of random length, as a slave device using a Bluetooth low energy protocol to send a Bluetooth broadcast signal;

The second connection confirmation unit is used to determine that no connection is established with the master device within the slave time slice of random length;

The second triggering unit is configured to trigger the master time slice acquiring unit when no connection is established with the master device within a slave time slice of random length.

Its further technical scheme is, also includes:

The first connection interruption unit is used to determine that the connection between the master device and the slave device is interrupted, then obtain a slave time slice of random length, and send a Bluetooth broadcast signal as a slave device using the Bluetooth low-power protocol; After the master device establishes a connection with the slave device and is interrupted, it obtains a random length of the master time slice, and uses the low-power bluetooth protocol as the master device to scan the slave device.

Its further technical scheme is, also includes:

The second connection interruption unit is used to determine that the connection between the slave device and the master device is interrupted, then obtain a random length of the master time slice, and use the low-power bluetooth protocol as the master device to scan the slave device; After the device establishes a connection with the master device and interrupts it, it will obtain a slave time slice of random length, and use the Bluetooth low energy protocol as a slave device to send out a Bluetooth broadcast signal.

Its further technical scheme is, also includes:

The signal strength connection unit is used to sort the bluetooth signal strengths of the slave devices if at least two slave devices are detected, and connect according to the bluetooth signal strength from strong to weak.

Its further technical solution is a random time acquisition unit, which is used to obtain the master time slice of random length and the slave time slice of random length by the formula T2=((Rand()%N)+1)*T1, wherein, T1 It is the minimum time unit for switching between Bluetooth low energy devices, and N is an integer greater than 1 and less than 20.

Beneficial effects brought by the technical solutions provided by the embodiments of the present invention:

In this technical solution, the device is made to take turns as the master device and the slave device by means of automatic random time slices, so as to avoid multiple devices being master devices or slave devices at the same time and not being able to find the other party to establish a connection. The length of the time slice is randomly generated. When the device When looping to different master-slave modes, a connection is established, which makes the connection more convenient, simplifies the complexity of user operations, and improves the user experience.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments of the present invention. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention , for those skilled in the art, other drawings can also be obtained according to the content of the embodiment of the present invention and these drawings without any creative effort.

Fig. 1 is a method flow chart of the first embodiment of the Bluetooth low energy connection method provided by the embodiment of the present invention.

Fig. 2 is a method flow chart of the second embodiment of the Bluetooth low energy connection method provided by the embodiment of the present invention.

Fig. 3 is a method flow chart of the third embodiment of the Bluetooth low energy connection method provided by the embodiment of the present invention.

Fig. 4 is a method flow chart of the fourth embodiment of the Bluetooth low energy connection method provided by the embodiment of the present invention.

Fig. 5 is a method flow chart of the fifth embodiment of the Bluetooth low energy connection method provided by the embodiment of the present invention.

Fig. 6 is a method flowchart of the sixth embodiment of the Bluetooth low energy connection method provided by the embodiment of the present invention.

FIG. 7 is a structural diagram of a first embodiment of a Bluetooth low energy connection device provided by an embodiment of the present invention.

Detailed ways

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only the technical solutions of the present invention. Some, but not all, embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making creative efforts belong to the protection scope of the present invention.

Please refer to FIG. 1 , which is a method flowchart of the first embodiment of the Bluetooth low energy connection method provided by the embodiment of the present invention. The Bluetooth low energy connection methods include:

S100. Obtain a master time slice of a random length, and use the Bluetooth low energy protocol as the master device to scan the slave device.

The main time slice of random length is obtained by the formula T2=((Rand()%N)+1)*T1, wherein T1 is the minimum time unit for Bluetooth low energy device switching, and N is an integer greater than 1 and less than 20. In this embodiment, N is preferably 10.

The master time slice of random length is relatively short, but the length of time is at least the time required to allow the slave device to receive connection request information from other master devices, and the time required for the master device to search for other slave devices, usually at this time Extend a certain period of time on the basis to ensure that the two parties continue to establish a connection in a state where one is the master device and the other is the slave device after a few random times.

S101. Determine that no connection is established with the slave device within the master time slice of random length.

If the bluetooth signal of the slave device is not scanned within the main time slice of random length, or if the scanned bluetooth signal is lower than the set value, no connection is made.

S102. Obtain a slave time slice of a random length, and use the Bluetooth low energy protocol as a slave device to send out a Bluetooth broadcast signal.

The random-length slave time slice is obtained in the same way as the random-length master time slice, and will not be repeated here. Since the slave time slice of random length and the master time slice of random length are random within a certain range, the length of the time slice is not a fixed value, and the device is converted from the master state to the slave state.

S103. Determine that no connection is established with the master device within the slave time slice of random length, and return to step S100.

If the device is in the slave state and there is no master device to establish a connection with it, it will scan again as the master device, and thus cycle between the master device state and the slave device state until multiple devices are not master devices or slave devices at the same time. until connected. Usually after 1-3 cycles, the connection can be established automatically.

To sum up, in this embodiment, after the Bluetooth function is turned on, the device is in the master device state, and the device will take turns as the master device and the slave device by means of automatic random time slices, so as to avoid multiple devices being the master device or the slave device at the same time and unable to scan The length of the time slice is randomly generated, and the connection is established when the device is in different master-slave modes. The connection is more convenient, the complexity of user operations is simplified, and the user experience is improved.

Please refer to FIG. 2 , which is a method flowchart of the second embodiment of the Bluetooth low energy connection method provided by the embodiment of the present invention. The difference between the connection method of this low-power bluetooth and the method shown in Figure 1 is that the connection method of low-power bluetooth in this embodiment is first in the slave device state at the beginning, and the connection method of low-power bluetooth includes:

S200. Obtain a slave time slice of a random length, and use the Bluetooth low energy protocol as a slave device to send out a Bluetooth broadcast signal.

S201. Determine that no connection is established with the master device within a slave time slice of random length.

S202. Obtain a master time slice of random length, and use the Bluetooth low energy protocol as the master device to scan the slave device.

S203. Determine that no connection is established with the slave device within the random length of the master time slice, and return to step S200.

If the device is in the master device state and does not scan the slave device, or if the scanned Bluetooth signal is lower than the set value and does not connect, it will scan again as a slave device, and thus cycle between the master device state and the slave device state until Multiple devices are not at the same time as the master device or at the same time as the slave device until the connection can be established. Usually after 1-3 cycles, the connection can be established automatically.

For the method of obtaining the slave time slice of random length and the master time slice of random length, refer to the relevant content of the method shown in FIG. 1 , which will not be repeated here.

To sum up, in this embodiment, after the Bluetooth function is turned on, the device is in the slave device state, and the device will take turns as the master device and the slave device by means of automatic random time slices, so as to avoid multiple devices being the master device or the slave device at the same time and unable to scan The length of the time slice is randomly generated, and the connection is established when the device is in different master-slave modes. The connection is more convenient, the complexity of user operations is simplified, and the user experience is improved.

Please refer to FIG. 3 , which is a method flowchart of the third embodiment of the Bluetooth low energy connection method provided by the embodiment of the present invention. The difference between this embodiment and the method shown in FIG. 1 is that, after the connection, the embodiment finds that it is not a target device that needs to be connected, and then processes it.

The Bluetooth low energy connection methods include:

S300. Obtain a master time slice of random length, and use the Bluetooth low energy protocol as the master device to scan the slave device.

S301. After determining that the connection between the master device and the slave device is established and interrupted, obtain a slave time slice of a random length, and send out a Bluetooth broadcast signal as a slave device using the Bluetooth low energy protocol.

When the device is in the state of the master device, it scans the slave device and establishes a connection with it. At this time, the random time slice stops. After the connection, it is confirmed by the identity information that it is not the target device that needs to be connected, and the device enters the slave device state.

When the identity is confirmed after the connection is established, the user can click on the touch screen to confirm, or use a preset action to confirm the identity.

S302. Determine that no connection is established with the master device within the slave time slice of random length, and return to step S300.

To sum up, in this embodiment, after the Bluetooth function is turned on, the device is in the master device state, and the device will take turns as the master device and the slave device by means of automatic random time slices, until multiple devices are in different states and establish a connection, and the connection is determined. If the device is not the target device, the cycle of random time slices will continue, making the connection more convenient, simplifying the complexity of user operations, improving the user experience, and ensuring the accuracy of the connection.

In this embodiment, preferably, when the device is in the master state, if at least two slave devices are detected, the Bluetooth signal strengths of the slave devices are sorted, and the connections are made in order from strong to weak Bluetooth signal strengths. When the connected slave device is not the target device, the Bluetooth signal of the slave device is disconnected and discarded, and the connection is made in order according to the strength of the Bluetooth signal from strong to weak. Make sure that when face-to-face users exchange information, they can connect successfully the first time.

Please refer to FIG. 4 , which is a method flowchart of the fourth embodiment of the Bluetooth low energy connection method provided by the embodiment of the present invention. The difference between this embodiment and the method shown in FIG. 3 is that this embodiment enters the master device state after finding that it is not the target device that needs to be connected after the connection.

The Bluetooth low energy connection methods include:

S400. Obtain a master time slice of random length, and use the Bluetooth low energy protocol as the master device to scan the slave device.

S401. After determining that the connection between the master device and the slave device is interrupted, obtain a master time slice of random length, and use the low-power bluetooth protocol as the master device to scan the slave device.

When the device is in the state of the master device, it scans the slave device and establishes a connection with it. At this time, the random time slice stops. After the connection, it is confirmed by the identity information that it is not the target device that needs to be connected, and the device enters the state of the master device.

When the identity is confirmed after the connection is established, the user can click on the touch screen to confirm, or use a preset action to confirm the identity.

S402. Determine that no connection is established with the slave device within the master time slice of random length.

S403. Obtain a slave time slice of a random length, and use the Bluetooth low energy protocol as a slave device to send out a Bluetooth broadcast signal.

S404. Determine that no connection is established with the master device within the slave time slice of random length, and return to step S400.

To sum up, in this embodiment, after the Bluetooth function is turned on, the device is in the master device state, and the device will take turns as the master device and the slave device by means of automatic random time slices, until multiple devices are in different states and establish a connection, and the connection is determined. If the device is not the target device, the cycle of random time slices will continue, making the connection more convenient, simplifying the complexity of user operations, improving the user experience, and ensuring the accuracy of the connection.

Please refer to FIG. 5 , which is a method flowchart of the fifth embodiment of the Bluetooth low energy connection method provided by the embodiment of the present invention. The difference between this embodiment and the method shown in FIG. 2 is that, after the connection, the present embodiment finds that it is not the target device that needs to be connected, and then processes it.

S500. Obtain a slave time slice of a random length, and send a Bluetooth broadcast signal as a slave device using the Bluetooth low energy protocol.

S501. After determining that the connection between the slave device and the master device is interrupted, obtain a master time slice of random length, and use the Bluetooth low energy protocol as the master device to scan the slave device.

When the device is in the slave device state, it establishes a connection with the master device. At this time, the random time slice stops. After the connection, it is confirmed through the identity information that it is not the target device that needs to be connected, and the device enters the master device state.

When the identity is confirmed after the connection is established, the user can click on the touch screen to confirm, or use a preset action to confirm the identity.

S502. Determine that no connection is established with the slave device within the random length of the master time slice, and return to step S500.

To sum up, in this embodiment, after the Bluetooth function is turned on, the device is in the slave device state, and the device takes turns as the master device and the slave device by means of automatic random time slices, until multiple devices are in different states and establish a connection, and the connection is determined. If the device is not the target device, the cycle of random time slices will continue, making the connection more convenient, simplifying the complexity of user operations, improving the user experience, and ensuring the accuracy of the connection.

Please refer to FIG. 6 , which is a method flowchart of the sixth embodiment of the Bluetooth low energy connection method provided by the embodiment of the present invention. The difference between this embodiment and the method shown in FIG. 5 is that this embodiment enters the slave device state if it finds that it is not the target device to be connected after the connection.

S600. Obtain a slave time slice of a random length, and use the Bluetooth low energy protocol as a slave device to send out a Bluetooth broadcast signal.

S601. After determining that the connection between the slave device and the master device is interrupted, obtain a slave time slice of random length, and use the Bluetooth low energy protocol as the slave device to send out a Bluetooth broadcast signal.

When the device is in the state of the slave device, it establishes a connection with the master device. At this time, the random time slice stops. After the connection, it is confirmed through the identity information that it is not the target device that needs to be connected, and the device enters the state of the slave device.

When the identity is confirmed after the connection is established, the user can click on the touch screen to confirm, or use a preset action to confirm the identity.

S602. Determine that no connection is established with the master device within the slave time slice of random length.

S603. Obtain a master time slice of random length, and use the Bluetooth low energy protocol as the master device to scan the slave device.

S604. Determine that no connection is established with the slave device within the random length of the master time slice, and return to step S600.

To sum up, in this embodiment, after the Bluetooth function is turned on, the device is in the slave device state, and the device takes turns as the master device and the slave device by means of automatic random time slices, until multiple devices are in different states and establish a connection, and the connection is determined. If the device is not the target device, the cycle of random time slices will continue, making the connection more convenient, simplifying the complexity of user operations, improving the user experience, and ensuring the accuracy of the connection.

Please refer to FIG. 7 , which is a flow chart of the method of the first embodiment of the Bluetooth low energy connection device provided by the embodiment of the present invention. The Bluetooth low energy connection device includes:

The main time slice obtaining unit 10 is used to obtain the main time slice of random length, and uses the low power bluetooth protocol as the master device to scan the slave device;

The first connection determination unit 20 is configured to determine that no connection is established with the slave device within the master time slice of random length;

The first trigger unit 30 is used to trigger the slave time slice acquisition unit when no connection is established with the slave device within the master time slice of random length;

From the time slice acquisition unit 40, used to obtain a random length from the time slice, as a slave device using the Bluetooth low power protocol to send a bluetooth broadcast signal;

The second connection confirming unit 50 is used to determine that no connection is established with the master device within the slave time slice of random length;

The second trigger unit 60 is configured to trigger the master time slice acquisition unit when no connection is established with the master device within a slave time slice of random length.

For details of the device, please refer to the method described in FIG. 1 and FIG. 2 , which will not be repeated here.

To sum up, in this embodiment, after the Bluetooth function is turned on, the device will take turns as the master device and the slave device by means of automatic random time slices, so as to prevent multiple devices from being scanned at the same time as the master device or the slave device at the same time, and the length of the time slice is random. Generated, when the device cycles to different master-slave modes, the connection is established, the connection is more convenient, the complexity of user operation is simplified, and the user experience is improved.

In some other embodiments, also include:

The first connection interruption unit is used to determine that the connection between the master device and the slave device is interrupted, then obtain a slave time slice of random length, and send a Bluetooth broadcast signal as a slave device using the Bluetooth low-power protocol; After the master device establishes a connection with the slave device and is interrupted, it obtains a random length of the master time slice, and uses the low-power bluetooth protocol as the master device to scan the slave device.

Specifically, when the method shown in FIG. 3 is used, the first connection interruption unit is used to determine that the connection between the master device and the slave device is established and interrupted, then obtain a slave time slice of random length, and use the Bluetooth low energy protocol as a slave device Send out a Bluetooth broadcast signal.

When using the method shown in Figure 4, the first connection interruption unit is used to determine that the connection between the master device and the slave device is interrupted, then obtain a random length of the master time slice, and use the low-power bluetooth protocol as the master device to scan the slave device . Improved connection accuracy by verifying that the connected device is the intended device.

In some other embodiments, also include:

The second connection interruption unit is used to determine that the connection between the slave device and the master device is interrupted, then obtain a random length of the master time slice, and use the low-power bluetooth protocol as the master device to scan the slave device; After the device establishes a connection with the master device and is interrupted, it obtains a slave time slice of random length, and uses the Bluetooth low energy protocol as a slave device to send out a Bluetooth broadcast signal.

Specifically, when the method shown in FIG. 5 is used, the second connection interruption unit is used to determine that the connection between the slave device and the master device is interrupted, then obtain a random length of the master time slice, and use the Bluetooth low energy protocol as the master device Scan slaves.

When using the method shown in Figure 6, the second connection interruption unit is used to determine that the connection between the slave device and the master device is established and interrupted, then obtain a slave time slice of random length, and send out a Bluetooth broadcast as a slave device using the Bluetooth low energy protocol Signal. Improved connection accuracy by verifying that the connected device is the intended device.

Preferably, it also includes:

The signal strength connection unit is used to sort the bluetooth signal strengths of the slave devices if at least two slave devices are detected, and connect according to the bluetooth signal strength from strong to weak. By connecting with the slave devices in sequence according to the strength of the Bluetooth signal from strong to weak, it is ensured that the connection is realized at one time during face-to-face information exchange, and the connection efficiency is improved.

The random time acquisition unit is used to obtain the master time slice of the random length and the slave time slice of the random length by the formula T2=((Rand()%N)+1)*T1, wherein T1 is a low-power bluetooth device The minimum time unit for switching, N is an integer greater than 1 and less than 20. Both the master time slice of random length and the slave time slice of random length are random time slices.

The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation and application scope. limits.

Claims (6)

1. A connection method of bluetooth low power consumption, is characterized in that, comprises the conversion of main equipment and slave equipment; Master and slave transitions include: a. Obtain a master time slice of random length, and use the Bluetooth low energy protocol as the master device to scan the slave device; After it is determined that the connection between the master device and the slave device is established and interrupted, a random length of the master time slice is obtained, and the slave device is scanned using the Bluetooth low energy protocol as the master device; If it is determined that no connection has been established with the slave device within the master time slice of random length, or if it is determined that the connection between the master device and the slave device is interrupted, then obtain a slave time slice of random length, and use the Bluetooth low energy protocol as a slave device to send out Bluetooth broadcast signal; Determine that there is no connection with the master device within the slave time slice of random length, and return to step a; or, c. Obtain a slave time slice of random length, and send out a Bluetooth broadcast signal as a slave device using the Bluetooth low energy protocol; After it is determined that the connection between the slave device and the master device is established and interrupted, a slave time slice of random length is obtained, and the slave device uses the Bluetooth low energy protocol to send out a Bluetooth broadcast signal; If it is determined that no connection has been established with the master device within the slave time slice of random length, or if the connection between the slave device and the master device is determined to be interrupted, obtain a master time slice of random length, and use the Bluetooth low energy protocol as the master device to scan the slave device. equipment; Determine that no connection is established with the slave device within the random length of the master time slice, and return to step c. 2. The method according to claim 1, wherein said acquisition of the master time slice of random length, after the slave device is scanned using the Bluetooth low energy protocol as the master device, further includes: If at least two slave devices are detected, sort the Bluetooth signal strengths of the slave devices, and connect according to the Bluetooth signal strength from strong to weak. 3. The method according to claim 1 or 2, characterized in that, the random-length master time slice and the random-length slave time slice are both determined by the formula T2=((Rand()%N)+1)* A random time slice obtained by T1, where T1 is the minimum time unit for switching the Bluetooth low energy device, and N is an integer greater than 1 and less than 20. 4. A connection device for bluetooth low power consumption, characterized in that, comprising: The main time slice acquisition unit is used to obtain a random length of the main time slice, as the master device uses the Bluetooth low energy protocol to scan the slave device; The slave time slice acquisition unit is used to acquire a slave time slice of random length, as a slave device using a Bluetooth low energy protocol to send a Bluetooth broadcast signal; The first connection determining unit is used to determine that no connection is established with the slave device within the master time slice of random length; The first trigger unit is used to trigger the slave time slice acquisition unit when no connection is established with the slave device within the random length of the master time slice; The first connection interruption unit is used to determine that the connection between the master device and the slave device is interrupted, and then trigger the slave time acquisition unit, or trigger the master time slice acquisition unit; The second connection confirmation unit is used to determine that no connection is established with the master device within the slave time slice of random length; The second trigger unit is used to trigger the master time slice acquisition unit when no connection is established with the master device within a slave time slice of random length; The second connection interruption unit is used to determine that the connection between the slave device and the master device is interrupted, and then trigger the slave time acquisition unit, or trigger the master time slice acquisition unit. 5. The connection device of Bluetooth Low Energy according to claim 4, further comprising: The signal strength connection unit is used to sort the bluetooth signal strengths of the slave devices if at least two slave devices are detected, and connect according to the bluetooth signal strength from strong to weak. 6. The low-power Bluetooth connection device according to claim 4 or 5, characterized in that the random time acquisition unit is used to acquire the A master time slice with a random length and a slave time slice with a random length, wherein T1 is the minimum time unit for switching a Bluetooth low energy device, and N is an integer greater than 1 and less than 20.