WO2012129848A1

WO2012129848A1 - Method and apparatus for simulating universal serial bus device

Info

Publication number: WO2012129848A1
Application number: PCT/CN2011/075829
Authority: WO
Inventors: 李幸远
Original assignee: 中兴通讯股份有限公司
Priority date: 2011-04-01
Filing date: 2011-06-16
Publication date: 2012-10-04
Also published as: CN102737003A; CN102737003B

Abstract

A method for simulating USB devices is disclosed, used to implement simulation on compound USB device. The said method includes: through the USB interface, a terminal side receives USB device enumeration instructions sent by a personal computer (PC) side; the terminal side queries local device descriptors and configuration descriptors according to the USB device enumeration instructions, wherein the device descriptors and the configuration descriptors are set according to Bluetooth features; the terminal side returns the queried device descriptor and configuration descriptor to the PC side through the USB interface. An apparatus for implementing the said method is also disclosed. According to the technical solution, a simulation on the USB compound device can be realized.

Description

Method and device for simulating universal serial bus device

The present invention relates to the field of communications and computers, and more particularly to a method and apparatus for simulating a universal serial bus device. Background technique

With the rapid development of wireless communication technologies, the third generation of wireless communication network technologies have become more and more popular, and the functions provided by mobile terminals have become more and more diverse. Mobile terminals generally use a USB (Universal Serial Bus) composite device to implement a functional interface. The so-called USB composite device refers to a plurality of USB sub-devices hung under one USB host device, and each USB sub-device uses several USB terminals to communicate with the PC (personal computer) side. Usually, these USB sub-devices include Modem (modulation and demodulation equipment, multiple virtual serial ports, and NDIS (Network Device Interface Specification) network card devices.

However, USB endpoints are hardware resources and their number is limited. The USB protocol stipulates that a USB controller has at most one bidirectional control endpoint and 15 pairs of data transmission endpoints, and the general USB device controller achieves a much lower number of USB endpoints than the maximum number of endpoints for cost reasons. Therefore, the limitation of hardware resources has caused the limitation of the number of USB composite device sub-devices, and the number of USB sub-devices and the function of adding USB sub-devices cannot be further expanded.

In addition, the driver of the USB composite device on the PC side is very complicated, and the mainstream operating system does not support it well. In general, USB composite devices and their sub-device drivers require the development of the USB device provider. The development of USB device drivers is complex and costly, extending the product development cycle. Summary of the invention

Embodiments of the present invention provide a method and apparatus for simulating a USB device, which are used to implement simulation of a USB composite device.

A method for simulating a USB device is applied to a terminal side, and the method includes:

The terminal side receives the USB device enumeration command sent by the PC side of the personal computer through the USB interface; the terminal side queries the local device descriptor and the configuration descriptor according to the USB device enumeration instruction, wherein the device descriptor and the configuration descriptor are based on the Bluetooth feature Set

The terminal side returns the queried device descriptor and configuration descriptor to the PC side through the USB interface. A method of simulating a USB device, applied to a PC side, the method comprising:

The PC sends a USB device enumeration instruction to the terminal side;

The PC side receives the device descriptor and the configuration descriptor returned by the USB device;

The PC side enumerates and recognizes the virtual Bluetooth controller through device descriptors and configuration descriptors.

A terminal device, the terminal device comprising:

An interface module including a USB interface, configured to receive, by using a USB interface, a USB device enumeration instruction sent by a PC side of the personal computer;

a virtual Bluetooth host module, configured to query a local device descriptor and a configuration descriptor according to the USB device enumeration instruction, where the device descriptor and the configuration descriptor are set according to the Bluetooth feature; and, the interface module is instructed to the PC through the USB interface The side returns the queried device descriptor and configuration descriptor.

A computer device, the computer device comprising:

An interface module, configured to send a USB device enumeration instruction to the terminal side; and receive a device descriptor and a configuration descriptor returned by the USB device;

A Bluetooth control module for enumerating and identifying virtual Bluetooth controllers through device descriptors and configuration descriptors. In the embodiment of the present invention, the device descriptor and the configuration descriptor are set in advance according to the Bluetooth feature, so that the PC side recognizes the USB device as a Bluetooth device when enumerating the USB device, and enumerates the Bluetooth device, thereby It realizes the simulation of the USB device with the Bluetooth device, so it can support more USB sub-devices according to the Bluetooth protocol in the subsequent communication, without being limited by the number of USB endpoints. Moreover, since the Bluetooth protocol is used for communication, the Bluetooth driver is loaded, and the USB driver does not need to be loaded, thereby avoiding the problems caused by the USB driver. DRAWINGS

1 is a flowchart of a main method for simulating a USB device on a terminal side according to an embodiment of the present invention; FIG. 2 is a flowchart of a main method for simulating a USB device on a PC side according to an embodiment of the present invention; FIG. 3 is a schematic diagram of a USB emulating USB according to an embodiment of the present invention; Detailed method flow chart of the device;

4 is a flowchart of a method for pairing Bluetooth devices according to an embodiment of the present invention;

FIG. 5 is a flowchart of a method for service discovery according to an embodiment of the present invention;

6 is a main structural diagram of a terminal device according to an embodiment of the present invention;

FIG. 7 is a detailed structural diagram of a terminal device according to an embodiment of the present invention;

FIG. 8 is a structural diagram of a personal computer according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic structural diagram of a virtual bluetooth controller module according to an embodiment of the present invention. detailed description

In the embodiment of the present invention, the device descriptor and the configuration descriptor are set in advance according to the Bluetooth feature, so that the PC side recognizes the USB device as a Bluetooth device when enumerating the USB device, and enumerates the Bluetooth device. Therefore, the USB device is simulated by the Bluetooth device, so the subsequent communication can be based on the Bluetooth protocol, and is not limited by the number of USB terminals, and can support more USB sub-devices. Moreover, since the Bluetooth protocol is used for communication, the Bluetooth driver is loaded, and the USB driver does not need to be loaded, thereby avoiding the problems caused by the USB driver.

As shown in FIG. 1 , the main method of simulating a USB device on the terminal side in this embodiment is as follows: After the terminal side is connected to the PC side through the USB interface, perform the following procedure.

Step 101: The terminal side receives the USB device enumeration instruction sent by the PC side of the personal computer through the USB interface.

Step 102: The terminal side queries the local device descriptor and the configuration descriptor according to the USB device enumeration instruction. The device descriptor and the configuration descriptor are set according to the Bluetooth feature, and the value of the device descriptor and the configuration descriptor are pre-configured. In the terminal side.

Step 103: The terminal side returns the queried device descriptor and the configuration descriptor to the PC side through the USB interface.

After the terminal side sends the device descriptor and the configuration descriptor to the PC side, the PC side can recognize it as a Bluetooth device, and then can communicate through the Bluetooth protocol to implement simulation of the USB device.

As shown in FIG. 2, the main method of simulating a USB device on the PC side in this embodiment is as follows: Step 201: The PC side sends a USB device enumeration instruction to the terminal side.

Step 202: The PC side receives the device descriptor and the configuration descriptor returned by the USB device.

Step 203: The PC side enumerates and identifies the virtual Bluetooth controller by using the device descriptor and the configuration descriptor.

In the prior art, the terminal and the PC communicate with each other through a Bluetooth hardware device. In this embodiment, the USB device is simulated by Bluetooth. Therefore, the virtual Bluetooth-related devices such as the virtual Bluetooth controller are implemented by software.

As shown in FIG. 3, the detailed method for simulating a USB device in this embodiment is as follows:

After the PC side obtains the connection of the USB interface, the following steps are started.

Step 301: The PC side sends a USB device enumeration instruction to the terminal side through the USB interface. Step 302: The terminal side receives the USB type USB device enumeration instruction sent by the PC side through the USB interface.

Step 303: The terminal side returns the enumerated data of the Bluetooth controller class USB device according to the Bluetooth protocol. Step 304: The terminal side queries the local device descriptor and the configuration descriptor according to the USB device enumeration instruction. The device descriptor and configuration descriptor are set according to the Bluetooth feature.

Step 305: The terminal side converts the queried Bluetooth type device descriptor and the configuration descriptor into a USB type device descriptor and a configuration descriptor according to the USB protocol. The configuration descriptor in this embodiment includes a string descriptor, an interface descriptor, and an endpoint descriptor. For example, set the device class field (bDeviceClass) in the device descriptor to OxEO, which means the wireless controller device class; the device subclass field (bDeviceSubClass) is set to 0x01, which means Bluetooth, ultra wideband (UWB, Ultra Wideband) ), Remote RNDIS (Remote NDIS) or Bluetooth AMP controller subclass; Device Protocol field (bDeviceProtocol) is set to 0x01, which means Bluetooth Controller Interface Protocol. Set the interface class field ( blnterfaceClass ) in the interface descriptor under the configuration description to OxEO, which means the wireless controller device class; the interface subclass field ( blnterfaceSubClass ) is set to 0x01 , which means Bluetooth, UWB, Remote RNDIS or Bluetooth AMP controller subclass; interface protocol field (blnterfaceProtocol) is set to 0x01, which means Bluetooth controller interface protocol.

Step 306: The terminal side returns a USB type device descriptor and a configuration descriptor to the PC side through the USB interface.

Step 307: The PC side learns that the terminal side is a Bluetooth device by parsing the device descriptor and the configuration descriptor, and enumerates and identifies the virtual Bluetooth controller. The PC side can also be equipped with a Bluetooth controller device driver for the device.

After the PC device recognizes the Bluetooth device, it can communicate with the terminal side through the Bluetooth protocol. The Bluetooth device pairing and service discovery process are also required. See the following procedure.

Step 308: The PC side sends a pairing request to the terminal side, and completes the pairing process with the terminal side. Step 309: The PC side sends a service discovery request to the terminal side.

Step 310: The terminal side returns a Bluetooth specification identifier supported by the virtual bluetooth host. The Bluetooth specification includes at least DUN (Dial-up Networking), serial port and PAN (Personal Area) Networking, personal office i or network) one of the features.

Step 311: The PC side performs function enumeration according to the DU, the serial port, and the PAN function identifier. That is, the PC side enumerates USB sub-devices such as a Modem port, a virtual serial port, and an NDIS network card device according to the DU identifier, the serial port identifier, and the PAN function identifier.

The PC obtains the detailed information of the virtual Bluetooth host in the terminal side through the pairing process, and enumerates the USB sub-device through the service discovery process. The two processes are described in detail below.

As shown in FIG. 4, the method for pairing Bluetooth devices in this embodiment is as follows:

Step 401: The PC side sends an Inquiry Scan command to the terminal side through an HCI (Host Controller Interface) command. The PC side sends the Inquiry Scan command in a broadcast mode to scan the nearby Bluetooth host. However, in this embodiment, the terminal side is connected to the PC side through the USB interface. Therefore, the terminal side receives the Inquiry Scan command through the USB interface.

Step 402: The terminal side returns to the PC side the MAC carrying the virtual bluetooth host ( (Media

Inquiry Control HCI of the Access Control, Media Access Control) address. Since the Bluetooth host in the terminal side is a Bluetooth host virtualized by software, there is no Bluetooth hardware device, so the MAC address can be a default MAC address pre-configured to the terminal.

Step 403: The terminal side returns an Inquiry Complete HCI event to the PC side.

The scanning process ends. The PC side can further obtain detailed information of the terminal side virtual Bluetooth host, see the following process.

Step 404: The PC side issues a Remote Name Request HCI (remote name request HCI) command, and requests the terminal side to return the detailed information of the Bluetooth host.

Step 405: The terminal side returns a Remote Name Request Complete HCI event with virtual Bluetooth host details. The virtual Bluetooth host details include information such as the host name.

For security reasons, the PC side can also authenticate the virtual Bluetooth host on the terminal side. The process below.

Step 406: The PC side sends the pairing authentication password by using the HCI command.

Step 407: The terminal side returns an HCI event with successful authentication.

Referring to FIG. 5, the method for service discovery in this embodiment is as follows:

Step 501: The PC side issues an ACL (Access Control List) data connection request.

Step 502: The terminal side returns to create a connection successful HCI event, and returns a handle number of the newly created ACL connection.

Step 503: The PC side sends a request for querying the function of the device on the ACL connection.

Step 504: The terminal side returns an identifier of a function supported by the device on the ACL connection. Features include DUN (Dial-up Networking), serial port functionality, and PAN (Personal Area Network) features.

Step 505: The PC side enumerates the USB sub-device according to the function identifier returned by the terminal side. For example, the Modem port, virtual serial port and NDIS network card device are listed.

In this embodiment, the ACL data is transmitted using an endpoint Bulk (body) OUT and a Bulk IN endpoint. The HCI command uses control endpoint transfers. HCI events are transmitted using Interrupt IN endpoints.

Through the above description, the implementation process of simulating a USB device with Bluetooth is understood. The process is mainly implemented by a terminal device and a PC. The internal structure and functions of the two devices are described below.

As shown in FIG. 6, the terminal device in this embodiment includes: an interface module 601 and a virtual Bluetooth host module 602.

The interface module 601 including the USB interface is used for transmitting various data, commands, and events with the PC side, such as receiving a USB device enumeration instruction sent by the PC side of the personal computer through the USB interface.

The virtual Bluetooth host module 602 is configured to query a local device descriptor and a configuration descriptor according to the USB device enumeration instruction, where the device descriptor and the configuration descriptor are set according to the Bluetooth feature; and, the indication interface module transmits the PC to the PC through the USB interface. Side return the queried device descriptor And configuration descriptors. The virtual Bluetooth host module 602 is also used to generate various messages, events, and the like. Specifically, the interface module receives the USB type USB device enumeration instruction sent by the PC side through the USB interface. The terminal device further includes: a virtual bluetooth controller module 603, as shown in FIG. 7, the virtual bluetooth controller module 603 is configured to return the enumerated data of the Bluetooth controller class USB device according to the Bluetooth protocol; and, according to the USB protocol, the query is performed. The Bluetooth type device descriptor and configuration descriptor to be converted to a USB type device descriptor and configuration descriptor. The interface module returns a USB type device descriptor and a configuration descriptor to the PC side through the USB interface.

The interface module 601 is further configured to receive a pairing request sent by the PC side and complete the pairing process with the PC side. Specifically, the interface module 601 receives the query scan Inquiry Scan command sent by the PC side through the HCI command, and returns a query result HCI Inquiry Result HCI event of the media access control MAC address carrying the virtual bluetooth host to the PC side; and returns a query to the PC side. Complete the HCI Inquiry Complete HCI event.

The interface module 601 is further configured to receive a service discovery request sent by the PC side, and return a DUN, a serial port, and a PAN function identifier supported by the virtual Bluetooth host.

In this embodiment, the virtual Bluetooth host module 602 constitutes a Bluetooth host in the communication system. Provides modem, serial port and NIDS network card data transmission interface to the application layer of the terminal device. The data on the modem and the serial port are multiplexed using the RFCOMM (Wireless Frequency Communication) protocol of Bluetooth. It can support 63 Modem ports or serial ports. NDIS NIC data transmission is encapsulated by Bluetooth's BENP (Bluetooth Network Encapsulation Protocol) protocol. All data is sent and received in the ACL data frame for transmission using Bluetooth L2CAP (Logical Link Control and Adaptation Protocol).

The virtual Bluetooth controller module 603 causes the PC side to install the Bluetooth device driver for the USB device by setting the USB device descriptor and the USB configuration descriptor. And, the virtual Bluetooth controller module 603 provides an interface for transmitting HCI commands, HCI events, and ACL packets. ACL data Use an endpoint Bulk OUT and a Bulk IN endpoint to transmit. The HCI command uses control endpoint transfers. HCI events are transmitted using the Interrupt IN endpoint.

The internal structure of the virtual Bluetooth controller module 603 is shown in Figure 9. The HCI command processing module completes receiving the HCI command sent by the Bluetooth host on the PC side, and after execution, returns the execution result of the command to the Bluetooth host on the PC side through the HCI event. The SDP protocol module completes the processing of the SDP protocol request of the Bluetooth side of the PC side. The serial port/Modem application interface provides access to the serial port and modem for the application layer of the wireless terminal. The data sent and received by the upper layer is first multiplexed/demultiplexed by the RFCOMM protocol module for multiple serial port and modem ports, and then sent to the L2CAP protocol implementation module, and finally encapsulated in the ACL data packet to communicate with the PC side port. The NIC application interface provides an interface for transmitting and receiving Ethernet frames to the application layer of the wireless terminal. The Ethernet frame sent and received by the upper layer is first processed by the BENP protocol module, then sent to the L2CAP protocol implementation module, and finally encapsulated in the ACL packet to communicate with the PC side port.

As shown in FIG. 8, the computer device in this embodiment includes:

The interface module 801 is configured to send a USB device enumeration instruction to the terminal side; and receive the device descriptor and the configuration descriptor returned by the USB device.

The Bluetooth Control Module 802 is used to enumerate and identify the virtual Bluetooth controller through device descriptors and configuration descriptors. The Bluetooth Control Module 802 includes a Bluetooth host driver and a Bluetooth protocol stack.

Specifically, the interface module 801 includes a USB interface, and sends a USB device enumeration instruction to the terminal side through the USB interface; and receives the device descriptor and the configuration descriptor returned by the USB device through the USB interface. The Bluetooth control module 802 learns that the terminal side is a Bluetooth device by parsing the device descriptor and the configuration descriptor, and enumerates and recognizes the virtual Bluetooth controller.

The interface module 801 is further configured to send a pairing request to the terminal side, and complete the pairing process with the terminal side. Specifically, the interface module 801 sends an Inquiry Scan command to the terminal side through the HCI command, and receives an HCI Inquiry Result HCI event that carries the MAC address of the virtual Bluetooth host returned by the terminal side, and receives an HCI Inquiry Complete HCI event returned by the terminal side. The interface module 801 is further configured to send a service discovery request to the terminal side, and receive a DUN, a serial port, and a PAN function identifier supported by the virtual bluetooth host returned by the terminal side. The Bluetooth Control Module 802 is also used to enumerate functions based on DUN, serial port and PAN function identification.

In the embodiment of the present invention, the device descriptor and the configuration descriptor are set in advance according to the Bluetooth feature, so that the PC (personal computer) side recognizes the USB device as a Bluetooth device when the USB device needs to be enumerated, and performs the Bluetooth device on the Bluetooth device. enumerate. Therefore, the USB device is simulated by the Bluetooth device, so the subsequent communication can be based on the Bluetooth protocol, and is not limited by the number of USB endpoints, and can support more USB sub-devices. Moreover, since the Bluetooth protocol is used for communication, the Bluetooth driver is loaded, and the USB driver does not need to be loaded, thereby avoiding the problems caused by the USB driver. Embodiments of the present invention also provide an implementation of pairing and service discovery to implement a complete process from connection to service delivery.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can be embodied in the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart and/or block diagrams, and combinations of flows and/or blocks in the flowcharts and/or block diagrams can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

These computer program instructions can also be stored in a bootable computer or other programmable data processing The apparatus is readable in a computer readable memory in a particular manner, such that instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device implemented in one or more flows and/or block diagrams of the flowchart The function specified in the box or in multiple boxes.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram. The spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

Claim

A method of simulating a universal serial bus (USB) device, the method comprising:

The terminal side returns the queried device descriptor and configuration descriptor to the PC side through the USB interface.

2. The method according to claim 1, wherein the terminal side receives the USB device enumeration command sent by the PC side of the personal computer through the USB interface: the terminal side receives the USB type USB sent by the PC side through the USB interface. The device enumerates the instruction; the terminal side returns the enumerated data of the Bluetooth controller class USB device according to the Bluetooth protocol;

The terminal side returns the queried device descriptor and the configuration descriptor to the PC side through the USB interface as follows: The terminal side converts the queried Bluetooth type device descriptor and configuration descriptor into a USB type device descriptor according to the USB protocol. And a configuration descriptor; the terminal side returns a USB type device descriptor and a configuration descriptor to the PC side through the USB interface.

3. The method according to claim 1, wherein the method further comprises: receiving, by the terminal side, a pairing request sent by the PC side, and completing a pairing process with the PC side.

4. The method according to claim 3, wherein the terminal side receives the pairing request sent by the PC side, and completes the pairing process with the PC side as:

The terminal side receives the query scan sent by the PC side through the Host Controller Interface (HCI) command.

(Invest Scan) command;

The terminal side returns to the PC side the query result of the media access control MAC address carrying the virtual bluetooth host, the HCI event;

The terminal side returns the query completion HCI event to the PC side.

5. The method according to claim 3, wherein the method further comprises: terminating the terminal The service discovery request sent by the PC side is received, and the Bluetooth specification identifier supported by the virtual bluetooth host is returned.

6. A method of simulating a USB device, the method comprising:

The PC sends a USB device enumeration instruction to the terminal side;

The method of claim 6, wherein the PC sends a USB device enumeration command to the terminal side: the PC side sends the USB device enumeration instruction to the terminal side through the USB interface;

The step of receiving, by the PC side, the device descriptor and the configuration descriptor returned by the USB device includes: receiving, by the PC side, a device descriptor and a configuration descriptor returned by the USB device through the USB interface;

The step of enumerating and identifying the virtual bluetooth controller by using the device descriptor and the configuration descriptor on the PC side includes: the PC side knows that the terminal side is a Bluetooth device by parsing the device descriptor and the configuration descriptor, and the virtual bluetooth controller is enumerated Lift and identify.

8. The method according to claim 6, wherein the method further comprises: the PC side sends a pairing request to the terminal side, and completes the pairing process with the terminal side.

The method according to claim 8, wherein the PC side sends a pairing request to the terminal side, and completes the pairing process with the terminal side as:

The PC side sends an Inquiry Scan command to the terminal side through the HCI command.

The PC side receives the query result of the MAC address carrying the virtual Bluetooth host returned by the terminal side.

HCI (INVEST Result HCI) event;

The PC side receives the query returned by the terminal side to complete the HCI (Investigation Complete HCI) event.

The method according to claim 8, wherein the method further comprises: the PC side sends a service discovery request to the terminal side; the PC side receives the Bluetooth specification identifier supported by the virtual bluetooth host returned by the terminal side; and the PC side according to the Bluetooth side The specification identifier performs a function enumeration.

A terminal device, the terminal device comprising:

The terminal device according to claim 11, wherein the interface module receives a USB type USB device enumeration command sent by the PC side through the USB interface;

The terminal device further includes: a virtual bluetooth controller module, configured to return the enumerated data of the Bluetooth controller class USB device according to the Bluetooth protocol; and convert the queried Bluetooth type device descriptor and the configuration descriptor according to the USB protocol Pay for USB type device descriptors and configuration descriptions;

The interface module is further configured to return a USB type device descriptor and a configuration descriptor to the PC side through the USB interface.

The terminal device according to claim 11, wherein the interface module is further configured to receive a pairing request sent by the PC side, and complete a pairing process with the PC side.

The terminal device according to claim 13, wherein the interface module receives an inquiry scan Inquiry Scan command sent by the PC side through an HCI command, and returns a media access control MAC address carrying the virtual bluetooth host to the PC side. The query results in the HCI event; returning the query to the PC side to complete the HCI event.

The terminal device according to claim 13, wherein the interface module is further configured to receive a service discovery request sent by the PC side, and return a Bluetooth specification identifier supported by the virtual bluetooth host.

16. A computer device, characterized in that the computer device comprises: An interface module, configured to send a USB device enumeration instruction to the terminal side; and receive a device descriptor and a configuration descriptor returned by the USB device;

A Bluetooth control module for enumerating and identifying virtual Bluetooth controllers through device descriptors and configuration descriptors.

The computer device according to claim 16, wherein the interface module comprises a USB interface, and the USB device enumeration instruction is sent to the terminal side through the USB interface; and the device descriptor returned by the USB device is received through the USB interface. And configuration descriptors;

The Bluetooth control module learns that the terminal side is a Bluetooth device by parsing the device descriptor and the configuration descriptor, and enumerates and identifies the virtual Bluetooth controller.

The computer device according to claim 16, wherein the interface module is further configured to send a pairing request to the terminal side, and complete the pairing process with the terminal side.

The computer device according to claim 18, wherein the interface module sends an Inquiry Scan command to the terminal side through an HCI command; and receives an Inquiry Result HCI event that carries a MAC address of the virtual Bluetooth host returned by the terminal side; Receives the Inquiry Complete HCI event returned by the terminal side.

The computer device according to claim 18, wherein the interface module is further configured to send a service discovery request to the terminal side; and receive a Bluetooth specification identifier supported by the virtual bluetooth host returned by the terminal side;

The Bluetooth Control Module is also used to enumerate functions based on DUN, serial port and PAN function identification.