WO2019165775A1

WO2019165775A1 - Local area network equipment searching method and searching system

Info

Publication number: WO2019165775A1
Application number: PCT/CN2018/104615
Authority: WO
Inventors: 黄成勇
Original assignee: 深圳市大迈科技有限公司
Priority date: 2018-02-28
Filing date: 2018-09-07
Publication date: 2019-09-06
Also published as: CN108521437A

Abstract

The invention is applied for the technical field of the network, and provides a searching method and searching system of local area network (LAN) equipment. The searching method of the local area network equipment comprises the following steps: primary equipment acquires a broadcast address of the located LAN when detecting a first preset instruction for searching slave equipment; the primary equipment sends an equipment searching request to a broadcast address of the LAN, thereby enabling the equipment searching request to be broadcasted in the local area network; and the slave equipment returns slave equipment information to the primary equipment according to the equipment searching request, so that the searching step of the LAN equipment is simplified.

Description

Search method and search system for local area network equipment

[Technical Field]

The invention belongs to the technical field of networks, and in particular relates to a search method and a search system for a local area network device.

【Background technique】

The existing IoT network is based on the Transmission Control Protocol (TCP) or the Internet Protocol (IP). To implement data transmission between smart devices, the IP address of the destination device must be obtained first, that is, Search for devices on the same LAN.

In the prior art, when searching for devices in the same local area network, the existing local area network device discovery protocol can be implemented, for example, a multicast domain name system (mDNS) protocol and universal plug and play (Universal). Plug and Play, UPnP) protocol, however, the existing LAN device discovery protocol has a complicated implementation process and cannot be compatible with many devices on the market, and has a problem of a small application range.

[Summary of the Invention]

In view of this, the embodiment of the present invention provides a search method and system for a local area network device, so as to solve the problem that the implementation process of the local area network device discovery protocol is complicated and has a small application scope.

A first aspect of the embodiments of the present invention provides a method for searching a local area network device, including:

If the master device detects the first preset instruction for searching for the slave device, acquiring the broadcast address of the local area network;

Sending, by the master device, a device search request to a broadcast address of the local area network, so that the device search request is broadcasted in the local area network;

The slave device returns slave device information to the master device according to the device search request.

A second aspect of the embodiments of the present invention provides a search system for a local area network device, including:

a master device, configured to acquire a broadcast address of a local area network if the first preset instruction for searching for the slave device is detected;

The master device is further configured to: send a device search request to a broadcast address of the local area network, so that the device search request is broadcasted in the local area network;

The slave device is configured to return slave device information to the master device according to the device search request.

The method for searching for a local area network device is provided by the embodiment of the present invention. When the primary device detects the first preset instruction for searching for the slave device, the master device obtains the broadcast address of the local area network, and the master device sends the device search to the broadcast address of the local area network. The request is such that the device search request is broadcast in the local area network, and the slave device returns the slave device information according to the device search request to the master device, simplifying the search step of the local area network device.

[Description of the Drawings]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the embodiments or the description of the prior art will be briefly described below. It is obvious that the drawings in the following description are only the present invention. For some embodiments, other drawings may be obtained from those of ordinary skill in the art in light of the inventive workability.

1 is a schematic flowchart of implementing a search method of a local area network device according to an embodiment of the present invention;

2 is a schematic flowchart of implementing a search method of a local area network device according to another embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a search system of a local area network device according to an embodiment of the present invention.

【Detailed ways】

In the following description, for purposes of illustration and description However, it will be apparent to those skilled in the art that the present invention may be practiced in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the invention.

In order to explain the technical solution described in the present invention, the following description will be made by way of specific embodiments.

Referring to FIG. 1 , it is a flow chart of implementing a search method of a local area network device according to an embodiment of the present invention. In this embodiment, the search method of the local area network device is applicable to data interaction between multiple devices, wherein at least one of the plurality of devices includes at least one master device. The search method of the local area network device shown in FIG. 1 may include:

S11: If the master device detects the first preset instruction for searching for the slave device, acquire the broadcast address of the local area network.

In step S11, the master device and the slave device are in the same local area network, and the local area network is a pre-created local area network, and the master device and the slave device respectively access the local area network through wired or wireless manner, and respectively serve as nodes in the local area network. . The broadcast address is the address used to broadcast the information to be broadcast to each node in the local area network in the local area network where the broadcast device is located.

It should be noted that, when the local area network is created, the broadcast address is a reserved address for sending information to each node in the local area network. When the content of the target address in the information header of the to-be-broadcast information is a broadcast address, the information may be Received by all nodes in the LAN.

In this embodiment, the master device performs a search operation on the slave device in the local area network, that is, realizes discovery between the devices in the local area network, and triggers the master device to search for the slave devices in the same local area network through the first preset instruction, thereby implementing the device. The discovery between.

As for when the master device detects the first preset instruction for searching for the slave device, it may include, but is not limited to, the following scenario.

The device is configured to perform the device discovery period. If the current time is the cycle time point for device discovery, the first preset instruction for searching the slave device is triggered, so that the master device configuration detects the first preset command. .

For example, after the current master device is connected to the local area network, the master device starts to work and acquires the current time. If the current time is the preset cycle time point, the first preset instruction for searching the slave device is triggered, and the first command is detected. When the preset command is received, the broadcast address of the local area network is obtained.

S12: The master device sends a device search request to a broadcast address of the local area network, so that the device search request is broadcasted in the local area network.

In step S12, the device search request is a User Datagram Protocol (UDP) broadcast packet, and the header content of the UDP broadcast packet includes: a device discovery command, a serial number, a device type, and an error code in a communication process.

In this embodiment, the UDP broadcast packet may adopt a JavaScript Object Notation (JSON) format, for example:

{"header":{"cmd":1024,"seq":2,"type":1,"error":0}}, where the content described by cmd is the device discovery command, and the content described by seq is The serial number, the content described by type is the device type, and the content described by error is the error code.

It should be noted that the device search request is used to discover a slave device in the local area network, which carries the information receiving port of the master device, and broadcasts the device search request to the local area network, so that the slave device in the local area network receives the device search request after receiving the device search request. The slave device information is returned to the information receiving port of the master device.

S13: The slave device returns the slave device information to the master device according to the device search request.

In step S13, the slave device information is used to describe the slave device attributes, including information such as the IP address of the slave device, the communication port, and the device identifier.

In this embodiment, the slave information is the response information of the device search request, and the response information may be in a JSON format, for example:

{"header":{"cmd":1024,"seq":4,"type":1,"error":0},"data":{"ip":"192.168.1.1","port": "27213"}}, where ip describes the IP address of the slave device, and the content described by the port is the communication port number of the slave device.

It should be noted that, since the slave device information describes the slave device attribute and is the response information of the device search request, when the master device receives the slave device information sent by the slave device, the master device can perform the search operation on the slave device in the local area network. .

It can be understood that the communication port of the slave device may include multiple, and when data transmission or communication is performed with different master devices, communication ports with the same or different communication port numbers may be selected.

It can be seen that, in the search method of the local area network device, the host device obtains the broadcast address of the local area network when the master device detects the first preset instruction for searching the slave device, and the master device sends the local area network to the local area network. The broadcast address transmitting device searches for a request to cause the device search request to be broadcast in the local area network, and the slave device returns the slave device information to the master device according to the device search request, simplifying the search step of the local area network device.

2 is a flowchart of implementing a search method of a local area network device according to another embodiment of the present invention. In this embodiment, the slave device information includes an internet protocol IP address, a communication port, and a connection state identifier of the slave device. As shown in FIG. 2, the search method of the local area network device includes:

S21: If the master device detects the first preset instruction for searching for the slave device, acquire the broadcast address of the local area network.

In step S21, the master device and the slave device are in the same local area network, and the local area network is a pre-created local area network, and the master device and the slave device respectively access the local area network through wired or wireless manner, and respectively serve as nodes in the local area network. . The broadcast address is the address used to broadcast the information to be broadcast to each node in the local area network in the local area network where the broadcast device is located.

S22: The master device sends a device search request to a broadcast address of the local area network, so that the device search request is broadcasted in the local area network.

As a possible implementation manner of this embodiment, step S22 specifically includes: the primary device creates a first user datagram protocol UDP socket based on the broadcast address, and describes the first UDP socket by using the first UDP socket. A port sends a connection status test request to the broadcast address.

It should be noted that a socket is a handle of a communication chain used to implement communication between different virtual machines or different computers. The master device creates a first UDP socket based on the broadcast address, the first UDP socket is a UDP broadcast socket, used to describe a broadcast address (IP address), and the master device performs data interaction with the broadcast address. First port.

In this embodiment, after the first UDP socket is created, the master device sends a device search request to the broadcast address through the first port described by the first UDP socket.

In all embodiments of the present application, before the socket is used, the existing SELECT character set needs to be cleared first, and the created UDP socket is added to the SELECT character set for information reception.

S23: The slave device returns the slave device information to the master device according to the device search request.

S24: The master device generates a slave device list according to the slave device information, where data in the slave device list is used to describe the slave device, an IP address of the slave device, the communication port, and the connection state. The correspondence between the identifiers.

In step S24, the slave device list is used to reflect all the slave devices searched by the master device, wherein the slave device is in the same local area network as the master device. The IP address of the slave device is used to describe the node address of the slave device in the local area network, and the communication port is a communication port for the slave device to exchange information with the master device, and the connection forwarding identifier is used to describe the connection state between the slave device and the master device. , that is, the state of connection from the LAN.

S25: The master device sends a connection state test request to the IP addresses of all the slave devices in the slave device list in sequence if detecting a second preset instruction for testing the slave device connection state.

In step S25, the connection status test request may be in a JSON format, for example:

{"header":{"cmd":1027,"seq":3,"type":1,"error":0}}; where cmd describes the device discovery command, and seq describes The serial number, the content described by type is the device type, and the content described by error is the error code.

In this embodiment, after the slave device returns the slave device information to the master device according to the device search request, in order to be able to timely learn the connection state of the slave device and the local area network, the master device generates a slave device list according to the slave device information, and detects that the slave device is used for When the second preset instruction of the slave device connection state is tested, a connection state test request is sent to all the slave devices that are searched, and since the slave device lists the IP addresses of all the slave devices, the master device sequentially goes to the slave device. By sending a connection status test request to all the slave devices' IP addresses in the list, the connection status detection can be performed on all the slave devices that are searched.

It should be noted that the second preset instruction for testing the connection state of the slave device is triggered by the master device.

For example, the test period of the device connection state is configured for the master device, and if the current time is the test cycle time point for performing the device connection state, the second preset instruction for testing the slave device connection state is triggered, so that the master The device configuration detects the second preset instruction.

It can be understood that, in practice, the second preset instruction may also be triggered by the tester when the tester performs debugging on the master device and the slave device in the local area network.

As a possible implementation manner of this embodiment, step S25 specifically includes: the master device creates a second UDP socket based on an IP address of the slave device, and describes the second UDP socket by using the second UDP socket. The two ports send a connection status test request to the slave device.

It should be noted that the connection status test request carries the address information of the second port.

In this embodiment, for a plurality of slave devices in the slave device list, multiple second UDP sockets with different contents may be created, and each second UDP socket corresponds to an IP address of the slave device, and multiple seconds. The UDP sockets are unicast sockets. After the second UDP socket is created, the master device sends the second port described by each second UDP socket to each slave device in the slave device list. The IP address sends a connection status test request.

S26: The slave device receives the connection state test request, and returns the target information to the master device through the communication port according to the connection state test request.

In step S26, the target information is used to describe that the connection state between the slave device and the local area is normal.

In this embodiment, the target information may be in a JSON format, for example:

{"header":{"cmd":1027,"seq":5,"type":1,"error":0}}; where cmd describes the device discovery command, and the content described by seq is The serial number, the content described by type is the device type, and the content described by error is the error code.

When the slave device and the master device are in the same local area network, and the master device can exchange information based on the IP address in the local area network, the slave device can receive the connection state test request, and generate a target according to the connection state test request. The information is returned to the master device through the communication port; when the slave device is not in the same local area network as the master device, and the master device cannot exchange information based on the IP address in the local area network, the slave device cannot receive the connection state. Test request.

By sequentially transmitting a connection status test request to the IP addresses of all the slave devices in the slave device list, if the slave device receives the connection state test request, the slave device returns the target information to the master device through the communication port according to the connection state test request. After the master device is searched for the slave device in the local area network, it can update the online condition of the slave device in the local area network in time, that is, update the information of the searched local area network device in time.

As a possible implementation manner of the embodiment, the connection state test request carries the address information of the second port, and the step S26 specifically includes: the slave device according to the address information, to the second through the communication port. The port returns the target information.

S27: If the master device receives the target information, determine that the connection status of the slave device is normal.

S28: If the master device does not receive the target information, determine that the connection status of the slave device is abnormal.

In this embodiment, the connection status identifier is used to characterize the connection status between the slave device and the local area network.

As a possible implementation manner of the embodiment, the connection status identifier may be a specific value, where the value is used to describe the number of times the master device sends a connection status test request to the slave device. In the device list, each slave device corresponds to one. A connection status identifier, which is used to describe the number of times the master device sends a connection status test request to the slave device.

When the master device detects the second preset instruction for testing the slave device connection state, the connection state test request is sequentially sent to the IP addresses of all the slave devices in the slave device list. For each slave device, after the master device sends a connection state test request to the IP address of the slave device, the master device modifies the connection state identifier in the slave device list, that is, performs a subtraction operation on the value corresponding to the connection state identifier. When the master device receives the target information, and the value represented by the connection status identifier is not 0, it determines that the connection status of the slave device is normal; when the master device does not receive the target information, and the value represented by the connection status identifier is 0, then It is determined that the connection status of the slave device is abnormal.

Further, when the master device does not receive the target information, and the value represented by the connection state identifier is 0, determining that the connection state of the slave device is abnormal, the method may further include: when the master device does not receive the target information, listening to the second Whether the second port described by the UDP socket is enabled, if the second port is disabled, the second port is enabled to receive the target information; when the primary device does not receive the target information, and the second port is enabled, the connection status identifier is characterized When the value is 0, it is determined that the connection status of the slave device is abnormal.

By sequentially transmitting a connection status test request to the IP addresses of all the slave devices in the slave device list, if the slave device receives the connection state test request, the slave device returns the target information to the master device through the communication port according to the connection state test request. After searching for the slave devices in the local area network, the master device can update the online status of the slave devices in the local area network in time, that is, timely update the information of the searched local area network devices.

Referring to FIG. 3, FIG. 3 is a schematic structural diagram of a search system of a local area network device according to an embodiment of the present invention. The search system 2 of the local area network device of the present embodiment includes: a master device 21 and a slave device cluster 22, wherein the slave device cluster 22 includes a plurality of slave devices 221.

The master device 21 is configured to acquire a broadcast address of a local area network if the first preset instruction for searching for the slave device is detected.

The master device 21 is further configured to send a device search request to a broadcast address of the local area network to cause the device search request to be broadcasted in the local area network.

The slave device 221 is configured to return the slave device information to the master device according to the device search request.

Further, the slave device information includes an internet protocol IP address, a communication port, and a connection state identifier of the slave device.

Further, as a possible implementation manner of the embodiment, the master device 21 is further configured to generate, according to the slave device information, a slave device list, where the data in the slave device list is used to describe the slave device, the slave device Correspondence between the IP address of the device, the communication port, and the connection status identifier.

The master device 21 is further configured to: if the second preset instruction for testing the connection state of the slave device is detected, send a connection state test request to the IP addresses of all the slave devices in the slave device list in sequence .

The slave device 221 is further configured to: if the connection state test request is received, return the target information to the master device through the communication port according to the connection state test request.

Upon receiving the target information, the master device 21 determines that the connection state of the slave device is normal.

If the master device 21 does not receive the target information, it determines that the connection state of the slave device is abnormal.

Further, as a possible implementation manner of the embodiment, the master device 21 is specifically configured to: create a first user datagram protocol UDP socket based on the broadcast address, and describe the first UDP socket by using the first UDP socket A port sends a connection status test request to the broadcast address.

Further, as a possible implementation manner of the embodiment, the master device 21 is specifically configured to create a second UDP socket based on the IP address of the slave device, and describe the second UDP socket by using the second UDP socket. The two ports send a connection status test request to the slave device, where the connection status test request carries address information of the second port.

The slave device 221 is specifically configured to return target information to the second port through the communication port according to the address information.

The above is only the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any equivalent person can be easily conceived within the technical scope of the present invention by any person skilled in the art. Modifications or substitutions are intended to be included within the scope of the invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

A search method for a local area network device, characterized in that the search method comprises:

If the master device detects the first preset instruction for searching for the slave device, acquiring the broadcast address of the local area network;

Sending, by the master device, a device search request to a broadcast address of the local area network, so that the device search request is broadcasted in the local area network;

The slave device returns slave device information to the master device according to the device search request.
The search method according to claim 1, wherein said slave device information comprises an internet protocol IP address, a communication port, and a connection state identifier of said slave device.
The search method of claim 2, wherein the searching method further comprises:

The master device generates a slave device list according to the slave device information, where the data in the slave device list is used to describe the slave device, an IP address of the slave device, the communication port, and the connection state identifier. Correspondence between

If the master device detects a second preset instruction for testing the connection state of the slave device, sending a connection state test request to the IP addresses of all the slave devices in the slave device list in sequence;

Receiving, by the slave device, the connection state test request, returning target information to the master device through the communication port according to the connection state test request;

If the master device receives the target information, determining that the connection status of the slave device is normal;

If the master device does not receive the target information, it determines that the connection state of the slave device is abnormal.
The search method according to claim 1, wherein the master device sends a device search request to the broadcast address of the local area network, so that the device search request is broadcasted in the local area network, including:

The master device creates a first user datagram protocol UDP socket based on the broadcast address, and sends a connection state test request to the broadcast address through the first port described by the first UDP socket.
The search method according to claim 3, wherein if the master device detects a second preset instruction for testing the connection state of the slave device, it sequentially goes to all of the slave device lists. Send a connection status test request from the IP address of the device, including:

The master device creates a second UDP socket based on the IP address of the slave device, and sends a connection state test request to the slave device through the second port described by the second UDP socket, the connection The status test request carries the address information of the second port;

And if the slave device receives the connection state test request, returning target information to the master device by using the communication port according to the connection state test request, including:

The slave device returns target information to the second port through the communication port according to the address information.
A search system for a local area network device, characterized in that the search system comprises:

a master device, configured to acquire a broadcast address of a local area network if the first preset instruction for searching for the slave device is detected;

The master device is further configured to: send a device search request to a broadcast address of the local area network, so that the device search request is broadcasted in the local area network;

The slave device is configured to return slave device information to the master device according to the device search request.
The search system according to claim 6, wherein said slave device information comprises an internet protocol IP address, a communication port, and a connection state identifier of said slave device.
The search system of claim 7 wherein:

The master device is further configured to generate, according to the slave device information, a slave device list, where data in the slave device list is used to describe the slave device, an IP address of the slave device, the communication port, and the Correspondence between connection status identifiers;

The master device is further configured to: if the second preset instruction for testing the connection state of the slave device is detected, send a connection state test to the IP addresses of all the slave devices in the slave device list in sequence request;

The slave device is further configured to: if the connection state test request is received, return the target information to the master device by using the communication port according to the connection state test request;

If the master device receives the target information, determining that the connection status of the slave device is normal;

If the master device does not receive the target information, it determines that the connection state of the slave device is abnormal.
The search system according to claim 6, wherein the master device is specifically configured to: create a first user datagram protocol UDP socket based on the broadcast address, and describe by using the first UDP socket The first port sends a connection status test request to the broadcast address.
The search system according to claim 8, wherein the master device is specifically configured to: create a second UDP socket based on an IP address of the slave device, and describe the second UDP socket by using the second UDP socket The second port sends a connection status test request to the slave device, where the connection status test request carries address information of the second port;

The slave device is specifically configured to return target information to the second port by using the communication port according to the address information.