CN113411367B - Method, device, equipment, system and storage medium for establishing connection of monitoring equipment - Google Patents

Abstract

The invention discloses a method, device, device, system and computer-readable storage medium for establishing a connection between monitoring equipment; After the response, if the next request sent by the client is not received, the monitoring device automatically modifies the mapping relationship between the router and the monitoring device by replacing the original port with the alternate port, so that the response request can be sent to the client through the modified mapping relationship. , in order to successfully establish the connection between the client and the monitoring device, so that when the client obtains the live and playback data of the monitoring device, the black screen will not appear due to the port being disabled by the router; and this cancellation of the original port mapping relationship retains the router. The internal port method can ensure that the NAT networking is normal, and there will be no abnormal flow interruption caused by the change of the internal port.

Description

Method, device, device, system and storage medium for establishing connection for monitoring equipment

technical field

The present invention relates to the technical field of data interaction, and more particularly, to a method, apparatus, device, system and computer-readable storage medium for establishing a connection between monitoring equipment.

Background technique

At present, in the field of monitoring, the commonly used standard networking is NVR (Network Video Recorder, network video recorder) and IPC (IP CAMERA, network camera) under the local area network, through the router port mapping to the external network, through RTSP (Real Time Streaming) Protocol, real-time streaming protocol) to transmit audio and video streams for users to access remotely The service website and the mobile client perform audio and video interaction. However, at present, some common routers will automatically disable some ports of devices in NAT (Network Address Translation) from interacting through NAT. For example, some routers will automatically disable the 554 ports of devices in NAT from interacting through NAT, which will lead to RTSP. It cannot transmit through NAT. When users view the live and playback of cameras and recorders, there will be a black screen phenomenon, which cannot be used normally, and users cannot know that it is caused by the disabled port of the router, nor can they know how to avoid this problem.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method, device, device, system and computer-readable storage medium for establishing a connection between monitoring equipment, so as to avoid the problem that data transmission cannot be performed through the port due to the port being disabled by the router.

To achieve the above purpose, a method for establishing a connection for a monitoring device provided by the present invention includes:

Receive a connection request forwarded by the router through an internal port, where the connection request is sent by the client to the router through an external port, and the internal port has a mapping relationship with the external port;

sending a response request corresponding to the connection request to the router through the internal port, so that the router forwards the response request to the client through the external port;

If no other request sent by the client is received within the first predetermined period of time after the response request is sent, the router cancels the mapping relationship between the internal port and the external port, and establishes the backup the mapping relationship between the port and the external port;

Sending the response request to the router through the alternate port, so that the router forwards the response request to the client through the external port, thereby establishing a connection between the monitoring device and the client .

Wherein, receiving the connection request forwarded by the router through the internal port includes:

Receive the OPTIONS request to establish an RTSP connection forwarded by the router through the internal port.

Wherein, canceling the mapping relationship between the internal port and the external port at the router, and establishing the mapping relationship between the standby port and the external port, includes:

sending a mapping relationship cancellation instruction to the router, where the mapping relationship cancellation instruction is used to cancel the mapping relationship between the internal port and the external port;

If the prompt information sent by the router indicating that the mapping relationship is canceled successfully is received, a mapping relationship creation instruction is sent to the router, and the mapping relationship creation instruction is used to establish the mapping relationship between the standby port and the external port.

Wherein, sending the response request to the router through the standby port includes:

If the prompt information sent by the router that the mapping relationship is established successfully is received, the response request is sent to the router through the standby port.

Wherein, if no other requests sent by the client are received within the first predetermined period of time after the response request is sent, the method further includes:

sending a keep-alive command to the client through the router;

Determine whether a keep-alive response command forwarded by the client through the router is received within a second predetermined period of time;

If so, execute the step of canceling the mapping relationship between the internal port and the external port on the router, and establishing a mapping relationship between the standby port and the external port.

In order to achieve the above object, the present invention further provides a device for establishing a connection between monitoring equipment, including:

a receiving module, configured to receive a connection request forwarded by a router through an internal port, where the connection request is sent by a client to the router through an external port, and the internal port has a mapping relationship with the external port;

a first sending module, configured to send a response request corresponding to the connection request to the router through the internal port, so that the router forwards the response request to the client through the external port;

A port replacement module, configured to cancel the mapping relationship between the internal port and the external port when the router does not receive other requests sent by the client within the first predetermined period of time after the response request is sent, and establishing a mapping relationship between the standby port and the external port;

A second sending module, configured to send the response request to the router through the standby port, so that the router forwards the response request to the client through the external port, thereby establishing the monitoring The connection of the device to the client.

Wherein, the device also includes:

a third sending module, configured to send a keep-alive command to the client through the router;

a judging module for judging whether a keep-alive response command forwarded by the client through the router is received within a second predetermined period of time;

The port replacement module is configured to cancel the mapping relationship between the internal port and the external port when the router cancels the mapping relationship between the internal port and the external port when receiving the keep-alive response command forwarded by the client through the router within a second predetermined period of time, and establishing a mapping relationship between the standby port and the external port.

To achieve the above object, the present invention further provides an electronic device, comprising:

memory for storing computer programs;

The processor is configured to implement the steps of the above-mentioned method for establishing a connection for a monitoring device when executing the computer program.

In order to achieve the above object, the present invention further provides a connection establishment system, including: a client, a router, and the above electronic device.

In order to achieve the above object, the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned method for establishing a connection between a monitoring device and a monitoring device are implemented. .

As can be seen from the above solutions, a method for establishing a connection for a monitoring device provided by an embodiment of the present invention includes: receiving a connection request forwarded by a router through an internal port, where the connection request is sent by a client to the router through an external port, and the The internal port has a mapping relationship with the external port; the response request corresponding to the connection request is sent to the router through the internal port, so that the router forwards the response request to the router through the external port. If no other request sent by the client is received within the first predetermined period of time after sending the response request, the router will cancel the mapping relationship between the internal port and the external port, and establishing a mapping relationship between the standby port and the external port; sending the response request to the router through the standby port, so that the router forwards the response request to the client through the external port terminal, thereby establishing the connection between the monitoring device and the client.

It can be seen that in this solution, when the client establishes a connection with the monitoring device, if the monitoring device does not receive the next request sent by the client after returning a request response to the client through the original port, the monitoring device replaces the original port with the original port. Port, automatically modify the mapping relationship between the router and the monitoring device, so that the response request can be sent to the client through the modified mapping relationship to successfully establish the connection between the client and the monitoring device, so that the client can obtain the live and playback of the monitoring device. In addition, this method of canceling the original port mapping relationship and retaining the internal ports of the router can ensure that the NAT networking is normal, and there will be no abnormality caused by internal port changes. Outage problem.

The invention also discloses an apparatus, equipment, system and computer-readable storage medium for establishing a connection between monitoring equipment, which can also achieve the above technical effects.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic diagram of a common monitoring network in the prior art;

2 is a schematic structural diagram of a system for establishing a connection between a monitoring device disclosed in an embodiment of the present invention;

3 is a schematic flowchart of a method for establishing a connection for a monitoring device disclosed in an embodiment of the present invention;

4 is a schematic flowchart of another method for establishing a connection for a monitoring device disclosed in an embodiment of the present invention;

FIG. 5 is a flow chart of an overall solution disclosed in an embodiment of the present invention;

6 is a sequence diagram of an interaction through NAT disclosed in an embodiment of the present invention;

7 is a schematic structural diagram of an apparatus for establishing a connection for a monitoring device disclosed in an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of an electronic device disclosed in an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

At present, the router will prohibit some ports from interacting through NAT, which will cause data to fail to pass through NAT. For example, when the client obtains the audio and video data of the monitoring device in the NAT, because the RTSP port 554 is disabled, the audio and video streams cannot be transmitted through NAT. , the actual situation and playback black screen will appear on the client side. However, the actual end user cannot perceive the problem because the router disables port 554, and cannot know that modifying the RTSP port can avoid this problem. At the same time, modifying the RTSP port directly, which does not conform to the standard protocol, may exist consistency and compatibility The problem will also cause abnormal interruption of RTSP of NAT.

Therefore, in this application, a method, device, device, system and computer-readable storage medium for establishing a connection between monitoring equipment are disclosed. Through this solution, the monitoring equipment in the NAT can be prevented from being caused by the router disabling ports such as 554. The live and playback functions are unavailable, and the 554 port of the device itself in the NAT does not change, which ensures that the NAT networking is normal, and there will be no abnormal flow interruption caused by the change of the RTSP port.

For ease of understanding, the following introduces the system architecture to which the technical solutions of the present application are applicable. In the present application, the system may include a client, a router and an electronic device. In this embodiment, the electronic device is described by taking a monitoring device as an example. 2 , which is a schematic structural diagram of a system for establishing a connection between a monitoring device disclosed in an embodiment of the present invention. As can be seen from FIG. 1 , the system may include a client 11 , a router 12 and a monitoring device 13 .

The client 11 is used to send a connection request to the router 12 through an external port, and the client 11 may include, but is not limited to, a smart phone, a tablet computer, a notebook computer, a desktop computer, or a smart wearable device.

The router 12 is used to realize data interaction between the client 11 and the monitoring device 13 , and forward the connection request sent by the client to the monitoring device 13 .

The monitoring device 13 is configured to receive the connection request through the internal port, and send the response request corresponding to the connection request to the router 12 through the internal port, and the router 12 then forwards the response request to the client 11 through the external port; Within the first predetermined period of time after sending the response request, the monitoring device 13 does not receive other requests sent by the client 11, then replaces the internal port with the spare port, and establishes a mapping relationship between the spare port and the external port on the router 13; The response request is sent to the router 13 through the spare port, so that the router 13 forwards the response request to the client through the external port, thereby establishing the connection between the monitoring device and the client. Moreover, the monitoring device in this application may specifically be any video capture device such as NVR and IPC.

Referring to FIG. 3 , a schematic flowchart of a method for establishing a connection for a monitoring device provided by an embodiment of the present invention may specifically include:

S101, receiving the connection request forwarded by the router through the internal port, the connection request is sent by the client to the router through the external port, and the internal port and the external port have a mapping relationship;

It can be understood that the internal port and the external port in this application are two ports with a mapping relationship. When the client sends a connection request to the monitoring device, it needs to send the connection request to the external port of the router, and the router communicates with the external port through the internal port. Port mapping relationship, forward connection requests to monitoring devices through internal ports.

Specifically, if the audio and video streams are transmitted between the client and the monitoring device through RTSP, the connection request is an OPTIONS request for establishing an RTSP connection that is forwarded by the router and received through the internal port. In this embodiment, the RTSP internal port can be set to 554, and the RTSP external port can be set to 8554, then the connection request is sent to the router through port 8554, and the router sends the connection request to the monitoring device through port 554.

S102, sending the response request corresponding to the connection request to the router through the internal port, so that the router forwards the response request to the client through the external port;

In this embodiment, after receiving the connection request, the monitoring device will send the response request corresponding to the connection request to the client through the internal port and the external port; if the router does not disable the internal port, the response request will be sent through the router To the client, the client will continue to send other connection requests to the monitoring device; if the router disables the internal port, the client will not receive the response request. Specifically, if the connection request is an OPTIONS request for establishing an RTSP connection, since the OPTIONS request is used to inquire about the available methods of the monitoring device, the response command returned by the monitoring device to the client will include the available methods for the monitoring device. Methods, such as: OPTIONS, DESCRIBE, SETUP, TEARDOWN, PLAY, etc.

S103, if other requests sent by the client are not received within the first predetermined period of time after sending the response request, cancel the mapping relationship between the internal port and the external port at the router, and establish the mapping relationship between the standby port and the external port;

It can be understood that when establishing an RTSP connection in this application, the client first sends an OPTIONS connection request to the monitoring device, and after the client obtains the parameters in the response request, it will send other requests to the monitoring device, such as: DESCRIBE request ( In order to get the session description information), SETUP request (used to remind the server to establish a session, and determine the transmission mode) and so on. However, if the client cannot receive the response request sent by the monitoring device because the router disables some ports, the client will not send other requests to the monitoring device.

Therefore, in order to ensure that the router will not fail to establish a connection due to port disabling, the monitoring device will start timing after sending a response request to the client to determine whether other requests sent by the client are received within the first predetermined period of time; For other requests, it means that the router has not disabled the port. In this case, there is no need to perform the subsequent process. If no other request is received, it means that the router may not send the response request to the client because the port is disabled. The port replaces the internal port, that is, cancel the mapping relationship between the original internal port and the external port, establish the mapping relationship between the standby port and the external port, and send a response request to the client through the router again through the re-established port mapping relationship. For example: if the internal port of RTSP is 554 and the external port is 8554, 554 and 8554 have a mapping relationship. When establishing RTSP, the request is sent through port 554 and port 8554; if port 554 is replaced by port 555, 554 needs to be cancelled. The mapping relationship between port and port 8554 is established, and the mapping relationship between port 555 and port 8554 is established, and requests are sent through port 555 and port 8554.

S104: Send the response request to the router through the standby port, so that the router forwards the response request to the client through the external port, thereby establishing a connection between the monitoring device and the client.

In this application, after replacing the internal port with the alternate port, a response request will be sent to the client again through the re-established mapping relationship between the alternate port and the external port to complete the establishment of the RTSP connection between the monitoring device and the client, and transmit audio and video flow. It should be noted that if the internal port is replaced by the spare port, other requests sent by the client cannot be received. At this time, it means that the command transmission is not interrupted due to the port being disabled by the router, but may be caused by other reasons, such as Network failure, equipment failure, etc., you can report the problem to the administrator, and the administrator can repair it manually.

It can be seen from the above that when the client establishes a connection with the monitoring device, if the monitoring device does not receive the next request sent by the client after returning a request response to the client through the original port, the monitoring device will replace the original port with the alternate port. , automatically modify the mapping relationship between the router and the monitoring device so that the response request can be sent to the client through the modified mapping relationship, so as to successfully establish the connection between the client and the monitoring device, so that when the client obtains the live and playback data of the monitoring device , there will be no black screen phenomenon caused by the router disabling the port; in addition, this method of canceling the original port mapping relationship and retaining the internal port of the router can ensure that the NAT networking is normal, and there will be no abnormal flow interruption caused by the change of the internal port. question.

Referring to FIG. 4 , another schematic flowchart of a method for establishing a connection for a monitoring device provided by an embodiment of the present invention; it should be noted that the similarities between this embodiment and the previous embodiment can be referred to each other, and details are not repeated here; In this embodiment, the method may specifically include:

S201, receiving the connection request forwarded by the router through the internal port, the connection request is sent by the client to the router through the external port, and the internal port and the external port have a mapping relationship;

S202, sending the response request corresponding to the connection request to the router through the internal port, so that the router forwards the response request to the client through the external port;

S203. If no other requests sent by the client are received within the first predetermined time period after the response request is sent, send a keep-alive command to the client through the router;

S204, determine whether the keep-alive response command forwarded by the client through the router is received within the second predetermined duration; if so, execute S205; if not, end the process;

It can be understood that, if the monitoring device does not receive other requests sent by the client within the first predetermined period of time, it may be caused by a port disabling problem, or it may be caused by a network failure or a device failure problem. Therefore, in this embodiment, in order to avoid that, after modifying the port mapping relationship, the response request cannot be sent through the modified port mapping relationship, resulting in invalid modification of the port mapping relationship, before modifying the mapping relationship, send a request to the client by sending a message to the client. The keep-alive command detects whether the network or the client is faulty, so as to eliminate other possible problems.

Specifically, the port for sending the keep-alive command is different from the port for sending the connection request. The port for the keep-alive command is the http port, and the port for the connection request is the RTSP port. Therefore, the problem of port disabling does not occur. The specific process of sending the keep-alive command between the monitoring device and the client includes: the monitoring device sends the keep-alive command to the client through the router, and starts timing; if the network or device fails, the client will not receive the keep-alive command. , it will not send a keep-alive response command to the monitoring device, that is, the monitoring device will not receive a keep-alive response command within the second predetermined period of time after sending the keep-alive command, and the monitoring device will know that it has not received the client Other requests were sent because of network or device failure, not because the port was disabled. On the contrary, if the network is correct and there is no fault, the client can successfully receive the keep-alive command, and send a keep-alive response command to the monitoring device through the router. After the monitoring device receives the keep-alive command, it knows that the client has If the network between the monitoring devices is normal, it can be determined that the client cannot receive the response request because the port is disabled, and then continue to execute S205-S207.

S205, sending a mapping relationship cancellation instruction to the router, where the mapping relationship cancellation instruction is used to cancel the mapping relationship between the internal port and the external port;

S206. If receiving the prompt information sent by the router that the mapping relationship is cancelled successfully, send a mapping relationship creation instruction to the router, where the mapping relationship creation instruction is used to establish the mapping relationship between the standby port and the external port.

S207, if receiving the prompt information sent by the router that the mapping relationship is established successfully, send the response request to the router through the standby port, so that the router forwards the response request to the client through the external port, thereby establishing the connection between the monitoring device and the client.

In this embodiment, when the internal port is replaced by the spare port, the monitoring device needs to interact with the router, and first sends a mapping relationship cancellation instruction to the router to cancel the mapping relationship between the internal port and the external port. The device sends a message indicating that the mapping relationship is canceled successfully. At this time, the monitoring device will send a mapping relationship creation instruction to the router to establish the mapping relationship between the standby port and the external port. If the mapping relationship is established successfully, the router will send a mapping relationship to the monitoring device. For successful prompt information, only after the mapping relationship is successfully cancelled and established, the response request will be sent to the router again through the standby port, so as to ensure the successful modification of the mapping relationship.

The following describes the method for establishing a connection for the monitoring device described in this solution by describing a specific application scenario example. In this embodiment, the monitoring device is an NVR, the client and the NVR need to establish an RTSP connection, and the connection request sent by the client to the NVR is an OPTIONS request. In addition, the standard port (internal port) of RTSP is 554, here the spare port is 555, the external port of RTSP is 8554, the IP address of NVR is 192.168.1.100, and the WAN port address of the router is 192.168.0.10.

Referring to FIG. 5, the overall solution flow chart provided by the embodiment of the present invention; it can be seen from this figure that the solution is mainly divided into the following steps:

Step 1: The NVR records the external port number of the port mapping, and the client adds the NVR;

The external port number is the port number of the external port, and the steps mainly include: the monitoring device initiates UPNP (Universal Plug and Play, Universal Plug and Play) and records the mapped port, the client adds the monitoring device, and the monitoring device Send the RTSP address carrying the external port to the client, for example: after the NVR is connected to the router, enable UPNP port mapping, map HTTP, RTSP and other ports to the outside of the NAT, where port 554 is mapped to 8554, and then the client adds the NVR, The NVR goes online and returns the RTSP url of the live playback to the client. The format of the RTSP url is based on the live mainstream example: rtsp://192.168.0.10:8554/media/video1, 192.168.0.10 is the WAN port address of the router, and 8554 is the WAN port address of the router. External port after NVR port mapping.

Step 2: The client initiates an RTSP live request, and the NVR detects that there is no follow-up process after the RTSP OPTIONS signaling is returned, and initiates a keep-alive command to confirm whether the client is online.

Step 3: NVR cancels the port mapping of RTSP port 554, and maps port 555 to port 8854. NVR continues to complete RTSP signaling interaction and audio and video streaming through port 555.

It should be noted that the overall flow chart of FIG. 5 does not specifically describe the process of initiating a keep-alive command. Referring to FIG. 6 , it is a sequence diagram of the interaction through NAT provided by the embodiment of the present invention. The fourth part is explained, including:

F1: The client establishes an RTSP connection to the RTSP external mapping port of the monitoring device (NVR) and sends an OPTIONS request.

F2: The router forwards OPTIONS to the NVR.

F3: The NVR responds to the OPTIONS request and returns the response request.

F4: The router disables port 554, so it does not forward the returned packets in F3. At this time, the NVR initiates keep-alive through the HTTP port.

F5: The router forwards the keep-alive command to the client.

F6: The client responds to the keep alive command.

F7: The router forwards the keep-alive command to the NVR.

F8: NVR cancels port mapping of RTSP 554 port.

F9: The router returns that the port mapping was cancelled successfully.

F10: NVR maps port 555 to the external mapped port of port 554.

F11: The router returns that the port mapping is successful.

F12: The NVR will continue to return the response request through port 555, and complete the subsequent RTSP stream construction and audio and video stream transmission on port 555.

F13: The router forwards the packet.

From the above, it can be seen that in this application, a mechanism for automatically modifying port mapping can be established through the interaction of the http keep-alive command and RTSP signaling between the client and the monitoring master device, which can solve the monitoring in the NAT The problem that the 554 port is disabled by the router to solve the problem that the monitoring equipment in the NAT cannot live and playback.

The following describes an apparatus for establishing a connection for a monitoring device provided by an embodiment of the present invention. The apparatus for establishing a connection for a monitoring device described below and the method for establishing a connection for a monitoring device described above may refer to each other.

Referring to FIG. 7 , a schematic structural diagram of an apparatus for establishing a connection between monitoring equipment provided by an embodiment of the present invention; the apparatus includes:

A receiving module 21, configured to receive a connection request forwarded by a router through an internal port, where the connection request is sent by a client to the router through an external port, and the internal port has a mapping relationship with the external port;

a first sending module 22, configured to send a response request corresponding to the connection request to the router through the internal port, so that the router forwards the response request to the client through the external port ;

The port replacement module 23 is configured to cancel the mapping relationship between the internal port and the external port when the router does not receive other requests sent by the client within the first predetermined period of time after the response request is sent , and establish the mapping relationship between the standby port and the external port;

The second sending module 24 is configured to send the response request to the router through the standby port, so that the router forwards the response request to the client through the external port, thereby establishing the The connection between the monitoring device and the client is monitored.

The receiving module is specifically configured to: receive an OPTIONS request for establishing an RTSP connection forwarded by a router through an internal port.

Wherein, the port replacement module includes:

a first instruction sending module, configured to send a mapping relationship cancellation instruction to the router, where the mapping relationship cancellation instruction is used to cancel the mapping relationship between the internal port and the external port;

The second instruction sending module is configured to send a mapping relationship creation instruction to the router when receiving the prompt information sent by the router that the mapping relationship is canceled successfully, where the mapping relationship creation instruction is used to establish the connection between the standby port and the Describe the mapping relationship of external ports.

Wherein, the second sending module is specifically configured to: send the response request to the router through the standby port when receiving the prompt information sent by the router that the mapping relationship is established successfully.

Among them, this program also includes:

a third sending module, configured to send a keep-alive command to the client through the router;

a judging module for judging whether a keep-alive response command forwarded by the client through the router is received within a second predetermined period of time;

The port replacement module is configured to cancel the mapping relationship between the internal port and the external port when the router cancels the mapping relationship between the internal port and the external port when receiving the keep-alive response command forwarded by the client through the router within a second predetermined period of time, and establishing a mapping relationship between the standby port and the external port.

Referring to FIG. 8 , a schematic structural diagram of an electronic device provided by an embodiment of the present invention includes:

memory 31 for storing computer programs;

The processor 32 is configured to implement the steps of the method for establishing a connection for a monitoring device according to any of the above method embodiments when executing the computer program.

In this embodiment, the device may be a device such as an NVR or an IPC.

The device may include a memory 31 , a processor 32 and a bus 33 .

The memory 31 includes at least one type of readable storage medium, including flash memory, hard disk, multimedia card, card-type memory (eg, SD or DX memory, etc.), magnetic memory, magnetic disk, optical disk, and the like. The memory 31 may in some embodiments be an internal storage unit of the device, such as a hard disk of the device. In other embodiments, the memory 31 may also be an external storage device of the device, such as a plug-in hard disk, a smart memory card (SmartMedia Card, SMC), a secure digital (Secure Digital, SD) card, a flash memory card ( Flash Card), etc. Further, the memory 31 may also include both an internal storage unit of the device and an external storage device. The memory 31 can be used not only for storing application software and various types of data installed in the device.

In some embodiments, the processor 32 may be a central processing unit (Central Processing Unit, CPU), controller, microcontroller, microprocessor or other data processing chip for executing program codes or processing stored in the memory 31 data.

The bus 33 may be a peripheral component interconnect (PCI for short) bus or an extended industry standard architecture (extended industry standard architecture, EISA for short) bus or the like. The bus can be divided into address bus, data bus, control bus and so on. For ease of presentation, only one thick line is used in FIG. 8, but it does not mean that there is only one bus or one type of bus.

Further, the device may also include a network interface 34, and the network interface 34 may optionally include a wired interface and/or a wireless interface (such as a WI-FI interface, a Bluetooth interface, etc.), which is usually used between the device and other electronic devices Establish a communication connection.

FIG. 8 only shows the device with components 31-34. Those skilled in the art can understand that the structure shown in FIG. Either some components are combined, or different component arrangements.

Embodiments of the present invention further provide a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the monitoring device establishment according to any of the foregoing method embodiments is implemented. The steps of the method of connection.

Wherein, the storage medium may include: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other various storage media that can store program codes medium.

The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the various embodiments can be referred to each other.

The above description of the disclosed embodiments enables any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A method for a monitoring device to establish a connection, comprising:

receiving a connection request forwarded by a router through an internal port, wherein the connection request is sent to the router through an external port by a client, and the internal port and the external port have a mapping relation;

sending a response request corresponding to the connection request to the router through the internal port, so that the router forwards the response request to the client through the external port;

if other requests sent by the client are not received within a first preset time length after the response request is sent, canceling the mapping relation between the internal port and the external port at the router, and establishing the mapping relation between a standby port and the external port;

and sending the response request to the router through the standby port, so that the router forwards the response request to the client through the external port, and the monitoring device is connected with the client.

2. The method of claim 1, wherein receiving the connection request forwarded by the router through the internal port comprises:

and receiving an OPTIONS request for establishing RTSP connection forwarded by the router through the internal port.

3. The method of claim 1, wherein canceling the mapping between the internal port and the external port and establishing the mapping between the standby port and the external port at the router comprises:

sending a mapping relation canceling instruction to the router, wherein the mapping relation canceling instruction is used for canceling the mapping relation between the internal port and the external port;

and if receiving prompt information that the mapping relation cancellation sent by the router is successful, sending a mapping relation establishing instruction to the router, wherein the mapping relation establishing instruction is used for establishing the mapping relation between the standby port and the external port.

4. The method of claim 3, wherein sending the response request to the router through the backup port comprises:

and if receiving prompt information that the mapping relation is successfully established and sent by the router, sending the response request to the router through the standby port.

5. The method according to any one of claims 1 to 4, wherein if no other request sent by the client is received within a first predetermined time period after sending the response request, the method further comprises:

sending a keep-alive command to the client through the router;

judging whether a keep-alive response command forwarded by the client through the router is received within a second preset time length;

if yes, the step of canceling the mapping relation between the internal port and the external port and establishing the mapping relation between the standby port and the external port in the router is executed.

6. An apparatus for monitoring device connection establishment, comprising:

the system comprises a receiving module, a sending module and a receiving module, wherein the receiving module is used for receiving a connection request forwarded by a router through an internal port, the connection request is sent to the router through an external port by a client, and the internal port and the external port have a mapping relation;

a first sending module, configured to send a response request corresponding to the connection request to the router through the internal port, so that the router forwards the response request to the client through the external port;

a port replacement module, configured to cancel, at the router, a mapping relationship between the internal port and the external port and establish a mapping relationship between a standby port and the external port when the response request is sent within a first predetermined time period after the response request is sent and other requests sent by the client are not received;

and the second sending module is used for sending the response request to the router through the standby port so that the router forwards the response request to the client through the external port, and thus the connection between the monitoring device and the client is established.

7. The apparatus of claim 6, further comprising:

a third sending module, configured to send a keep-alive command to the client through the router;

the judging module is used for judging whether a keep-alive response command forwarded by the client through the router is received within a second preset time length;

the port replacement module is configured to cancel, at the router, the mapping relationship between the internal port and the external port and establish the mapping relationship between the standby port and the external port when a keep-alive response command forwarded by the client through the router is received within a second predetermined time period.

8. An electronic device, comprising:

a memory for storing a computer program;

a processor for implementing the steps of the method of establishing a connection by a monitoring device according to any of claims 1 to 5 when executing the computer program.

9. A connection establishment system, comprising: client, router, and electronic device according to claim 8.

10. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, which computer program, when being executed by a processor, carries out the steps of the method for a monitoring device to establish a connection according to one of claims 1 to 5.

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