CN106375453B - Bidirectional communication equipment, system and method based on HTTP connection - Google Patents
Bidirectional communication equipment, system and method based on HTTP connection Download PDFInfo
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- CN106375453B CN106375453B CN201610805452.6A CN201610805452A CN106375453B CN 106375453 B CN106375453 B CN 106375453B CN 201610805452 A CN201610805452 A CN 201610805452A CN 106375453 B CN106375453 B CN 106375453B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/02—Protocols based on web technology, e.g. hypertext transfer protocol [HTTP]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/14—Session management
- H04L67/141—Setup of application sessions
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Abstract
The invention relates to a two-way communication device, a system and a method based on HTTP connection, which aims to solve the problem of low-efficiency communication that the client can only send requests between devices based on HTTP connection; in the HTTP connection link, the first communication equipment is a client, and the second communication equipment is a server; in the reverse HTTP connection link, the second communication device is a client, and the first communication device is a server. The device needing communication is used as the client and the server at the same time, and both sides can actively send requests to each other, so that the low-efficiency communication mode that one device only serves as the client and continuously sends the requests to the server is changed.
Description
Technical Field
The invention relates to the field of communication of the Internet of things, in particular to bidirectional communication equipment, a system and a method based on HTTP connection.
Background
With the development of the internet of things, information exchange and communication between articles are more and more common. For devices communicating with each other, the control commands are usually a custom protocol based on a two-level system or a control protocol based on an HTTP single connection. The main disadvantages of the self-defined protocol are that the protocol is incompatible with the existing protocol, can not be controlled by the existing programs such as a browser, and has large development difficulty and easy error. On the other hand, although the control mode of the HTTP connection solves the problems of compatibility and browser control, the server cannot actively initiate a request due to the restriction that the client initiates a request and the server responds in the HTTP protocol, so that the server connected based on the HTTP protocol cannot actively push a state or send a command to the client. The client must constantly send a request to the server to inquire the state of the server, and then further operation for acquiring the server information can be completed. Such a request method seriously affects the working efficiency of the client.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides bidirectional communication equipment, a system and a method based on HTTP connection.
The technical scheme adopted by the invention for solving the technical problems is as follows: the controller is used for initiating an HTTP connection request to another communication device, receiving the HTTP connection request of the another communication device after an HTTP connection link is established with the another communication device, and establishing a reverse HTTP connection link with the another communication device.
The invention also provides communication equipment, which comprises a controller, wherein the controller is used for receiving the HTTP connection request of the other communication equipment, initiating the HTTP connection request to the other communication equipment after establishing the HTTP connection link with the other communication equipment, and establishing a reverse HTTP connection link with the other communication equipment.
The invention also provides a two-way communication system based on HTTP connection, which comprises a first communication device and a second communication device, wherein an HTTP connection link and a reverse HTTP connection link are established between the first communication device and the second communication device;
in the HTTP connection link, the first communication equipment is a client, and the second communication equipment is a server;
in the reverse HTTP connection link, the second communication device is a client, and the first communication device is a server.
Preferably, the establishment of the reverse HTTP connection link comprises the steps of:
the first communication equipment sends a connection request to the second communication equipment, enters a waiting state and waits for the confirmation of the second communication equipment;
the second communication equipment receives the connection request from the first communication equipment, sends confirmation information to the first communication equipment, enters a waiting state and waits for the first communication equipment to reply;
the first communication equipment receives the confirmation information from the second communication equipment, replies the confirmation information to the second communication equipment and establishes connection;
the second communication equipment receives the reply confirmation information from the first communication equipment and establishes connection;
the first communication equipment sends a reverse instruction to the second communication equipment;
the second communication device receives the reverse direction instruction.
Preferably, the establishment of the reverse HTTP connection link comprises the steps of:
the second communication equipment sends a connection request to the first communication equipment, enters a waiting state and waits for the confirmation of the first communication equipment;
the first communication equipment receives a connection request from the second communication equipment, sends confirmation information to the second communication equipment, enters a waiting state and waits for the second communication equipment to reply;
the second communication equipment receives the confirmation information from the first communication equipment, replies the confirmation information to the first communication equipment and establishes connection;
and the first communication equipment receives the reply confirmation information from the second communication equipment and establishes connection.
Preferably, in the HTTP connection link, the second communication device monitors a request sent by the first communication device to the second communication device by using a host port of the second communication device; in the reverse HTTP connection link, the first communication equipment monitors a request sent by the second communication equipment to the first communication equipment by adopting a host port of the first communication equipment.
Preferably, the request sent by the first communication device to the second communication device includes instruction information, and the second communication device operates according to the instruction information.
Preferably, the request sent by the second communication device to the first communication device includes device information and status information.
The invention also provides a method for establishing a two-way communication system, which comprises the following steps:
the first communication equipment actively initiates an HTTP connection request to the second communication equipment;
the second communication equipment receives the connection request and establishes HTTP connection with the first communication equipment;
the first communication equipment initiatively initiates an HTTP connection request and a reverse instruction aiming at the request to the second communication equipment again;
the second communication device receives the connection request and the reverse instruction to establish a reverse HTTP connection with the first communication device.
The invention also provides a method for establishing a two-way communication system, which comprises the following steps:
the first communication equipment actively initiates an HTTP connection request to the second communication equipment;
the second communication equipment receives the connection request and establishes HTTP connection with the first communication equipment;
the second communication equipment actively initiates an HTTP connection request to the first communication equipment;
the first communication equipment receives the connection request and establishes reverse HTTP connection with the second communication equipment.
Through the communication equipment, the system and the method, two HTTP connections can be established between two pieces of equipment needing communication, the equipment needing communication is simultaneously used as a client and a server based on the double HTTP connections, both sides can actively send requests to each other, and the low-efficiency communication mode that one piece of equipment can only be used as the client and continuously sends the requests to the server is changed.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic diagram of a two-way communication system based on HTTP connections;
FIG. 2 is a flow chart of one embodiment of a method for establishing a two-way communication system;
fig. 3 is a flow chart of another embodiment of a method for establishing a two-way communication system.
Detailed Description
Hereinafter, a bidirectional communication apparatus, system, and method based on HTTP connection according to the present invention will be described with reference to the accompanying drawings.
Generally, two nodes based on HTTP communication cannot implement real-time bidirectional communication, a default setting is that a client sends a data request to a server in real time and receives data fed back by the server in real time, and the server cannot send a request command to the client in real time to acquire information of the client and can only receive the data request sent by the client. Under the condition that the client needs to know the state of the server in real time, the client needs to send request data all the time, the server receives the request, calls related data according to the request command and sends the related data to the client. This greatly affects the working efficiency of the client. Therefore, a reverse HTTP connection needs to be established based on the default client sending a request to the server, that is, the device serving as the server actively sends a request to the device serving as the client.
The invention provides a communication device, which comprises a controller, wherein the controller is used for initiating an HTTP connection request to another communication device, receiving the HTTP connection request of the other communication device after establishing an HTTP connection link with the other communication device, and establishing a reverse HTTP connection link with the other communication device.
The invention also provides a communication device, which comprises a controller, wherein the controller is used for receiving the HTTP connection request of another communication device, initiating the HTTP connection request to the another communication device after establishing the HTTP connection link with the another communication device, and establishing a reverse HTTP connection link with the another communication device.
Specifically, HTTP connection is an application built on top of TCP protocol. In the HTTP connection link and the reverse HTTP connection link, the client is actively initiated to send the request, and the server is used for receiving the request. The specific steps of establishing the TCP connection between the client and the server are as follows:
a1: the client SENDs a SYN packet to the server, enters a SYN _ SEND (SYN ═ j) state, and waits for the server to confirm;
a2: the server receives the SYN packet, must send the reply ACK (ACK ═ j +1) of SYN of the acknowledgement client, produce a SYN packet (SYN ═ k) by oneself at the same time, namely reply SYN + ACK packet to the client, the server enters into SYN _ RECV state after finishing sending;
a3: the client receives a SYN + ACK packet replied by the server, sends an acknowledgement packet ACK (ACK is k +1) to the server and enters an ESTABLISHED state;
a4: the server receives an ACK (acknowledgement) packet sent back by the client and enters an ESTABLECHED state;
a5: the server listens for HTTP requests from the client using the default port.
The value in the above-mentioned transmission packet is equal to the transmission sequence number +1 of the sender, i.e. the next sequence number that the receiver expects to receive. The corresponding state change of the client is as follows: CLOSED- > SYN-SENT- > eatableshed,
the corresponding state change of the server is as follows: : CLOSED- > LISTEN- > SYN-RCVD- > EATABLISHED. Wherein the meaning of each state is: LISTEN-LISTEN for connection request from remote TCP port, SYN-send-wait for matching connection request after sending connection request; SYN-RCVD-waits for the confirmation of the connection request after receiving and sending a connection request; EATABLISHED represents an open connection for data transfer; CLOSED-no connection state.
And in the two communication devices establishing the two-way communication according to the steps, each communication device is a client and a server. Each device can send a request to the other side in real time, and real-time two-way communication is achieved. The communication mode between the client and the corresponding server in the HTTP connection link and the reverse HTTP connection link is as follows:
b1: the client issues an HTTP request message containing a pathname, such as a GET request or a CONNECT request, via a server associated with the TCP connection that identifies the client request and the server's local socket (a combination of source and destination IP addresses, source and destination port numbers).
B2: the server receives the request message sent by the client through the local socket associated with the TCP connection, takes out the object from the memory or the hard disk of the server host according to the message, and sends out the response message containing the object through the same socket.
B3: the client receives the response message sent by the server through the same socket.
The communication equipment can establish two HTTP connections between two pieces of equipment needing to communicate, and based on the double HTTP connections, the equipment needing to communicate can be used as a client and a server at the same time, and both sides can actively send requests to each other, so that the low-efficiency communication mode that one piece of equipment can only be used as the client and continuously sends the requests to the server is changed.
The invention also provides a two-way communication system based on HTTP connection, which comprises a first communication device and a second communication device, wherein an HTTP connection link and a reverse HTTP connection link are established between the first communication device and the second communication device; in the HTTP connection link, the first communication equipment is a client, and the second communication equipment is a server; in the reverse HTTP connection link, the second communication device is a client, and the first communication device is a server.
The establishment of the HTTP connection link of the two-way communication system comprises the following steps:
the first communication equipment sends a connection request to the second communication equipment, enters a waiting state and waits for the confirmation of the second communication equipment;
the second communication equipment receives the connection request from the first communication equipment, sends confirmation information to the first communication equipment, enters a waiting state and waits for the second communication equipment to reply;
the first communication equipment receives the confirmation information from the second communication equipment, replies the confirmation information to the second communication equipment and establishes connection;
and the second communication equipment receives the reply confirmation information from the first communication equipment and establishes connection.
A first embodiment of the reverse HTTP connection link establishment for a two-way communication system comprises the steps of:
the second communication equipment sends a connection request to the first communication equipment, enters a waiting state and waits for the confirmation of the first communication equipment;
the first communication equipment receives a connection request from the second communication equipment, sends confirmation information to the second communication equipment, enters a waiting state and waits for the second communication equipment to reply;
the second communication equipment receives the confirmation information from the first communication equipment, replies the confirmation information to the first communication equipment and establishes connection;
and the first communication equipment receives the reply confirmation information from the second communication equipment and establishes connection.
Specifically, the step of establishing the TCP connection between the first communication device and the second communication device in the HTTP connection link and the reverse HTTP connection link is the same as the step of connecting the client and the server in the steps a1 to a 5.
A second embodiment of the reverse HTTP connection link establishment for a two-way communication system comprises the steps of:
the first communication equipment sends a connection request to the second communication equipment, enters a waiting state and waits for the confirmation of the second communication equipment;
the second communication equipment receives the connection request from the first communication equipment, sends confirmation information to the first communication equipment, enters a waiting state and waits for the first communication equipment to reply;
the first communication equipment receives the confirmation information from the second communication equipment, replies the confirmation information to the second communication equipment and establishes connection;
the second communication equipment receives the reply confirmation information from the first communication equipment and establishes connection;
the first communication equipment sends a reverse instruction to the second communication equipment;
the second communication device receives the reverse direction command.
Specifically, the process of establishing the connection between the first communication device and the second communication device in the second embodiment of establishing the reverse HTTP connection link is slightly different from the process of connecting the client and the server in the steps a1 to a5, and the specific implementation steps are as follows:
c1: the client SENDs a SYN packet to the server, enters a SYN _ SEND (SYN ═ i) state and waits for the server to confirm;
c2: the server receives the SYN packet, must send the reply ACK (ACK ═ i +1) of SYN of the acknowledgement client, produce a SYN packet (SYN ═ l) by oneself at the same time, namely reply SYN + ACK packet to the client, the server enters into SYN _ RECV state after finishing sending;
c3: the client receives a SYN + ACK packet replied by the server, sends an acknowledgement packet ACK (ACK ═ l +1) to the server and enters an ESTABLISHED state;
c4: the server receives an ACK (acknowledgement) packet sent back by the client and enters an ESTABLECHED state;
c5: the client sends a reverse instruction to the server;
c6: the server receives a reverse instruction;
c7: the client uses a default port to listen to the HTTP request from the server, i.e. the client acts as the server and the server acts as the client.
In the bidirectional communication system, in the HTTP connection link, the first communication device is a client, and the second communication device is a server. The second communication equipment monitors the request sent by the first communication equipment to the second communication equipment by adopting a host port of the second communication equipment. In the reverse HTTP connection link, the first communication device is a server, and the second communication device is a client. The first communication equipment monitors a request sent by the second communication equipment to the first communication equipment by adopting a host port of the first communication equipment. The specific communication manner between the client and the corresponding server in the HTTP connection link and the reverse HTTP connection link is the same as the above steps B1 to B3.
Further, the request sent by the first communication device to the second communication device includes instruction information, and the second communication device operates according to the instruction information.
Further, the request sent by the second communication device to the first communication device includes device information and status information.
Through the communication system, two HTTP connections can be established between two devices needing to communicate, based on the double HTTP connections, the devices needing to communicate can be used as a client and a server at the same time, both sides can actively send requests to the other side, and the low-efficiency communication mode that one device can only be used as the client and continuously sends requests to the server is changed.
As shown in fig. 2, according to the establishment procedure of the bidirectional communication system, the present invention further provides a method for establishing a bidirectional communication system, comprising the following steps:
s11: the first communication equipment actively initiates an HTTP connection request to the second communication equipment;
s12: the second communication equipment receives the connection request and establishes HTTP connection with the first communication equipment;
s13: the first communication equipment initiatively initiates an HTTP connection request and a reverse instruction aiming at the request to the second communication equipment again;
s14: the second communication device receives the connection request and the reverse instruction to establish a reverse HTTP connection with the first communication device.
As shown in fig. 3, according to the establishment procedure of the bidirectional communication system, the present invention further provides a method for establishing a bidirectional communication system, comprising the following steps:
s21: the first communication equipment actively initiates an HTTP connection request to the second communication equipment;
s22: the second communication equipment receives the connection request and establishes HTTP connection with the first communication equipment;
s23: the second communication equipment actively initiates an HTTP connection request to the first communication equipment;
s24: the first communication equipment receives the connection request and establishes reverse HTTP connection with the second communication equipment.
By the method for establishing the two-way communication system, two HTTP connections can be established between two devices needing to communicate, based on the two HTTP connections, the devices needing to communicate can be simultaneously used as a client and a server, both sides can actively send requests to each other, and the low-efficiency communication mode that one device can only be used as the client and continuously sends the requests to the server is changed.
The two-way communication method is described below by taking the communication between the mobile phone and the smart speaker as an example. Assume that the IP address of the handset is 192.168.1.200 and the IP address of the smart speaker is 192.168.1.100. The mobile phone and the sound box are connected to the Internet through a wireless local area network. The user inputs an HTTP request message containing a path in a mobile phone browser: http://192.168.1.100/Connect, after the browser obtains the IP address, initiating HTTP connection to the smart speaker, establishing HTTP connection between the mobile phone and the smart speaker, connecting the mobile phone as a client based on HTTP, using the smart speaker as a server, and monitoring a request message from the mobile phone by the smart speaker. The user inputs the HTTP request message containing the path again in the mobile phone browser: http:// 192.168.1.100/Reverse. And after the browser obtains the IP address, initiating reverse HTTP connection, and establishing reverse HTTP connection between the mobile phone and the intelligent sound box. Based on the reverse HTTP connection, the loudspeaker box serves as a client side, the mobile phone serves as a server, and the mobile phone monitors request messages from the smart loudspeaker box.
After the two connections are established, the mobile phone sends a request to the smart sound box through HTTP connection: http://192.168.1.100/Play/Song/1000, meaning of this command: the mobile phone informs the sound box to start playing the song with the ID of 1000. The intelligent sound box receives a command request sent by the mobile phone and executes the command, and plays the song with the ID of 1000.
When the mobile phone needs to know whether the smart sound box plays the song, the mobile phone does not need to send a request to the smart sound box again, and waits for receiving a smart sound box identification request and feeding back a report. After the smart speaker executes the command, the smart speaker starts playing the song with the ID of 1000. Since a reverse HTTP connection has been established between the handset and the smart speaker, the handset uses a default port to listen for requests from the smart speaker. Therefore, the smart sound box actively sends a request to the mobile phone through the reverse HTTP connection: http://192.168.1.200/OnPlay/Song/1000 to inform the mobile phone that the smart sound box is playing. The mobile phone receives request information actively sent by the intelligent sound box through reverse HTTP connection and displays corresponding playing information.
By the communication method, two HTTP connections can be established between two devices needing to communicate, based on the double HTTP connections, the devices needing to communicate can be used as a client and a server at the same time, both sides can actively send requests to the other side, and the low-efficiency communication mode that one device can only be used as the client and continuously sends requests to the server is changed.
It is to be understood that the foregoing examples, while indicating the preferred embodiments of the invention, are given by way of illustration and description, and are not to be construed as limiting the scope of the invention; it should be noted that, for those skilled in the art, the above technical features can be freely combined, and several changes and modifications can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention; therefore, all equivalent changes and modifications made within the scope of the claims of the present invention should be covered by the claims of the present invention.
Claims (9)
1. A communication device, comprising a controller, wherein the controller is configured to initiate an HTTP connection request to another communication device, receive the HTTP connection request of the another communication device after establishing an HTTP connection link with the another communication device, and establish a reverse HTTP connection link with the another communication device, so that the another communication device can actively initiate the HTTP connection request after establishing the HTTP connection link with the another communication device; wherein the other communication device can actively initiate the request.
2. A communication device, comprising a controller, wherein the controller is configured to receive another communication device HTTP connection request, initiate the HTTP connection request to the another communication device after establishing an HTTP connection link with the another communication device, and establish a reverse HTTP connection link with the another communication device, so as to actively initiate the request to the another communication device, so that after the controller receives the HTTP connection request from the another communication device and establishes the HTTP connection link with the another communication device, the controller actively initiates the HTTP connection request to the another communication device.
3. A two-way communication system based on HTTP connection comprises a first communication device and a second communication device, and is characterized in that an HTTP connection link and a reverse HTTP connection link are established between the first communication device and the second communication device;
in the HTTP connection link, the first communication equipment is a client, and the second communication equipment is a server;
in the reverse HTTP connection link, the second communication device is a client, and the first communication device is a server; the client can actively initiate a request to the server;
the establishment of the reverse HTTP connection link comprises the steps of:
the first communication equipment sends a connection request to the second communication equipment, enters a waiting state and waits for the confirmation of the second communication equipment;
the second communication equipment receives the connection request from the first communication equipment, sends confirmation information to the first communication equipment, enters a waiting state and waits for the first communication equipment to reply;
the first communication equipment receives the confirmation information from the second communication equipment, replies the confirmation information to the second communication equipment and establishes connection;
the second communication equipment receives the reply confirmation information from the first communication equipment and establishes connection;
the first communication equipment sends a reverse instruction to the second communication equipment;
the second communication equipment receives the reverse instruction; or
After the first communication equipment establishes connection with the second equipment, the second communication equipment initiatively initiates a connection request.
4. A two-way communication system according to claim 3, wherein the establishment of the reverse HTTP connection link comprises the following steps:
the second communication equipment sends a connection request to the first communication equipment, enters a waiting state and waits for the confirmation of the first communication equipment;
the first communication equipment receives a connection request from the second communication equipment, sends confirmation information to the second communication equipment, enters a waiting state and waits for the second communication equipment to reply;
the second communication equipment receives the confirmation information from the first communication equipment, replies the confirmation information to the first communication equipment and establishes connection;
and the first communication equipment receives the reply confirmation information from the second communication equipment and establishes connection.
5. The communication system according to claim 3, wherein in the HTTP connection link, the second communication device uses the host port of the second communication device to monitor the request sent by the first communication device to the second communication device; in the reverse HTTP connection link, the first communication equipment monitors a request sent by the second communication equipment to the first communication equipment by adopting a host port of the first communication equipment.
6. The communication system of claim 5, wherein the request sent by the first communication device to the second communication device comprises command information, and the second communication device operates according to the command information.
7. The communication system of claim 5, wherein the request sent by the second communication device to the first communication device comprises device information and status information.
8. A method of establishing a two-way communication system according to claim 3, comprising the steps of:
the first communication equipment actively initiates an HTTP connection request to the second communication equipment;
the second communication equipment receives the connection request and establishes HTTP connection with the first communication equipment;
the first communication equipment initiatively initiates an HTTP connection request and a reverse instruction aiming at the request to the second communication equipment again;
the second communication equipment receives the connection request and the reverse instruction and establishes reverse HTTP connection with the first communication equipment; or the like, or, alternatively,
after an HTTP connection link is established between the first equipment and the second equipment, the second equipment actively initiates an HTTP connection request;
the second communication device can actively initiate a request to the first communication device.
9. A method of establishing a two-way communication system according to claim 3, comprising the steps of:
the first communication equipment actively initiates an HTTP connection request to the second communication equipment;
the second communication equipment receives the connection request and establishes HTTP connection with the first communication equipment;
the second communication equipment actively initiates an HTTP connection request to the first communication equipment;
the first communication equipment receives the connection request and establishes reverse HTTP connection with the second communication equipment;
therefore, after the HTTP connection link is established between the first equipment and the second equipment, the second equipment can actively initiate an HTTP connection request;
the second communication device can actively initiate a request to the first communication device.
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| CN107087037A (en) * | 2017-06-30 | 2017-08-22 | 郑州云海信息技术有限公司 | A kind of REST active push method and device |
| CN108600204A (en) * | 2018-04-11 | 2018-09-28 | 浙江大学 | A kind of corporate intranet access method based on Opposite direction connection and application layer tunnel |
| CN110830541B (en) * | 2018-08-14 | 2021-07-16 | 华为技术有限公司 | Message processing method, device and system |
| CN113612628B (en) * | 2021-07-09 | 2023-04-18 | 苏州浪潮智能科技有限公司 | Method and system for realizing self-adaptive cross-network-segment bidirectional communication |
| CN113625795A (en) * | 2021-10-12 | 2021-11-09 | 南京诺丹工程技术有限公司 | Environmental pressure monitoring platform and method |
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