JP2007172048A - Polling communication system and server system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a polling communication system and a server system for reducing a communication band necessary for polling communication even when the polling communication is performed by a plurality of devices. <P>SOLUTION: In this server system connected to a plurality of customer station equipment 1 for communicating with the plurality of customer station equipment 1, the customer station equipment 1 is usually distributed to a plurality of polling servers 5 and performs polling communication. When an event for transferring information with each customer station equipment 1 occurs, a center server 4 transmits the communication request of the customer station equipment 1 to the plurality of polling servers 5 (1), and when a question packet is transmitted to the polling server 5 by the customer station equipment 1 (2), the polling server 5 returns a reply packet showing that the center server communication request has been made (3). Thus, the customer station equipment 1 makes a packet request to the center server 4 (4), and the packet is transmitted from the center server 4 to the customer station equipment 1 (5). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a polling communication system and a server system in which a device is connected to a center server, and the device performs polling to confirm a communication request from the center server.

  Conventionally, as a means for grasping the states of a plurality of devices, a communication system including a polling server is known from Patent Document 1 below. This communication system is a system that controls and monitors a large number of control target devices with a center server. A gateway is provided between the large number of control target devices and the center server. In order to detect whether or not a monitoring request has occurred, the center server is polled via a gateway.

  In such a communication system, a system environment including a NAT router between a center server and a large number of devices to be controlled can be considered. In the system environment, only the NAT router can be recognized from the center server. And the control target device cannot communicate directly. Therefore, there is a need for polling communication in which the control target device provided with the NAT router inquires of the center server whether there is a control / monitoring request for itself.

Further, in a system in which a plurality of devices are controlled by a single center server, polling communication and control / monitoring of each device are performed by the single center server.
JP-A-2004-280717

  However, the above-described communication system needs to regularly communicate with a polling server even if it is a large number of devices that do not always need to communicate, and the number of devices connected to a single polling server is limited. As the number increases, the communication bandwidth required for the polling server increases, and the operation cost increases. Further, since communication is concentrated only on a part of communication lines connected to the polling server, it is necessary to introduce an expensive line multiplexing mechanism in preparation for a communication failure, which further increases the operation cost.

  Therefore, the present invention has been proposed in view of the above-described circumstances, and provides a polling communication system and a server system that can reduce the communication bandwidth necessary for the polling communication even when many devices perform the polling communication. For the purpose.

  A polling communication system according to the present invention transmits a question signal for polling communication, receives a response signal to the question signal, is connected to the plurality of devices, and exchanges information with each device. A center server that transmits a communication request for the device when an event to be performed occurs, and the center server that is connected to the plurality of devices and the center server and has not received a communication request from the center server. When a query signal inquiring whether there is a communication request is received from each device, a response signal indicating that there is no communication request of the center server for the device is returned to the device, and a communication request is received from the center server Is a response indicating that there is a communication request for the interrogation signal of the device. A plurality of polling servers that send back signals, and in order to solve the above-described problem, a plurality of polling servers receive the question signals transmitted from the plurality of devices, and the plurality of polling servers A response signal to the signal is returned to the device.

  The present invention is a server system that is connected to a plurality of devices and communicates with the plurality of devices, and transmits a communication request for the devices when an event for exchanging information with each device occurs. If a communication request is not received from the center server, a question signal for inquiring whether there is a communication request from the center server is received from each device, and a response signal indicating that there is no communication request from the center server for the device is received. A plurality of polling servers that return a response signal indicating that there is a communication request for the inquiry signal of the device when a communication request is received from the center server in response to the device. In order to solve the problem, the interrogation signal sent from each device is distributed and received by multiple polling servers. A response signal for the question signal by said plurality of polling server to reply to the device.

  According to the present invention, a plurality of polling servers are provided, and each in-home device performs polling communication with respect to the plurality of polling servers. Therefore, even if a large number of devices perform polling communication, the communication bandwidth necessary for the polling communication is increased. Can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  In the network communication system shown in FIG. 1, a plurality of in-home devices 1-1 to 1-N (hereinafter simply referred to as “in-home device 1” when collectively referred to) are connected to a network via a NAT (Network Address Translation) router 2. 3 and a single center server 4 and a plurality of polling servers 5-1 to 5-N (hereinafter collectively referred to simply as “polling server 5”) via the network 3 -1 to 1-N are controlled and monitored. The center server 4 and the polling server 5 correspond to a server system according to the present invention. Although not shown in FIG. 1, the center server 4 can also control and monitor the home device 1 in response to a request from a user terminal such as a personal computer or a mobile phone.

  This network communication system controls and monitors the home device 1 by the center server 4 using a device embedded network technology (EMIT (Embedded Micro Internetworking Technology), hereinafter referred to as EMIT technology). This EMIT technology incorporates EMIT middleware in a network device such as a user terminal, home device 1 or center server 4, and realizes communication connection by communication between the EMIT middleware.

  Although details will be described later, the center server 4 is provided with an OAS (Object Access Server) function unit 21 that performs routing processing between EMIT middleware, recognition processing of the home device 1, and the like. MOS (Micro Object Server) function units 11-1 to 11-N (hereinafter collectively referred to simply as “MOS function units”) that transmit and receive control signals of various home devices 1 and status signals of the home devices 1 between middlewares. 11 ”is implemented, and an OAL (Object Access Library) function unit (FIG. 11) outputs a control / monitoring request to the controlled home device 1 and displays the status of the home device 1 to the user terminal. (Not shown) is implemented.

  As shown in FIG. 1, in the network communication system, each home device 1 and a plurality of polling servers 5-5 are normally connected without communication from the OAS function unit 21 of the center server 4 to the MOS function unit 11 of the home device 1. Polling communication is performed with 1 to 5-N. This polling communication is performed in order to inquire at the home device 1 whether or not the OAS function unit 21 of the center server 4 is generating a communication request to the MOS function unit 11 of the home device 1.

  In this polling communication, when a question packet is transmitted from the home device 1 to the plurality of polling servers 5-1 to 5-N, a communication request is not transmitted from the center server 4 to the polling servers 5-1 to 5-N. The plurality of polling servers 5-1 to 5 -N returns a response packet including a notification that the communication request is not received from the network 3 to the home device 1.

  When an event is generated by the MOS function unit 11 of the home device 1, as shown in FIG. 2, the MOS function unit 11 of the home device 1 sends an event packet including an identifier of the event generated in the home to the center server. 4 to send. Thereby, the OAS function part 21 of the center server 4 recognizes the event occurrence recognized by the MOS function part 11 of the home appliance 1 by the event packet, and performs processing according to the event.

  Further, when it is necessary to communicate from the OAS function unit 21 of the center server 4 to the MOS function unit 11 of the in-home device 1, the center server 4 first requests the in-home device 1 for the center server communication as shown in FIG. 3. Is transmitted to the polling servers 5-1 to 5-N (1). This center server communication request is transmitted to all or some of the polling servers 5-1 to 5 -N among the plurality of polling servers 5-1 to 5 -N performing polling communication with the home device 1.

  Next, when the home device 1 transmits a question packet to the polling servers 5-1 to 5-N (2), the polling servers 5-1 to 5-N that have received the center server communication request receive communication requests from the center server. A response packet including that there is is returned to the home device 1 (3).

  Upon receiving this response packet, the MOS function unit 11 of the home appliance 1 transmits a request packet for requesting transmission of a packet related to the communication request to the OAS function unit 21 of the center server 4 (4), and the OAS of the center server 4 In response to receiving the request packet from the MOS function unit 11 of the home device 1, the function unit 21 transmits a response packet to the request packet to the MOS function unit 11 of the home device 1 (5). When receiving the response packet, the MOS function unit 11 of the home device 1 processes the response packet and performs operations related to control and monitoring. Here, the packet request from the MOS function unit 11 to the OAS function unit 21 and the transmission of the packet from the OAS function unit 21 to the MOS function unit 11 in response to the packet request are performed in accordance with OAP (Object Access Protocol) in EMIT middleware. It is.

  Further, the center server 4 transmits the response of the center server communication to the polling servers 5-1 to 5 -N that have transmitted the center server communication request last time at the same time when the transmission of the response packet to the home device 1 is completed. As a result, the polling server 5-1 to 5 -N returns a response packet including that there is no communication request from the center server to the home device 1 when the inquiry packet is next transmitted from the home device 1. become.

  In this manner, polling communication is performed between the home device 1 and the polling servers 5-1 to 5-N, and control and monitoring are performed between the MOS function unit 11 of the home device 1 and the OAS function unit 21 of the center server 4. In the network communication system that performs communication for the home appliance 1 and the center server 4 are configured as shown in FIG.

  Examples of the in-home device 1 include a temperature sensor in a house, a smoke sensor, a humidity sensor, an electric lock, a door phone, lighting, a security sensor, and the like. As shown in FIG. 4, in the home device 1, an application processing unit 12 and an interface module 13 are connected to a MOS function unit 11.

  For example, when the application processing unit 12 functions as a temperature sensor, an application code for acquiring a temperature value is stored, and the temperature value is held and transferred to the MOS function unit 11.

  The interface module 13 performs data link layer, network layer, and transport layer processing in an OSI (Open Systems Interconnection) reference model. For example, processing according to Ethernet (registered trademark) is performed in the data link layer, processing according to IP (Internet Protocol) is performed in the network layer, and processing according to TCP (Transmission Control Protocol) is performed in the transport layer. Capabilities such as a communication protocol version and a communication speed of the interface module 13 are stored in the capability table 14 and can be acquired by the OAS function unit 21 of the center server 4.

  The MOS function unit 11 functions as EMIT middleware between the application layer by the application processing unit 12 and the transport layer by the interface module 13. The MOS function unit 11 is given an object ID 11d by the OAS function unit 21 of the center server 4 in order to identify that the home device 1 is an object in EMIT. This object ID 11 d is stored in a packet transmitted to the center server 4 when communicating with the OAS function unit 21.

  The MOS function unit 11 performs an operation defined by a function 11a, an event 11b, and a variable 11c. The operation of the MOS function unit 11 is defined in the service table 11 e and can be acquired by the OAS function unit 21 of the center server 4.

  When the home device 1 is a temperature sensor, the function 11a is a temperature value output function, the event 11b is an event that outputs a temperature value when the temperature value is 10 degrees or less, for example, and the variable 11c is the temperature value itself. It becomes. Such a home device 1 generates an event at event 11b when the temperature value becomes 10 degrees or less, and outputs the temperature value of variable 11c by function 11a. In addition, when the home device 1 is a door phone, the MOS function unit 11 has a function 11a serving as an on / off state output function of a push button, an event 11b is, for example, an event that the push button is turned on, and a variable 11c is The push button is turned on or off.

  Further, the in-home device 1 may cause the MOS function unit 11 to generate an event for performing polling communication with the plurality of polling servers 5 to transmit a question packet from the communication module 23 and receive a response packet. 13 may perform polling communication with respect to a plurality of polling servers 5.

  The center server 4 controls and monitors the home equipment 1 such as a temperature sensor, a humidity sensor, an electric lock, a door phone, lighting, and a security sensor in the house. In the center server 4, a server function unit 22 and a communication module 23 are connected to the OAS function unit 21.

  The server function unit 22 performs overall control of the OAS function unit 21 and the communication module 23. The server function unit 22 creates a center server communication request and transmits it to the polling servers 5-1 to 5 -N when communicating with a certain home device 1.

  The communication module 23 communicates with the interface module 13 of the home appliance 1 and communicates with the polling servers 5-1 to 5-N. The communication module 23 performs processing of a data link layer, a network layer, and a transport layer in an OSI (Open Systems Interconnection) reference model. For example, processing according to Ethernet (registered trademark) is performed in the data link layer, processing according to IP (Internet Protocol) is performed in the network layer, and processing according to TCP (Transmission Control Protocol) is performed in the transport layer. When each of the in-home devices 1-1 to 1-N is configured with various interface modules 13, the communication module 23 is connected to the in-home information such as the communication protocol version and the communication speed for each in-home device 1 according to the control of the device access controller 21c. Communication processing corresponding to the capability of the device 1 is performed.

  The OAS function unit 21 functions as EMIT middleware between the processing of the server function unit 22 and the transport layer processing by the communication module 23. The OAS function unit 21 includes a device access server 21a, service information 21b stored in a predetermined memory, and a device access controller 21c.

  The device access server 21 a receives a request from the client via the communication module 23 and the server function unit 22 in order to perform communication with the client (OAL). The device access server 21a controls the operation of transmitting the request to the home device 1 via the device access controller 21c and the communication module 23. As a result, the device access controller 21c transmits a request from the client to the home device 1 to control the home device 1.

  The device access controller 21c acquires the interface definition and service information of the home devices 1-1 to 1-N via the communication module 23 and the service table 11e and the capability table 14 of the home devices 1-1 to 1-N. Search for. Thus, the device access controller 21c determines what service (function 11a, event 11b, variable 11c) each home device 1 has, and the correspondence between the object ID 11d of each home device 1 and the service list Is created. The device access controller 21c recognizes what capabilities (communication protocol version, communication speed) each home device 1 has.

  When an event occurs in the MOS function unit 11 and the event packet is received by the communication module 23, the device access controller 21c analyzes the event packet by the device access controller 21c and notifies the device access server 21a. Further, when a request from a client is transmitted to the in-home device 1, the MOS function unit 11 that can respond to the request is recognized with reference to the service information 21b. Then, the destination object ID 11 d is added to the request, and the packet is transmitted from the communication module 23 to the home device 1 in accordance with the capability of the home device 1.

  The OAS function unit 21 is given an object ID 21 d so that other EMIT middleware-compatible devices can identify the OAS function unit 21. This object ID 21d is stored in a packet to be transmitted when communicating with the MOS function unit 11 of the in-home device 1 or an EMIT middleware compatible device such as a client (personal computer) in which another OAL is mounted.

  In the network communication system including the in-home device 1 having the MOS function unit 11 and the center server 4 having the OAS function unit 21, as shown in FIG. When the communication request is not transmitted to 5-N, the household device 1 transmits a question packet to the plurality of polling servers 5-1 to 5-N. At this time, the in-home device 1 refers to a table showing the correspondence between the polling order as shown in FIG. 5 and the connection destination information of the plurality of polling servers 5-1 to 5-N as connection destinations. By making the table of FIG. 5 different for each of the in-home devices 1-1 to 1-N, the in-home devices 1-1 to 1-N perform polling communication with a combination of a plurality of polling servers 5 different from each other. become.

  For example, the home device 1 normally performs polling communication only with the polling server 5 with the polling order “1”, and when the polling communication with the polling server 5 fails, the polling server with the polling order “2” is used. The polling communication may be performed with the polling server 5 having the polling order “1” and the polling server 5 having the polling order “2” alternately distributed. Further, the in-home devices 1-1 to 1-N transmit the inquiry packets to the polling servers 5 that are different in time series according to predetermined rules with the plurality of polling servers 5-1 to 5-N that perform polling communication. May be.

  In contrast, the center server 4 includes a correspondence table between the home device 1 as shown in FIG. 6A and a polling server with which the home device 1 performs polling communication, and a polling as shown in FIG. A correspondence table between the server and connection destination information for connecting to the polling server is stored. When it is desired to communicate with a certain home device 1, the home device 1 transmits a center server communication request to any polling server 5 that performs polling communication. In addition, when the home device 1 performs polling communication with a plurality of polling servers 5-1 to 5-N according to a predetermined rule, the center server 4 can select any of the plurality of polling servers 5-1 to 5-N. A center server communication request is transmitted to the polling server 5.

  Further, even if the center server 4 is provided with a large number of polling servers 5-1 to 5-N, referring to the correspondence table shown in FIG. The center server communication request is transmitted only to the polling servers 5-1 to 5-N that perform the polling communication.

  As described above, according to the network communication system to which the present invention is applied, when there is no communication request from the center server 4 to the in-home devices 1-1 to 1-N, a plurality of in-home devices 1-1 to 1-N and By performing polling communication with the polling servers 5-1 to 5 -N, it is possible to avoid the polling communication from being concentrated on only a part of the network 3. Therefore, it is possible to suppress the operation cost without concentrating communication only on a part of the network 3 and increasing the communication band, and to introduce an expensive line multiplexing mechanism in preparation for a failure caused by the concentration of communication. Can be eliminated. Further, since there is no need to perform polling communication with respect to the center server 4, transmission of packets related to control / monitoring of the home device 1 is delayed due to an increase in bandwidth necessary for communication of the inquiry packet and response packet related to polling communication. Occurrence can also be prevented.

  In the example described above, the case where a plurality of polling servers 5 are provided has been described. However, if the configuration is such that there are a plurality of polling communication partners of the in-home device 1, the function of the polling server 5 is implemented in the center server 4. In addition, even if the single polling server 5 is provided, the communication band used for the polling communication of the home device 1 can be distributed to the center server 4 and the polling server 5.

  Each polling server 5 recognizes the communication band used by itself and, when the communication band becomes higher than a predetermined band, returns a response signal to the inquiry signal from the home device 1. You may restrict. When the reply of the response signal is limited in this way, the home device 1 determines that the polling communication with the polling server 5 has failed, and transmits a question signal to the other polling server 5.

  Next, another network communication system including the center server 4 and the polling server 5 to which the present invention is applied will be described. Of course, the description of the network communication system described below that is not described in the network communication system described above can be realized by the center server 4 and the home device 1 using the EMIT technology described above. .

  In this network communication system, as shown in FIG. 7, a center server 4 is connected to a mobile phone 30 as a user terminal and a plurality of polling servers 5-1 and 5-2. The polling servers 5-1 and 5-2 activate a CGI (Common Gateway Interface) that generates static content when an event for receiving a center server communication request from the center server 4 occurs, and the activated CGI With the ability to delete.

  The center server 4 includes a front-end server 41 that communicates with the mobile phone 30 via a general-purpose network N1 such as the Internet, a database 42, a back-end that communicates with the polling servers 5-1 to 5-N and the home device 1. And a server 43. The front end server 41, the database 42, and the back end server 43 have the same functions as the server function unit 22 described above.

  When the center server 4 receives a request to control / monitor a certain home device 1 from the mobile phone 30 via the general-purpose network N1, the center server 4 identifies the home device 1 to be controlled / monitored, and the database The polling server 5 with which the home device 1 performs polling communication is identified from the correspondence table between the home device 1 and the polling server 5 stored in 42. Then, the polling server 5 is caused to generate static content by transmitting a center server communication request to the polling server 5 identified from the database 42.

  In the example shown in FIG. 7, a request for controlling / monitoring the in-home device 1-2 is supplied from the mobile phone 30 to the front-end server 41, and the in-home device 1-2 statically sends a polling communication to the polling server 5-1. It shows how the content is generated. On the other hand, no static content is generated in the polling server 5-2 where the home device 1-3 performs polling communication.

  When generating static content, the polling server 5-1 includes a polling URL (Uniform Resource Locator) 51 that does not have static content and a URL 52 that has static content. Next, when the inquiry packet is supplied from the home device 1-2 to the polling server 5-1, a response packet indicating that there is static content is sent from the polling URL 52 including the static content to the home device 1-2. Send.

  As a result, the in-home device 1-2 communicates with the back-end server 43 (E-bus communication), and is controlled and monitored according to the request from the mobile phone 30.

  In such a network communication system, as shown in FIG. 8, at a normal time when a request is not requested from the mobile phone 30 to the front-end server 41, an http packet is sent from the home device 1-2 to the polling server 5-1 as a question packet. The head (S1) is transmitted and the polling server 5-1 returns HTTP not found (S2) of the port number “404” as a response packet because no static content is generated. Then, the in-home device 1-2 and the polling server 5-1 repeatedly transmit / receive the inquiry packet (S3) and the response packet (S4) at a predetermined polling communication interval (5 seconds).

  In step ST1, when an operation for controlling the home device 1-2 is performed on the WWW (World Wide Web) browser of the mobile phone 30, the mobile phone 30 controls the home device 1-2 to be controlled and the control. An HTTP request (S5) including the contents is transmitted to the front end server 41. The front-end server 41 transmits to the back-end server 43 a request (S6, Method Request) including the control target in-home device 1-2 and control content included in the HTTP request (S5). Referring to 42, the in-home device 1-2 identifies the polling server 5-1 performing the polling communication. Then, the back-end server 43 transmits a center server communication request, which is a command (Contents Create) for generating static content, to the polling server 5-1 whose control target is performing polling communication, to the polling server 5-1.

  In step ST2, the polling server 5-1 that has received the center server communication request activates a new CGI, generates static content, and constructs a polling URL 52. Next, when the inquiry packet (S8) is supplied from the home device 1-2 to the polling server 5-1, the polling URL 52 returns an HTTP response packet (S9) with the port number "200" to the home device 1-2. To do.

  Next, the in-home device 1-2 transmits a request packet (S10, Ebus polling) to the back-end server 43 of the polling server 5-1, and the back-end server 43 sends the front-end server to the in-home device 1-2 first. A request (S11, Method Request) having the same control content as the request (S6) received from 41 is transmitted. When this request (S11) is transmitted to the home device 1-2, the back-end server 43 sends a content deletion request (S12, Contents Delete) to the polling server 5-1 in order to delete the polling URL 52 of the polling server 5-1. Send.

  When the polling server 5-1 receives the content deletion request (S12), in step ST3, the polling URL 52 is deleted by ending the CGI activated in step ST2 and deleting the static content.

  Upon receipt of the request (S11), the in-home device 1-2 performs an operation according to the control content specified by the mobile phone 30, and in response to the completion of the operation, a response packet (including an operation result) S13, Method reply) is transmitted to the back-end server 43, and the back-end server 43 transmits a response packet (S14) to the front-end server 41. The front-end server 41 transmits the response packet (S15) to the mobile phone. 30. Thereby, in step ST4, the mobile phone 30 can perform a control operation result display indicating an operation result for the control content of the home device 1-2 and present the state of the home device 1-2 to the user.

  Thereafter, the in-home device 1-2 and the polling server 5-1 return to the normal processing, send the http head (S16, S17) from the in-home device 1-2 to the polling server 5-1, and the polling server 5- 1 repeats the process of returning “not found” (S18, S19) of the port number “404”.

  According to such a network communication system, similarly to the network communication system using the EMIT technology described above, the polling communication and the control / monitoring communication of the home device 1 are separated to increase the communication band necessary for the polling communication. You can avoid that.

  Furthermore, in this network communication system, when an event occurs in the home device 1 and the content of the event is notified from the home device 1 to the mobile phone 30, processing as shown in FIG. 9 is performed.

  First, at a normal time when no event occurs, the home device 1-2 and the polling server 5-1 transmit http head (S21, S23, S25) from the home device 1-2 to the polling server 5 to perform polling. When the server 5-1 repeats the process of returning “not found” (S 22, S 24, S 26) of the port number “404”, when the home device 1-2 detects an event (step ST 11), the home device 1-2 transmits an event packet (S27) including the contents of the event (fire) to the front-end server 41 using a line different from the line for the polling server 5-1.

  In response to this, the back-end server 43 returns a response packet (S30, Event reply) indicating that the event packet (S27, Event) has been received to the in-home device 1-2, and sends an event transfer packet ( S28, Event forward) is transmitted. In response to receiving the event transfer packet (S28), the front-end server 41 transmits a notification packet (S29, Event Mail) in a mail format that can notify the contents of the event to the mobile phone 30 to the mobile phone 30. The mobile phone 30 is displayed, for example, “Fire has occurred”.

  The above-described embodiment is an example of the present invention. For this reason, the present invention is not limited to the above-described embodiment, and various modifications can be made depending on the design and the like as long as the technical idea according to the present invention is not deviated from this embodiment. Of course, it is possible to change.

In the network communication system including a center server to which the present invention is applied and a plurality of polling servers, it is a system diagram for explaining processing at the time of communication when a communication request from the center server to a home device is not generated. It is a system figure explaining a process when an event generate | occur | produces in a household device in the network communication system containing the center server and the some polling server to which this invention is applied. In the network communication system including a center server to which the present invention is applied and a plurality of polling servers, it is a system diagram illustrating a process when a communication request from the center server to a home device occurs. It is an internal block diagram of a household device and a center server. It is a figure which shows the table which described the some polling server which performs the polling communication which a household device hold | maintains. It is a table held by the center server, where (a) shows the correspondence between the home device and the polling server, and (b) shows the correspondence between the polling server and the connection destination information of the polling server. It is a system diagram of another network communication system including a center server and a polling server to which the present invention is applied. FIG. 10 is a sequence diagram when controlling / monitoring a home device by a mobile phone in another network communication system including a center server and a polling server to which the present invention is applied. It is a sequence diagram when an event occurs in a home device in another network communication system including a center server and a polling server to which the present invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Home appliance 2 NAT router 3 Network 4 Center server 5 Polling server 11 MOS function part 11a Function 11b Event 11c Variable 11d Object ID
11e service table 12 application processing unit 13 interface module 14 capability table 21 OAS function unit 21a device access server 21b service information 21c device access controller 21d object ID
22 Server Function Unit 23 Communication Module 30 Mobile Phone 41 Front End Server 42 Database 43 Back End Server 51, 52 Polling URL

Claims (6)

A plurality of devices that transmit an interrogation signal for polling communication and receive a response signal to the interrogation signal;
A center server that is connected to the plurality of devices and that transmits a communication request for the device when an event occurs to exchange information with the devices;
When connected to the plurality of devices and the center server and not receiving a communication request from the center server, a question signal inquiring whether there is a communication request of the center server is received from each device, When a response signal indicating that there is no communication request of the center server is returned to the device and a communication request is received from the center server, a response signal indicating that there is a communication request for the inquiry signal of the device With multiple polling servers
A polling communication system, wherein the interrogation signals transmitted from the plurality of devices are distributed and received by a plurality of polling servers, and response signals to the interrogation signals are returned to the devices by the plurality of polling servers.   The polling communication system according to claim 1, wherein the device transmits an inquiry signal to some of the polling servers among all the polling servers.   The center server has a database in which a plurality of polling servers are assigned to each device, and refers to the database to transmit the communication request to any of the polling servers assigned to each device. The polling communication system according to claim 1. The device transmits a question signal to different polling servers in time series according to a predetermined rule set in advance,
The center server has, for each of the devices, a database in which a plurality of polling servers to which the device transmits an inquiry signal according to the predetermined rule is assigned, and any of the devices assigned to each device with reference to the database The polling communication system according to claim 1, wherein the communication request is transmitted to a polling server.   The polling communication system according to claim 1, wherein a plurality of polling servers are registered in the device as polling servers to which the inquiry signal is transmitted. A server system connected to a plurality of devices and communicating with the plurality of devices,
When an event for exchanging information with each device occurs, a center server that transmits a communication request for the device,
If no communication request has been received from the center server, a response signal indicating that there is no communication request from the center server for the device is received from each device asking for the presence or absence of the communication request from the center server. When a signal is returned to the device and a communication request is received from the center server, the device includes a plurality of polling servers that return a response signal indicating that there is a communication request for the question signal of the device,
A server system characterized in that interrogation signals transmitted from the plurality of devices are distributed and received by a plurality of polling servers, and response signals to the interrogation signals are returned to the devices by the plurality of polling servers.

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