JP5405617B2 - Mobile communication terminal and program - Google Patents

Description

  The present invention relates to a technique for operating an electrical device remotely from a mobile communication terminal.

  Inside the building of the user's home or office (hereinafter referred to as “home”), various electrical devices are connected via a LAN (Local Area Network) or a network attached thereto, and the user moves a mobile phone or tablet terminal. A technique of remotely operating an electrical device via a LAN using a communication terminal is known (for example, Patent Document 1). FIG. 1 shows an example of the configuration of this type of technology. In FIG. 1, a mobile communication terminal 20 includes, for example, various mobile communications compliant with LTE (Long Term Evolution), so-called 3G, or GSM (registered trademark) (Global System for Mobile Communications), and so-called wireless such as IEEE802.11n. Communication conforming to the LAN standard is performed. In the home, a LAN including various devices in addition to the home control device 40 is constructed. The in-home control device 40 controls various electrical devices 30 via the control adapter 50 using, for example, radio conforming to ZigBee (registered trademark). The router 70 communicates with the home control device 40 connected via a LAN, and also communicates with the mobile communication terminal 20 using a wireless LAN communication method. The user can remotely control the electrical device 30 in the home from outside the home via the mobile communication network 10 and the Internet 60 using the mobile communication terminal 20, or without using the mobile communication network 10 and the Internet 60. It is also possible to remotely control electric appliances in the home via a wireless LAN.

  By the way, in recent years, the communication speed of the mobile communication network 10 has been increased. However, for example, the communication speed in the wireless LAN compliant with IEEE802.11n is faster than the communication speed in the mobile communication network compliant with 3G, for example. . Due to the difference in communication speed, the user performs, for example, WEB browsing via the mobile communication network 10 when outside the home, but performs WEB browsing via the wireless LAN when the user is at home. There are times when it is used properly.

  Here, the procedure for remotely operating the electric device 30 starts when the mobile communication terminal 20 starts the application program for remote operation of the electric device 30 and then accesses the home control device 40. A communication address that is a destination when the mobile communication terminal 20 accesses the in-home control device 40 via the mobile communication network 10 is held in the mobile communication terminal 20 by a so-called bookmark function. This communication address is called an access destination URL (Uniform Resource Locator). This access destination URL is converted into a global IP (Internet Protocol) address (WAN (Wide Area Network) side IP address) assigned to the router 70 by DNS (Domain Name System). When the mobile communication terminal 20 accesses the router 70 with this global IP address as the destination, this access is routed to the home control device 40 by the NAPT (Network Address Port Translation) function of the router 70. The NAPT function is a function for converting a global IP address and a local IP address (private IP address) in order to route access from the WAN side to the LAN side. Thereafter, screen data for displaying a screen as illustrated in FIG. 6 is transmitted from the home control device 40 to the mobile communication terminal 20. The user performs an operation on the desired electrical device 30 on this screen.

  On the other hand, the communication address that is the destination when the mobile communication terminal 20 accesses the home control device via the wireless LAN is a local IP address assigned to the home control device 40 in this wireless LAN. In this case, address conversion by the NAPT function is not performed. Thereafter, similarly to the above example, screen data for displaying the screen of FIG. 6 is transmitted from the home control device 40 to the mobile communication terminal 20, and the user operates the desired electrical device 30 on this screen. I do.

  Now, a case is assumed where the mobile communication terminal 20 tries to access the home control device 40 from the home via the wireless LAN in a state where the access destination URL of the home control device 40 is held by the bookmark function described above. Since this access destination URL is also converted by DNS into the global IP address of the router 70, the mobile communication terminal 20 first accesses the router. However, since this access is from a communication node inside the wireless LAN, the NAPT function of the router 70 does not work. As a result, the mobile communication terminal 20 is regarded as an access to the router itself, and is not routed from the router 70 to the home control device 40. In this case, in the mobile communication terminal 20, not only the screen as shown in FIG. 6, but various setting screens in the router 70 and a screen indicating that connection is impossible are displayed, and the home control device 40 cannot be accessed. .

JP 2001-256156 A

  Therefore, only when the mobile communication terminal 20 is in the home, the user operates the mobile communication terminal 20 to instruct to access the local IP address of the home control device 40 instead of the access destination URL of the home control device 40. A solution is possible. However, this method has a problem that the user has to instruct the mobile communication terminal 20 each time for a different communication address depending on whether or not he / she is in the house, which is troublesome.

  In addition, when a global IP address assigned to the router 70 is accessed from a communication node inside the wireless LAN, a new routing rule is set in the router 70 so as to route to the home control device 40 by the NAPT function. A method is also conceivable. However, in this method, there is a problem that a router capable of performing such a special setting must be developed, and the same setting must be performed every time the user newly replaces the router. In particular, the user has some opportunity to perform the setting work when starting to use the router, and does not touch the router during the normal use period and is basically unfamiliar with the handling of the router, so this method imposes a burden on the user. Is considered large.

  As another method, another global IP address is prepared and the router 70 is accessed from the global IP address via the proxy server device. However, such a method is difficult for a user who is not familiar with communication technology.

  Therefore, the present invention makes it easier for a user to remotely operate an electric device regardless of whether the user is present or not at a location where the LAN including the electric device to be remotely operated is installed. The purpose is to be able to.

In order to achieve the above object, the present invention provides a router connected via a LAN to a control device that controls an electrical device, first wireless communication means for communicating via a WAN, and first router for communicating with the router. Two wireless communication means, an access destination address which is a communication address assigned to the control device in the WAN, a local address which is a communication address assigned to the control device in the LAN, and the router Storage means for storing an identifier assigned to the router for communicating with the communication means, and an identifier assigned to the router that is a communication partner of the second wireless communication means are stored in the storage means. when matching the identifiers are the the local address performed first communication destined using the second wireless communication unit, In cases other than that performs a second communication with the access destination address by using the first radio communication means or the second wireless communication means as a destination, to the second communication from the first communication When switching and when switching from the second communication to the first communication, the information regarding the communication session with the control device before the switching is used after the switching, and the control device There is provided a mobile communication terminal comprising a communication control means for performing communication.

  The communication performed by the second wireless communication unit with the router may be communication based on a wireless LAN standard, and the identifier assigned to the router may be an SSID (Service Set Identifier).

  The communication control unit acquires an SSID of the router that is a communication partner of the second wireless communication unit using an interface related to connection in a wireless LAN, and compares the SSID with the identifier stored in the storage unit You may do it.

  Using the second wireless communication means, an address acquisition is performed for transmitting a request for the local address assigned to the control device and receiving the local address transmitted from the control device in response to the request. The storage means may store the local address acquired by the address acquisition means.

The present invention also includes a router connected via a LAN to a control device that controls an electrical device, a first wireless communication unit that communicates via a WAN, and a second wireless communication unit that communicates with the router. A computer having an access destination address that is a communication address assigned to the control device in the WAN, a local address that is a communication address assigned to the control device in the LAN, and the router that performs the second wireless communication. Storage means for storing an identifier assigned to the router to communicate with the means, and an identifier assigned to the router that is a communication partner of the second wireless communication means is stored in the storage means when matching the identifier, performs a first communication to the local address and the destination by using the second wireless communication means Otherwise, the said access address using the first radio communication means or the second wireless communication means performs the second communication destined, the first from the communication the second to the communication When switching and when switching from the second communication to the first communication, the information regarding the communication session with the control device before the switching is used after the switching, and the control device A program for causing communication to function as communication control means is provided.

  According to the present invention, even when a user is present or not at a location where a LAN including an electrical device to be remotely operated is installed, the user can remotely operate the electrical device more easily. become able to.

It is a block diagram which shows the structure of the communication system which concerns on embodiment of this invention. It is a block diagram which shows the hardware constitutions of the mobile communication terminal which concerns on the same embodiment. It is a block diagram which shows the function structure of the mobile communication terminal. It is a flowchart which shows operation | movement of the mobile communication terminal. It is a flowchart which shows operation | movement of the mobile communication terminal. It is a figure which shows an example of the screen displayed on the mobile communication terminal.

(Constitution)
FIG. 1 is a block diagram showing a configuration of a communication system 1 according to an embodiment of the present invention. The mobile communication network 10 is, for example, a network that is compliant with LTE, so-called 3G, or GSM (registered trademark). The mobile communication network 10 is connected to the Internet 60 via gateway equipment (not shown). A LAN including a home control device 40 and the like is built in a user's home or office. The home control device 40 performs wireless communication with the control adapter 50 in accordance with ZigBee (registered trademark), which is one of the short-range wireless communication standards. Each control adapter 50 is connected to the electrical device 30 on a one-to-one basis, and instructs the electrical device 30 to perform an operation to be performed by the electrical device 30 based on data wirelessly transmitted from the home control device 40. The router 70 connects the Internet 60 and the LAN. The router 70 also has a wireless LAN function, and communicates with the home control device 40 and the like connected via the LAN, and also communicates with the mobile communication terminal 20 in accordance with a so-called wireless LAN standard such as IEEE802.11n. I do. The mobile communication terminal 20 is a mobile phone or a tablet terminal, and can perform communication via the mobile communication network 10 and communication via a wireless LAN. A user can remotely operate the electric device 30 using the mobile communication terminal 20 via the mobile communication network 10 and the Internet 60, or can remotely operate the electric device 30 via a wireless LAN.

  A global IP address is assigned to the router 70 as the WAN-side IP address. The home control device 40 is assigned an access destination URL on the Internet 60 and a local IP address on the LAN. The mobile communication terminal 20 accesses the access destination URL assigned to the in-home control device 40 when remotely operating the electric device 30 from outside the house. This access destination URL is converted into a global IP address assigned to the router 70 by DNS. When the mobile communication terminal 20 accesses the router 70 with this global IP address as the destination, this access is routed to the home control device 40 by the NAPT function of the router 70. On the other hand, when the mobile communication terminal 20 remotely operates the electrical device 30 in the home, the mobile communication terminal 20 accesses the local IP address assigned to the home control device 40.

  In both cases of access from outside the house and access from within the house, screen data for displaying the operation screen is transmitted from the home control device 40 to the mobile communication terminal 20. The user selects a desired electrical device 30 on this screen, and further performs an operation for designating the operation of the electrical device 30. An instruction corresponding to this operation is transmitted from the mobile communication terminal 20 to the home control device 40 via the router 70. The in-home control device 40 wirelessly transmits data indicating the above instruction to the control adapter 50 corresponding to the electrical device 30 selected by the user. The control adapter 50 instructs the electrical device 30 to perform an operation to be performed by the electrical device 30 based on data wirelessly transmitted from the home control device 40. The electric device 30 operates according to the instruction.

  FIG. 2 is a block diagram showing a hardware configuration of the mobile communication terminal 20, and here, a case where the mobile communication terminal 20 is a mobile phone is illustrated. The mobile communication terminal 20 includes a control unit 21, a storage unit 22, a first wireless communication unit 23, a voice input / output unit 24, an operation unit 25, a display unit 26, and a second wireless communication unit 27. Computer. The control unit 21 includes an arithmetic device such as a CPU (Central Processing Unit) and a storage device such as a ROM (Read Only Memory) and a RAM (Random Access Memory). The CPU controls the operation of each unit of the mobile communication terminal 20 by executing a program stored in the ROM or the storage unit 22 using the RAM as a work area. The first wireless communication unit 23 includes a wireless antenna and a communication circuit, and performs wireless communication with a base station of the mobile communication network 10. The voice input / output unit 24 includes a speaker, a microphone, a voice processing circuit, and the like, and performs voice input / output related to a call. The operation unit 25 includes operation elements such as a plurality of keys and touch sensors, and supplies an operation signal corresponding to a user operation to the control unit 21. The control unit 21 performs processing according to the operation signal. The display unit 26 includes a liquid crystal panel and a liquid crystal driving circuit, and displays an image according to an instruction from the control unit 21. The second wireless communication unit 27 includes a wireless antenna and a communication circuit, and performs wireless communication with the router 70.

  The storage unit 22 is a writable nonvolatile storage means such as an EEPROM (Electronically Erasable and Programmable ROM) or an SRAM (Static Random Access Memory) equipped with a backup power source. In addition to an application program executed in a computer environment called Android (registered trademark), the storage unit 22 has an access destination URL, a local IP address, and an SSID (identifier assigned to a router in a wireless LAN). Service Set Identifier) is stored. The access destination URL is set by an application program for remote operation of the electrical device 30. The SSID is the SSID of the router 70 installed in the user's own home (that is, the router 70 in the LAN to which the electric device 30 that the user wants to remotely operate) belongs to the user. This SSID may be input by the user to the mobile communication terminal 20 using the operation unit 25, or may be acquired actively by the mobile communication terminal 20. The local IP address may be one that the user has input to the mobile communication terminal 20 using the operation unit 25, or may be one that is actively acquired by the mobile communication terminal 20, but in this embodiment, An example in which the mobile communication terminal 20 actively acquires will be described.

  FIG. 3 is a block diagram showing a functional configuration of the mobile communication terminal 20. The mobile communication terminal 20 includes a first wireless communication unit 23, a second wireless communication unit 27, an address acquisition unit 210, a storage unit 22, and a communication control unit 220. The address acquisition unit 210 and the communication control unit 220 are realized by the control unit 21 (FIG. 2). The first wireless communication unit 23 communicates with the router 70 via the Internet 60 that is a WAN. The second wireless communication unit 27 may communicate with the router 70 via the Internet 60 that is a WAN, or may communicate with the router 70 without passing through the Internet 60 that is a WAN.

  The address acquisition unit 210 uses the second wireless communication unit 27 to transmit a request for requesting a local address assigned to the home control device 40 (control device), and transmits the request from the home control device 40 in response to the request. The received local IP address (local address) is received.

  The storage unit 22 is assigned an access destination address, which is a communication address assigned to the home control device 40 (control device) in the Internet 60 as a WAN, and is assigned to the home control device 40 (control device) in the LAN. The local IP address (local address) which is the communication address acquired by the above and the SSID which is the identifier assigned to the router 70 so that the router 70 communicates with the second wireless communication unit 27 are stored.

  When the SSID that is the identifier assigned to the router 70 that is the communication partner of the second wireless communication unit 27 matches the SSID stored in the storage unit 22, the communication control unit 220 determines that the second wireless communication unit 27, the communication is performed with the local IP address (local address) as the destination. In other cases, the communication is performed with the access destination address as the destination using the first wireless communication unit 23 or the second wireless communication unit 27. I do.

(Operation)
Next, the operation of this embodiment will be described. The following operations are realized by executing an application program in the mobile communication terminal 20.
FIG. 4 is a flowchart showing a procedure of the control unit 21 when registering the local IP address of the home control device 40 in the mobile communication terminal 20. First, when the user performs an operation that means registering the local IP address of the in-home control device 40 using the operation unit 25, the control unit 21 accepts the operation and gives an instruction for initial registration of the local IP address. (Step S1; YES). Next, the control unit 21 determines whether or not it is in an area where communication via the wireless LAN is possible (step S2). Specifically, the control unit 21 uses at least a communication range using an interface related to a connection in a wireless LAN (for example, an interface related to a WiFi (registered trademark) connection that has undergone a predetermined authentication test in the wireless LAN standard). The second wireless communication unit 27 receives a broadcast message including the SSID from one router (also referred to as an access point). And the control part 21 selects the access point to connect based on a prior setting, or when a new SSID is received, a user selects either from the list of SSIDs displayed on the display part 26 As a result, it is determined whether communication via the wireless LAN is possible. At this time, when a restriction condition such as user restriction or encryption is set in advance, the control unit 21 performs connection setting using a well-known technique related to a wireless LAN.

At this time, the control unit 21 can acquire the SSID of the router 70 and the wireless channel of the wireless LAN using the WifiManager and WifiInfo classes defined in a computer environment called Android (registered trademark), for example. Based on the presence or absence of these acquisitions, it is possible to determine whether or not the user is in an area where communication via a wireless LAN is possible. WifiManager is a class that can specify that communication via a wireless LAN is possible, and WifiInfo is a class that can acquire the SSID of a wireless router. Specifically, the Android developers website (http://developer.android.com/reference/android/net/wifi/WifiManager.html
Refer to http://developer.android.com/reference/android/net/wifi/WifiInfo.html).

  When in an area where communication via a wireless LAN is possible (step S2; YES), the control unit 21 sends out a control packet of a predetermined format from the second wireless communication unit 27 (step S3). This control packet has a meaning as a request for requesting the local IP address of the home control device 40. The transmitted control packet reaches each communication node in the wireless LAN. The in-home control device 40 is set to transmit a response packet including its own local IP address when receiving this control packet. Therefore, when the second wireless communication unit 27 receives the response packet including the local IP address from the home control device 40 (step S4; YES), the control unit 21 stores the local IP address in the storage unit 22 (step S5). ). In step S4, when the second wireless communication unit 27 does not receive a response packet including the local IP address from the home control device 40 (step S4; NO), the control unit 21 ends the process. For example, this is the case when the power of the home control device 40 is turned off or when the mobile communication terminal 20 is connected to a wireless LAN that is not home.

  FIG. 5 is a flowchart illustrating a procedure of the control unit 21 when the mobile communication terminal 20 accesses the home control device 40 to perform communication. First, when the user performs an operation meaning that the electric device 30 is remotely operated using the operation unit 25, the control unit 21 receives the operation and determines that there is an instruction for remote operation (step S11; YES). ). Next, the control unit 21 determines whether or not it is in an area where communication via the wireless LAN is possible (step S12). At this time, the control unit 21 acquires the SSID of the router 70 by using the WifiManager and WifiInfo classes described above.

  If the mobile communication terminal 20 is outside the area of the wireless LAN when the mobile communication terminal 20 is not in an area where communication via the wireless LAN is possible (step S12; NO), the control unit 21 performs the mobile communication. In order to perform communication via the network 10, the first wireless communication unit 23 is used to access the access destination URL read from the storage unit 22 (step S15). This access destination URL is converted into a global IP address assigned to the router 70 by DNS. When the control unit 21 accesses the router 70 with the global IP address as the destination, the access is routed to the home control device 40 by the NAPT function of the router 70.

  When the control unit 21 determines that it is in an area where communication via the wireless LAN is possible (step S12; YES), the SSID acquired from the router 70 and the SSID stored in the storage unit 22 are equal. It is determined whether or not it has been done (step S13). If the two match (step S13; YES), it means that the mobile communication terminal 20 is in the house (that is, the place where the LAN to which the electric device 30 to be remotely operated belongs is provided), so that the control is performed. The unit 21 uses the second wireless communication unit 27 to perform access with the local IP address read from the storage unit 22 as the destination (step S14). This access is routed to the home control device 40 by the router 70.

  On the other hand, if the two do not match (step S13; NO), the mobile communication terminal 20 is not provided with a wireless LAN communicable area other than the home (that is, the LAN to which the electric device 30 to be remotely operated belongs is not provided. However, the control unit 21 uses the second wireless communication unit 27 to access the access destination URL read from the storage unit 22 (step S3). S15). This access destination URL is converted into a global IP address assigned to the router 70 by DNS. When the control unit 21 accesses the router 70 using the global IP address as a destination, the access is routed from the WAN side to the router 70, and is therefore routed to the home control device 40 by the NAPT function.

  As described above, when the SSID assigned to the router 70 that is the communication partner of the second wireless communication unit 27 matches the SSID stored in the storage unit 22 (step S13; YES) ), Using the second wireless communication unit to perform communication with the local ID address as the destination, otherwise (step S12; NO, step S13; NO), the first wireless communication unit 23 or the second wireless communication Using the unit 27, communication with the access destination address as the destination is performed.

  Then, in both cases of access from outside the house and access from within the house, screen data for displaying an operation screen as illustrated in FIG. 6 is transmitted from the home control device 40 to the mobile communication terminal 20. . The user selects a desired electrical device 30 on this screen, and further performs an operation for designating the operation of the electrical device 30. An instruction corresponding to this operation is transmitted from the mobile communication terminal 20 to the home control device 40 via the router 70. The in-home control device 40 wirelessly transmits data indicating the above instruction to the control adapter 50 corresponding to the electrical device 30 selected by the user. The control adapter 50 instructs the electrical device 30 to perform an operation to be performed by the electrical device 30 based on data wirelessly transmitted from the home control device 40. The electric device 30 operates according to the instruction.

  According to the above embodiment, even if the user is present or not present at the place where the LAN including the electrical device 30 to be remotely operated is installed, the user can more easily perform the electrical device. 30 can be operated remotely. More specifically, for example, compared to a method of instructing the mobile communication terminal 20 with a different communication address depending on whether or not the user is in the house, the above embodiment is less time-consuming for the user. Compared with a method of setting a new routing rule in the router 70 that routes to the home control device 40 even when a global IP address assigned to the router 70 is accessed from a communication node inside the wireless LAN, In the above-described embodiment, the setting work for such a router becomes unnecessary. Furthermore, even if compared with a method of accessing the router 70 via a proxy server device from a separately prepared global IP address, the above embodiment requires less time and effort for the user.

(Modification)
The present invention is not limited to the above-described embodiment, and the following modifications are possible. Further, the following modifications may be combined with each other.
(Modification 1)
For example, the user may go out of the house as it is while operating the mobile communication terminal 20 in the house and remotely operating the electrical device 30. On the contrary, the user may enter the home as it is while operating the mobile communication terminal 20 outside the home to remotely control the electrical device 30. In this case, in the mobile communication terminal 20, communication addressed to the local IP address using the second radio communication unit 27 and communication addressed to the access destination address using the first radio communication unit 23 or the second radio communication unit 27 are performed. It will be switched. The control unit 21 stores information related to the communication session with the in-home control device 40 before the switching in the storage unit 22, and reads out from the storage unit and uses the information after the switching, Communicate. In this way, communication is not interrupted before and after switching.

(Modification 2)
In the example of FIG. 1, the home control device 40 interposed between the router 70 and the electric device 30 controls the electric device 30, but the electric device 30 itself may operate according to an instruction from the router 70. . In this case, the router 70 and the electrical device 30 are directly connected without going through the home control device 40. In this case, the control device that controls the electrical device is a control circuit built in the electrical device.
In the example of FIG. 1, the home control device 40 and the electric device 30 communicate with each other via the control adapter 50, but the home control device 40 and the electric device 30 may directly communicate with each other.
Further, the communication between the home control device 40 and the electrical device 30 does not need to be wireless, and the communication between the home control device 40 and the router 70 does not need to be wired.

(Modification 3)
In the embodiment, the SSID stored in the storage unit 22 has been actively acquired by the mobile communication terminal 20. However, as described above, this can be performed by the user using the operation unit 25 in the mobile communication terminal 20. It may be entered. Thus, when the user inputs the SSID to the mobile communication terminal 20, there is no need to modify or add the function on the home control device 40 side so that the mobile communication terminal 20 can acquire the SSID as in the embodiment. There is an advantage.

(Modification 4)
The above embodiment has been described with reference to an example of a computer environment called Android. However, the present invention is not limited to this, and other computer environments such as iOS, Symbian, Windows (registered trademark) mobile, and other OS (Operation System) are installed. It may be any computer environment applied in a thin client environment that itself exists on the network side and provides various information to the user.
In the above embodiment, the control unit 21 acquires the SSID of the router 70 using the WifiManager and WifiInfo classes defined in Android. However, as described above, when using a computer environment other than Android, the control unit 21 has a function of acquiring the SSID of the router 70 like the WifiManager and WifiInfo classes in Android. An interface related to the connection may be used.
The programs executed in the mobile communication terminal 20 described above are magnetic tape, magnetic disk, floppy (registered trademark) disk, optical recording medium, magneto-optical recording medium, CD (Compact Disk), DVD (Digital Versatile Disk), RAM, and the like. It can be provided in a state of being recorded on the recording medium.

DESCRIPTION OF SYMBOLS 1 ... Communication system, 10 ... Mobile communication network, 20 ... Mobile communication terminal, 21 ... Control part, 22 ... Memory | storage part, 23 ... 1st radio | wireless communication part, 24 ... Voice input / output unit, 25 ... operation unit, 26 ... display unit, 27 ... second wireless communication unit, 210 ... address acquisition unit, 220 ... communication control unit, 30 ... Electrical equipment, 40 ... home control device, 50 ... control adapter, 60 ... Internet, 70 ... router

Claims (5)

A router connected to a control device for controlling electrical equipment via a LAN (Local Area Network), first wireless communication means for communicating via a WAN (Wide Area Network),
Second wireless communication means for communicating with the router;
An access destination address that is a communication address assigned to the control device in the WAN, a local address that is a communication address assigned to the control device in the LAN, and the router communicates with the second wireless communication means Storage means for storing an identifier assigned to the router for
If the identifier assigned to the router that is the communication partner of the second wireless communication means matches the identifier stored in the storage means, the local address is set using the second wireless communication means. In other cases, the first communication is performed, and otherwise, the second communication is performed using the first wireless communication unit or the second wireless communication unit as the destination, and the second communication is performed. When switching from the first communication to the second communication and when switching from the second communication to the first communication, the information related to the communication session with the control device before the switching is switched. A mobile communication terminal comprising: a communication control unit that communicates with the control device after use . The communication performed by the second wireless communication unit with the router is communication based on a wireless LAN standard,
The mobile communication terminal according to claim 1, wherein the identifier assigned to the router is an SSID (Service Set Identifier). The communication control unit acquires an SSID of the router that is a communication partner of the second wireless communication unit using an interface related to connection in a wireless LAN, and compares the SSID with the identifier stored in the storage unit The mobile communication terminal according to claim 2. Using the second wireless communication means, an address acquisition is performed for transmitting a request for the local address assigned to the control device and receiving the local address transmitted from the control device in response to the request. With means,
The mobile communication terminal according to any one of claims 1 to 3, wherein the storage unit stores a local address acquired by the address acquisition unit. A computer comprising a router connected to a control device for controlling electrical equipment via a LAN, first wireless communication means for communicating via a WAN, and second wireless communication means for communicating with the router;
An access destination address that is a communication address assigned to the control device in the WAN, a local address that is a communication address assigned to the control device in the LAN, and the router communicates with the second wireless communication means Storage means for storing an identifier assigned to the router for
If the identifier assigned to the router that is the communication partner of the second wireless communication means matches the identifier stored in the storage means, the local address is set using the second wireless communication means. In other cases, the first communication is performed, and otherwise, the second communication is performed using the first wireless communication unit or the second wireless communication unit as the destination, and the second communication is performed. When switching from the first communication to the second communication and when switching from the second communication to the first communication, the information related to the communication session with the control device before the switching is switched. A program that is used after the program to function as communication control means for communicating with the control device.

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