JP6668917B2 - Communication system, information processing device, communication terminal, communication method and program - Google Patents

Description

  The present invention relates to a communication system for performing communication between a communication terminal and an information processing device, an information processing device and a communication terminal used in the communication system, a communication method, and a program for causing a computer to execute the processing.

  In an information processing apparatus such as a communication terminal such as a smart device or a server, an operating system (OS) is implemented as software for performing basic functions and control of the device. The OS has basic functions commonly used by many pieces of software such as drivers and applications. For the OS, an API (Application Programming Interface) that defines procedures for calling and using the basic functions is disclosed and provided. Thus, the software developer can create the software only by writing a program that calls the function of the OS according to the API.

  One of the functions of the OS is to establish a wireless communication connection or disconnect the connection. Regarding the disconnection, there has been proposed a technology in which, when the connection is automatically disconnected when the radio wave environment deteriorates, the automatic disconnection determination time can be arbitrarily set according to the situation (for example, Patent Document 1). reference).

  It is customary that a maker that develops hardware of a device that performs communication using Bluetooth (registered trademark), which is one of wireless communication, also develops software and a protocol stack to be mounted on the device. Here, the protocol stack is for stacking communication protocols in a hierarchy and realizing a communication function by linking them. According to this practice, it is possible to develop and introduce a unique control packet as in the above technique.

  However, at present, representative manufacturers have developed and provided OSs such as Android (registered trademark) and iOS (registered trademark) that absorb the model-dependent differences between smart devices. It is no longer possible to freely control hardware and protocol stacks.

  For this reason, even if the API is executed from the application of the smart device, it is not possible to freely control the hardware and the protocol stack, and a disconnect request is not immediately transmitted from the smart device due to the design of the OS. . In this case, when it is desired to disconnect the communication established with the information processing device that is the communication partner, the communication cannot be disconnected and a time period during which another smart device cannot communicate with the information processing device occurs. was there.

  Therefore, it is desired to provide a system or method capable of cutting off communication with an information processing device at a timing designated by a communication terminal and reducing the time during which another communication terminal cannot communicate with the information processing device. Was.

  The present invention has been made in view of the above problems, and is a communication system for performing communication between a communication terminal and an information processing device, wherein the information processing device issues a disconnection request for disconnecting communication to the communication terminal. A request receiving unit that receives a request to transmit, an instruction unit that receives the request and instructs the communication terminal to transmit a disconnection request, and receives an instruction from the instruction unit and transmits a disconnection request to the communication terminal A communication unit that receives the response to the disconnection request from the communication terminal and disconnects communication with the communication terminal.

  According to the present invention, communication with an information processing device can be cut off at a timing designated by a communication terminal, and the time during which another communication terminal cannot communicate with the information processing device can be reduced.

FIG. 1 is a diagram illustrating a configuration example of a communication system according to an embodiment. FIG. 4 is a diagram for describing processing for disconnecting communication established by Bluetooth (registered trademark). FIG. 2 is a diagram illustrating a hardware configuration of a smart device as a communication terminal included in the communication system. FIG. 2 is a diagram illustrating a hardware configuration of an image forming apparatus as an information processing apparatus included in the communication system. FIG. 2 is a block diagram showing a functional configuration of the smart device. FIG. 2 is a block diagram illustrating a functional configuration of the image forming apparatus. FIG. 2 is a diagram illustrating a configuration of a database for a cutting process held by the image forming apparatus. The figure which showed the information written in a database. FIG. 3 is a sequence diagram showing a first embodiment of a process performed by the communication system. FIG. 7 is a sequence diagram showing a second embodiment of the processing performed by the communication system. FIG. 13 is a sequence diagram showing a third embodiment of the processing performed by the communication system. FIG. 13 is a sequence diagram showing a fourth embodiment of the processing performed by the communication system. FIG. 3 is a diagram more specifically explaining the specific use case performed by the communication system.

  FIG. 1 is a diagram illustrating a configuration example of a communication system according to the present embodiment. The communication system includes a smart device 10 as a communication terminal and an image forming apparatus 11 as an information processing device that performs wireless communication with the smart device 10. In FIG. 1, the image forming apparatus 11 is connected to a network 12 such as a LAN (Local Area Network) or the Internet, and has only one smart device 10 that performs wireless communication with the image forming apparatus 11. It is not limited. Therefore, the image forming apparatus 11 may not be connected to the network 12, and the number of the smart devices 10 may be two or more. Further, the number of the image forming apparatuses 11 may be two or more. The network 12 may be a wired network or a wireless network, and is not limited to one network, and may be a network in which two or more networks are connected by a router or the like.

  The smart device 10 is connected to the image forming apparatus 11 by wireless communication, and has an application, an OS, and an API for instructing execution of a job such as printing or scanning. As the smart device 10, a smartphone, a tablet terminal, a smart watch, a smart glass, a PDA (Personal Digital Assistant), or the like can be used. Smart watches, smart glasses, and the like are called wearable terminals because they are worn and used by users. Here, the smart device 10 has been described as an example, but the present invention is not limited to this, and may be a notebook PC or another communicable device.

  The wireless communication may be any of infrared communication, Bluetooth (registered trademark), and wireless LAN, but here, wireless communication is performed using Bluetooth (registered trademark) Low Energy (BLE) added in Bluetooth (registered trademark) 4.0. Will be described. Note that Bluetooth (registered trademark) may be a PAN (Personal Area Network) wireless medium such as so-called classic Bluetooth (registered trademark) before Bluetooth (registered trademark) 3.x.

  By the way, BLE is a standard for performing power-saving communication, and the connection of the communication is defined by a GAP (Generic Access Profile) of a Bluetooth (registered trademark) SIG (Special Interest Group) that specifies connection rules.

  The image forming apparatus 11 receives printing and scanning instructions from the smart device 10 by wireless communication, and performs printing and image reading. As the image forming apparatus 11, a printer, a scanner, a facsimile apparatus, a copier, an MFP (Multi-Function Peripheral) that implements these functions, or the like can be used. Here, an example in which the image forming apparatus 11 is used as the information processing apparatus is shown, but the present invention is not limited to this, and may be a server, a PC, a projector, an electronic blackboard, a digital camera, a 3D printer, or the like.

  The user uses the smart device 10 to start an application mounted on the smart device 10, opens an image to be printed or scanned, and instructs printing or scanning of the image. The smart device 10 establishes a connection with the image forming apparatus 11 by wireless communication, transmits image data of the image to the image forming apparatus 11, and requests printing or scanning. Upon receiving the image data and the request, the image forming apparatus 11 prints or scans the image data.

  The smart device 10 requests the image forming apparatus 11 to perform printing or scanning, and performs a process of automatically disconnecting the connection when all processes to the image forming apparatus 11 are completed. Note that the process of disconnecting the connection can also be performed by the user instructing the disconnection of the communication established between the smart device 10 and the image forming apparatus 11 after the printing or scanning is completed. In this case, the smart device 10 and the image forming apparatus 11 can execute the process of disconnecting the connection in response to the instruction.

  Here, a process of disconnecting the connection between the Bluetooth (registered trademark) compatible devices will be described with reference to FIG. FIG. 2A is a diagram showing a process when an application layer, which is an upper layer of a protocol stack implemented in one device, that is, a host A requests disconnection. FIG. 2B is a diagram illustrating a process when the host B of the protocol stack mounted on another device of the communication partner of the host A requests disconnection. In these figures, one device has a host A and a link layer (LL) A as a lower layer thereof, and the other device has a host B and a link layer B. For example, one device is the smart device 10 and the other device is the image forming apparatus 11.

  In the process shown in FIG. 2A, the host A requests the link layer A to disconnect the connection (S1), and the link layer A responds to the request (S2). The link layer A transmits an LL_TERMINATE_IND packet to the link layer B as a disconnection request (S3). The link layer B receives the disconnection request, and responds to the link layer A with an LLack packet (S4). Upon receiving this response, the connection is disconnected, and the link layer B notifies the host B that the disconnection has been completed (S5). Similarly, the link layer A also notifies the host A that the disconnection has been completed (S6).

  In the process shown in FIG. 2B, the host B requests the link layer B to disconnect the connection (S1), and the link layer B responds to the request (S2). The link layer B transmits a connection disconnection request to the link layer A (S3). The link layer A receives the disconnection request and responds to the link layer B with an LLack packet (S4). Upon receiving this response, the connection is disconnected, and the link layer A notifies the host A that the disconnection has been completed (S5). Similarly, the link layer B notifies the host B that the disconnection has been completed (S6).

  The user uses the smart device 10 to determine disconnection between the smart device 10 and the image forming apparatus 11 and instructs the disconnection. Therefore, the process of disconnecting the connection is a process as shown in FIG. However, even when an API is actually executed from an application mounted on the smart device 10, a disconnection request from a basic part (platform) such as an OS or hardware may not be transmitted to the image forming apparatus 11 at an intended timing. . This is because, as described above, the maker that develops the platform and the maker that develops software such as applications are different, and the application cannot control the hardware and the protocol stack that constitute the platform. In this embodiment, the platform means an information processing terminal that operates on iOS, ANDROID, CHROME, or another operating system (OS). More specifically, the platform of the present embodiment means a functional unit having a communication function. For example, in iOS, an API for disconnecting the connection state from the connection source to the connection destination is published, but even if the API is executed, the connection state remains for about 30 seconds, and as a result, the connection destination is another smart device I have time when I can't connect with The following table summarizes whether the timing at which an API is executed for each BLE command in iOS and the timing at which it is actually transmitted are too different and may cause problems in actual operation.

  In this case, communication with the image forming apparatus 11 cannot be cut off at the timing specified by the user and specified by the application, and a time period during which another smart device cannot communicate with the image forming apparatus 11 occurs. It will be.

  Compared to the transmission of the disconnection request, the unique communication of the application layer, for example, the transmission and reception of data, can be performed at the timing intended by the application. Therefore, this communication system is configured to transmit any data from the smart device 10 to the image forming apparatus 11 and cause the image forming apparatus 11 to transmit a disconnection request, and perform the disconnection processing illustrated in FIG. Realize. This is because the above-described problem does not occur in the image forming apparatus 11 because the platform and the manufacturer that develops the software are the same.

  This makes it possible to disconnect the communication at the timing intended by the application of the smart device 10, and to reduce the time during which other smart devices cannot use the image forming apparatus 11.

  A hardware configuration and a functional configuration of the smart device 10 and the image forming apparatus 11 for realizing this will be described with reference to FIGS. FIG. 3 is a diagram illustrating a hardware configuration of the smart device 10. The smart device 10 has the same configuration as a general communication terminal such as a smartphone. That is, the smart device 10 includes a CPU (Central Processing Unit) 20, a RAM (Random Access Memory) 21, a ROM (Read Only Memory) 22, an HDD (Hard Disk Drive) 23, an I / F 24, and a display device. 25, an input device 26, and wireless communication media 27 and 28.

  The CPU 20 is an arithmetic unit and controls the entire smart device 10. The RAM 21 is a volatile storage medium capable of reading and writing information at high speed, and is used as a work area when the CPU 20 processes information. The ROM 22 is a read-only nonvolatile storage medium, and stores a boot program, firmware, and the like for activating the smart device 10. The HDD 23 is a non-volatile storage medium capable of reading and writing information, and stores an OS, various control programs, applications, and the like.

  The I / F 24 connects the bus 29 to various types of hardware and networks, and controls various types of hardware and the like. The display device 25 is, for example, an LCD (Liquid Crystal Display), and is a visual interface for a user to check the state of the smart device 10. The input device 26 is a user interface for a user to input information to the smart device 10 using, for example, a keyboard or a mouse. Here, the display device 25 and the input device 26 are described as separate devices, but a touch panel having both functions may be employed.

  The wireless communication medium 27 is a Bluetooth (registered trademark) transceiver that can be controlled from an application, and the wireless communication medium 28 is a Wi-Fi transceiver different from the wireless communication medium 27. As the wireless communication medium 27, a wireless medium of Bluetooth (registered trademark) 4.0 can be used, but even a PAN wireless medium such as a so-called classic Bluetooth (registered trademark) before Bluetooth (registered trademark) 3.x is used. Good. As the wireless communication medium 28, a wireless medium such as Wi-Fi defined by the IEEE802.11 standard can be used.

  FIG. 4 is a diagram illustrating a hardware configuration of the image forming apparatus 11. The image forming apparatus 11 has a configuration in which the controller 30 and the engine unit 40 are connected by a PCI (Peripheral Component Interface) bus 41. The controller 30 controls the entire image forming apparatus 11, drawing, communication, and input of information from the operation unit 42. The engine unit 40 is a printer engine or the like that can be connected to the PCI bus 41, and is, for example, a monochrome plotter, a one-drum color plotter, a four-drum color plotter, a scanner, a facsimile unit, or the like. The engine unit 40 includes an image processing unit that performs error diffusion, gamma conversion, and the like, in addition to the plotters and the like.

  The controller 30 includes a CPU 31, a north bridge (NB) 32, a system memory (MEM-P) 33, a south bridge (SB) 34, and a local memory (MEM-C) 35. Further, the controller 30 includes an ASIC (Application Specific Integrated Circuit) 36 and an HDD 37, and has a configuration in which the NB 32 and the ASIC 36 are connected by an AGP (Accelerated Graphics Port) bus 38. The MEM-P 33 includes a ROM 33a and a RAM 33b.

  The CPU 31 controls the entire image forming apparatus 11, has a chip set including the NB 32, the MEM-P 33, and the SB 34, and is connected to other devices via the chip set. The NB 32 is a bridge for connecting the CPU 31, the MEM-P 33, the SB 34, and the AGP bus 38, and includes a memory controller that controls reading and writing of the MEM-P 33, a PCI master, and an AGP target. The PCI master is a device that performs data transfer, and the AGP target is a device that receives the data transfer.

  The MEM-P33 is used as a storage memory for storing programs and data, as a development memory for reading and developing the programs and data, and as a drawing memory used when performing drawing processing. Is done. The ROM 33a is a read-only memory used as a memory for storage. The RAM 33b is a memory that can perform both writing and reading, which is used as a development memory and a drawing memory.

  The SB 34 is a bridge for connecting the NB 32 to a PCI bus and peripheral devices. The SB 34 is connected to the NB 32 via a PCI bus, and a network interface (I / F) unit and the like are also connected to the PCI bus. The MEM-C 35 is used as a copy image buffer that temporarily stores image data for copying, and is used as a code buffer that temporarily stores image data when encoding.

  The ASIC 36 is an image processing IC (Integrated Circuit) and has a role as a bridge for connecting the AGP bus 38, the PCI bus 41, the HDD 37, and the MEM-C 35, respectively. The ASIC 36 includes a PCI master and an AGP target, an ARB (Arbiter) that forms the core of the ASIC 36, a memory controller that controls the MEM-C 35, and a plurality of DMACs (Direct Memory) that rotate image data using hardware logic or the like. Access Controller) and a PCI unit that performs data transfer with the engine unit 40 via the PCI bus 41.

  The ASIC 36 is connected to an FCU (Facsimile Control Unit) 43, a USB (Universal Serial Bus) 44, and an IEEE1394 (the Institute of Electrical and Electronics Engineers 1394) interface 45 via a PCI bus 41. Further, the wireless communication media 46 and 47 are connected to the ASIC 36 as in the smart device 10. The wireless communication medium 46 is a wireless medium that can be controlled from an application such as a Bluetooth (registered trademark) 4.0 transceiver, and is also a PAN wireless medium such as a so-called classic Bluetooth (registered trademark) before Bluetooth (registered trademark) 3.x. It may be. The wireless communication medium 47 is a wireless medium such as a Wi-Fi transceiver different from the wireless communication medium 46.

  The HDD 37 is a nonvolatile storage medium that stores image data, programs, font data, forms, and the like. The HDD 37 also stores a license file of an application executed by the image forming apparatus 11, and the like. Here, the HDD 37 is used, but an SSD (Solid State Drive) may be used. The AGP bus 38 is a bus interface for a graphic accelerator card proposed to speed up graphic processing, and speeds up the graphic accelerator card by directly accessing the MEM-P 33 with high throughput.

  The operation unit 42 is directly connected to the ASIC 36, and displays information input from a user, the status of job processing of the image forming apparatus 11, and the like to the user. The operation unit 42 may have a configuration including a display unit and input buttons, or may be an operation panel including a touch panel.

  FIG. 5 is a functional block diagram of the smart device 10. The smart device 10 includes a communication unit 50, a communication management unit 51, a request output unit 52, a time determination unit 53, an encoding unit 54, and a decoding unit 55. The communication unit 50 in the present embodiment provides a function corresponding to the platform defined in this specification. The request output unit 52, the time determination unit 53, the encoding unit 54, and the decoding unit 55 are realized by the CPU 20 executing an application stored in the HDD 23. Further, the communication unit 50 and the communication management unit 51 are realized by the I / F 24 and the wireless communication media 27 and 28, and a protocol stack of wireless communication provided by the platform.

  The request output unit 52 receives a command from the user and outputs a connection request for connecting to the image forming apparatus 11 by wireless communication. When receiving the connection request from the request output unit 52, the communication management unit 51 instructs the communication unit 50, and the communication unit 50 executes a connection process for the device address specified in the connection request.

  Explaining the actual BLE, an LE Create Connection command is issued from the application layer (host) in the protocol stack of the smart device 10 to the link layer. The communication management unit 51 is realized by this host, and the communication unit 50 is realized by a link layer. In response to this, the link layer transmits a CONNECTION_REQ packet as a connection request to the image forming apparatus 11 at the device address. Thereafter, the connection parameters are exchanged with the image forming apparatus 11, and when the connection is completed, the link layer of the smart device 10 notifies the host of a LE Connection Complete event.

  The request output unit 52 outputs a read request or a write request for reading / writing information to / from the image forming apparatus 11 while being connected to the image forming apparatus 11. Upon receiving a read request or a write request from the request output unit 52 via the communication management unit 51, the communication unit 50 executes the procedure specified by the request.

  Explaining this also with BLE, the application executes an API to make the request, and the protocol stack executes the procedure specified in the request. Each procedure reads and writes the GATT Characteristic value of the GATT Service based on the GATT profile. Here, the profile indicates what each device can do using Bluetooth (registered trademark), and the GATT Service is a list of functions (services) of the image forming apparatus 11. The Characteristic value is a value of data that configures the service. In BLE, communication is performed in such a manner that the smart device 10 reads and writes the above GATT Characteristic value to the image forming apparatus 11. Reading and writing of GATT Characteristic value of GATT Service can be realized by using API of each platform as sub procedure.

  In reading and writing the GATT Characteristic value, it is possible to encode the data as the value or to decode the encoded data. Although the communication standard has an encoding function, the encryption option cannot be used particularly when connecting to a device without performing pairing with BLE. Therefore, encoding or decoding can be performed in the application. The smart device 10 may include an encoding unit 54 for encoding and decoding, and a decoding unit 55 for decoding. The encoding unit 54 encodes, that is, encrypts information such as a connection request and a read / write request transmitted to the image forming apparatus 11, and the decryption unit 55 decrypts the encrypted information received from the image forming apparatus 11. . The encryption algorithm for encoding may be any algorithm.

  The request output unit 52 can output a disconnection request for disconnecting the connection when reading and writing with the image forming apparatus 11 are completed and connection is no longer required. The communication unit 50 can receive the disconnection request via the communication management unit 51 and transmit the disconnection request to the image forming apparatus 11. However, in the wireless communication using Bluetooth (registered trademark), the above problem occurs. Therefore, the following request is output and transmitted instead of the above disconnection request.

  The request output unit 52 outputs a request for transmitting a disconnection request to disconnect the connection to the smart device 10 when the connection becomes unnecessary. This request is, for example, a request to write a time (for example, a numerical value representing the number of seconds) until the connection is disconnected to a specific location of the image forming apparatus 11. It should be noted that the information to be written is not limited to the time, but may be an instruction indicating disconnection immediately beforehand determined in advance. In the BLE, a request is made to write the above-mentioned time and instruction in a predetermined GATT Characteristic of the image forming apparatus 11. The above instruction may be written in another location such as the GATT Descriptor. The GATT Characteristic is in a database called GATT Service held by the application corresponding to the GATT profile used in BLE, and its value is stored as data. The communication unit 50 transmits a write request for writing the time or the like to the image forming apparatus 11 and causes the image forming apparatus 11 to write the time or the like.

  The communication unit 50 receives the disconnection request after the time written from the image forming apparatus 11 in response to the write request has elapsed or because the disconnection request is transmitted immediately without measuring the time. The communication unit 50 returns a response to the disconnection request. In BLE, since an LL_TERMINATED_IND packet is transmitted as a disconnection request from the image forming apparatus 11, it is received, and the link layer of the protocol stack returns an LLack packet as a response. Thereafter, the link layer notifies the host of a Disconnection Complete event, and the disconnection processing is completed. Therefore, the communication unit 50 can notify the communication management unit 51 that the disconnection process has been completed.

  When the request output unit 52 outputs a write request for the time, the time determination unit 53 estimates the communication time with the image forming apparatus 11 and determines how long the time is. For example, when the number of times of communication from the smart device 10 to the image forming apparatus 11 is three and one communication is completed in about three seconds, the time determining unit 53 sets the time until the time is written and disconnected by 3 × 3 = It is predicted to be 9 seconds, and is determined to be 10 seconds with a margin of 9 seconds or 1 second. The value to be written may be any of the above 9 seconds and 10 seconds, but an arbitrary value (here, 1 second) that gives a time margin so as to be disconnected after the communication has been completed three times is added. It is desirable to set the value.

  The communication time can be estimated as the time required for the remaining reading and writing. The number of times of communication can be determined by the number of times that reading and writing are required. The time required for one communication can be determined by averaging the time taken from the communication history up to that time, and that time can be adopted. it can. Since these are examples, the time may be predicted by other methods. Further, the above-mentioned arbitrary value is not limited to the above-mentioned one second, and may be another value such as 0.5 second or two seconds.

  The request output unit 52 can generate and output a request to write the time determined by the time determination unit 53 as a write request. After the communication unit 50 transmits the write request to the image forming apparatus 11, You may want to change For example, there is a case where it is considered that the communication is to be disconnected three times later, that is, after 10 seconds, but the user wants to disconnect immediately.

  In such a case, the request output unit 52 outputs a cancel request to cancel the transmission of the disconnection request after the time specified by the writing has elapsed. The cancel request is a request to write a numerical value as cancel information in a specific location of the image forming apparatus 11 as in the case of the write request. The numerical value may be any numerical value other than the numerical value that can be measured as the designated time. This is because time cannot be measured with such a numerical value. For example, it can be a negative value such as 0 (zero) or -1. The specific location is the same location as the previously written location and can be overwritten. If the above-mentioned instruction to disconnect immediately is realized by writing 0, the cancel information can be a negative value.

  FIG. 6 is a functional block diagram of the image forming apparatus 11. The image forming apparatus 11 includes, as functional units, a communication unit 60, a communication management unit 61, a read / write processing unit 62, a storage unit 63 as the above-described database, a measurement unit 64, and an instruction unit 65. Is done. The communication unit 60 provides a function corresponding to the platform defined in this specification. A write request such as time is received from the smart device 10 and passed to the read / write processing unit 62 via the communication management unit 61.

  In FIG. 6, the communication unit 60 also has a function as a request receiving unit that receives a write request, but the request receiving unit may be configured as a separate function unit. The read / write processing unit 62 writes and stores the requested time and the above-mentioned instruction in a specific location of the storage unit 63 as information regarding the transmission of the disconnection request. Then, the read / write processing unit 62 notifies the instruction unit 65 that the writing has been completed. Hereinafter, writing will be described as time only.

  The measuring unit 64 receives the instruction from the instruction unit 65, refers to the time stored in the specific location in the storage unit 63, starts measuring time, and when the time has been reached, Notify that time has been reached. The instruction unit 65 receives the notification, generates a disconnection request for disconnecting the connection to the smart device 10, and instructs the communication management unit 61 to transmit the disconnection request. The communication management unit 61 receives the disconnection request, instructs the communication unit 60, and the communication unit 60 transmits the disconnection request to the smart device 10.

  The smart device 10 receives the disconnection request and returns a response. The communication unit 60 receives the response and executes a process of disconnecting the communication with the smart device 10. In the process of disconnecting the communication, the connection parameters exchanged at the time of connection with the smart device 10 are discarded.

  Actually, in BLE, when the protocol stack of the image forming apparatus 11 receives a CONNECT_REQ packet as a connection request from the smart device 10, the connection parameters are exchanged with the smart device 10. When the connection is completed by this exchange, the link connection layer notifies the host of the LE Connection Complete event, and notifies the application via the API. Then, upon receiving a request for reading and writing information from the smart device 10, the protocol stack responds to reading and writing of the database held by the application via the API. In BLE, GATT Characteristic values are read and written. When the reading / writing is completed, a GATT Characteristic Read / Write Response is returned, and the result is notified to the smart device 10.

  When reading or writing, data to be read or written may be encoded. The read data can be encoded and transmitted to the smart device 10, and may further include an encoding unit 66. In addition, a decoding unit 67 may be further provided to decode the encoded data transmitted from the smart device 10.

  When a disconnection request is transmitted from the smart device 10, the protocol stack returns a disconnection response to the smart device 10. Then, the protocol stack notifies the application via the API that the disconnection has been completed.

  More specifically, when the LL_TERMINATED_IND packet is transmitted from the smart device 10 and received by the protocol stack, the link layer of the protocol stack transmits the LL ack packet to the smart device 10. Then, the link layer notifies the host of the LE Disconnection Complete event. The host notifies the application via the API that the disconnection has been completed, thereby completing the disconnection process.

  The processing when the disconnection request is transmitted from the smart device 10 is as described above. However, since the disconnection request is not transmitted immediately depending on the platform, when disconnecting the connection, the smart device 10 transmits a time writing request. . The image forming apparatus 11 writes the time in a predetermined location according to the write request, and counts a timer for the written time. Then, the image forming apparatus 11 executes the disconnection processing API at the timing when the timer fires, and transmits a disconnection request to the smart device 10 from the protocol stack. Specifically, an LL_TERMINATE_IND packet is transmitted to the smart device 10 from the link layer of the protocol stack.

  When the LL ack packet is returned from the smart device 10, the link layer of the protocol stack notifies the host of an LE Disconnection Complete event. The host notifies that the disconnection has been completed via the API, thereby completing the disconnection process.

  A case will be described in which a cancel request is transmitted from the smart device 10 to the image forming apparatus 11 when the timer is already counting, and a value indicating cancellation is written in a specific location. In this case, the writing of the canceling value invalidates the disconnection processing that operates by firing the timer. Therefore, it is possible to cancel by this writing, and when setting a new time, it can be realized by writing a new value after canceling.

  The database as the storage unit 63 in which the read / write processing unit 62 writes will be described with reference to FIG. In BLE, GATT Service can define characteristics and behavior in a form that includes multiple GATT Characteristic. Here, GATT Service is defined as an original disconnection service. Each of the plurality of Characteristic has an ID as its value. Actually, GATT Characteristic has a property indicating a value or behavior, a permission indicating authority, and the like. However, in FIG. 7, it is shown as one logical unit.

  When the smart device 10 issues a disconnection request to the image forming apparatus 11, an application of the smart device 10 is required to write an appropriate value in the database. Therefore, as shown in FIG. 7, the ID and the timer time that can be divided into a plurality of GATT Characteristic are defined as one GATT Characteristic. This is because if the GATT Characteristic is divided into a plurality of parts, the writing process occurs a plurality of times, which takes a long communication time and lowers the communication speed. Note that when both the communication speed and the communication time do not matter, the ID and the timer time may be separately defined as a plurality of GATT Characteristic.

  Note that the ID is determined as a unique value without collision calculated by the hash function of the smart device 10 when the smart device 10 requests the disconnection process. This value is used to determine which cutting process to cancel when canceling the cutting process. The timer time is a time that is written when the smart device 10 requests a disconnection process, and is a time until the disconnection process is started.

  Specific values to be written will be described with reference to FIG. In FIG. 8, the ID is identification information for identifying the timer. In FIG. 8A, a value of 1 is written in association with the ID of 0x0024 so that the timer is disconnected after 1 second by the timer with the ID of 0x0024. In FIG. 8B, a value of 10 is written in association with the ID of 0x0051 so that the timer with the ID of 0x0051 disconnects after 10 seconds.

  In FIG. 8C, a value of 0 is written again to cancel the disconnection request for the timer having the same ID of 0x0051. A value of 0 is a value that disables the time measurement by the timer. When a value of 0 is immediately written as information for transmitting a disconnection request, a negative value can be used as a value for invalidating the time measurement by the timer.

  With reference to the sequence diagram shown in FIG. 9, a process of disconnecting the connection between the smart device 10 and the image forming apparatus 11 performed by the communication system will be described based on the BLE command specification. The smart device 10 includes a communication unit 50, a communication management unit 51, and a request output unit 52, and the image forming apparatus 11 includes a communication unit 60, a communication management unit 61, a read / write processing unit 62, a measurement unit 64, and an instruction unit 65. It will be described as an example.

  The request output unit 52 receives, for example, a disconnection instruction from the user, generates a write request for the time determined by the time determination unit 53 (not shown), and outputs the write request to the communication management unit 51 (S1). The communication management unit 51 outputs the write request to the communication unit 50 as a GATT Characteristic Write Request command (S2). The communication unit 50 converts the packet into an Attribute Write Request packet and transmits the packet to the image forming apparatus 11 (S3). If the maximum transmission unit (MTU), which is the maximum amount of data that can be transferred at one time, is set to a small value by the connection parameter, the packet is divided and transmitted. In this case, the receiving side combines the divided packets and reconstructs them.

  In the image forming apparatus 11, the communication unit 60 receives the Attribute Write Request packet, converts the Attribute Write Request packet into an abstracted GATT Characteristic Write Request command, and outputs the command to the communication management unit 61 (S4). The communication management unit 51 outputs the command as a write request to the read / write processing unit 62 (S5). The read / write processing unit 62 writes and sets the time requested by the write request in a specific location of the storage unit 63 (S6). Then, the read / write processing unit 62 notifies the instruction unit 65 that the writing of the time has been completed (S7). The instructing unit 65 instructs the measuring unit 64 to start measuring time (S8), and the measuring unit 64 starts measuring time in response to the instruction (S9).

  The read / write processing unit 62 also notifies the communication management unit 61 that the writing has been completed (S10). The communication management unit 61 returns to the communication unit 60 that the writing has been completed as a GATT Characteristic Write Response event (S11). The communication unit 60 converts the GATT Characteristic Write Response event into an Attribute Write Response packet and responds to the smart device 10 (S12).

  The communication unit 50 receives the Attribute Write Response packet from the image forming apparatus 11, converts it into a GATT Characteristic Write Response event, and returns it to the communication management unit 51 (S13). The communication management unit 51 returns a GATT Characteristic Write Response event to the request output unit 52 as a write result (S14). The request output unit 52 can notify the user of the result by, for example, displaying the writing result on a display unit.

  When the time written in the storage unit 63 has been reached, the measuring unit 64 notifies the instruction unit 65 that the time has been reached (S15). The instruction unit 65 generates a request to disconnect the connection with the smart device 10, and outputs the disconnection request to the communication management unit 61 to instruct disconnection (S16). The communication management unit 61 outputs a disconnection request to the communication unit 60 as a LE_Disconnect command (S17). The communication unit 60 converts the LE_Disconnect command into an LL_TERMINATE_IND packet and transmits the packet to the smart device 10 (S18).

  Upon receiving the LL_TERMINATE_IND packet, the communication unit 50 of the smart device 10 returns an LLack packet as a response (S19). Upon receiving the LL ack packet, the communication unit 60 of the image forming apparatus 11 converts the LL ack packet into an LE_Disconnection Complete event and outputs the event to the communication management unit 61 (S20). The communication management unit 61 responds to the instruction unit 65 with a notification of the completion of disconnection of the LE_Disconnection Complete event (S21).

  Further, the communication unit 50 of the smart device 10 converts the received LL_TERMINATE_IND packet into a LE_Disconnection Complete event, and outputs it to the communication management unit 51 (S22). The communication management unit 51 outputs the LE_Disconnection Complete event to the request output unit 52 as a notification that the disconnection has been completed (S23).

  The processing shown in FIG. 9 is processing when the writing time is short, but when the writing time is long, the processing is as shown in FIG. The writing time is, for example, 10 seconds. The basic processing flow is the same as the processing shown in FIG. 9, but since there is time before the disconnection request is issued, another read / write processing is inserted. Another read / write process is performed after receiving the write result in S14.

  Specifically, the request output unit 52 outputs another read / write request (S15). The communication management unit 51 outputs the read / write request to the communication unit 50 as a GATT Characteristic Read / Write Request command (S16). The communication unit 50 converts the packet into an Attribute Read / Write Request packet and transmits the packet to the image forming apparatus 11 (S17).

  In the image forming apparatus 11, the communication unit 60 receives the Attribute Read / Write Request packet, converts the Attribute Read / Write Request packet into an abstracted GATT Characteristic Read / Write Request command, and outputs the command to the communication management unit 61 (S18). The communication management unit 61 outputs the command as a read / write request to the read / write processing unit 62 (S19). The read / write processing unit 62 performs the processing requested by the read / write request on the storage unit 63 (S20). Then, the read / write processing unit 62 notifies the communication management unit 61 that the reading / writing is completed (S21). The communication management unit 61 returns to the communication unit 60 that the read / write has been completed as a GATT Characteristic Read / Write Response event (S22). The communication unit 60 converts the GATT Characteristic Read / Write Response event into an Attribute Read / Write Response packet and responds to the smart device 10 (S23).

  The communication unit 50 receives the Attribute Read / Write Response packet from the image forming apparatus 11, converts it into a GATT Characteristic Read / Write Response event, and returns it to the communication management unit 51 (S24). The communication management unit 51 returns a GATT Characteristic Read / Write Response event to the request output unit 52 as a read / write result (S25). The request output unit 52 can notify the user of the writing result by displaying the writing result on the display device 25 or the like.

  In the embodiment illustrated in FIG. 10, after the time at which the measurement of the time by the measuring unit 64 is written is reached, the same processing as the processing after S15 illustrated in FIG. 9 is performed. As described above, when the writing time is made variable and the reading and writing processing of the information of the image forming apparatus 11 can be performed from the smart device 10 while the time is measured, the time corresponding to the number of communications from the smart device 10 is set. can do. In addition, it is possible to control the time until the disconnection process when communication from the smart device 10 becomes impossible due to some trouble.

  With reference to FIG. 11, a process of writing time from the smart device 10, canceling once, and writing time again will be described. Cancellation can be realized by overwriting an invalid value in a predetermined location of the storage unit 63 in which the time is written before the time is reached. In this way, by referring to the GATT Characteristic value in the image forming apparatus 11 and adopting a configuration in which the cutting process is not executed unless the value is the predetermined value, the cutting process can be canceled and the predetermined value is written again. Thus, the disconnection process can be executed. For example, if an error occurs on the smart device 10 side after requesting that the disconnection process be executed after 10 seconds, and the user wants to immediately execute the disconnection process, canceling the request once and then requesting it again will result in the first request. Can be cut off without waiting.

  Only the parts different from the processing shown in FIG. 9 will be described. The processing up to the reception of the write result in S14 is the same as the processing shown in FIG. In FIG. 11, an error occurs in the smart device 10 (S15). The request output unit 52 generates a request to write an invalid value as cancel information in order to cancel the request for executing the disconnection processing after the writing time, and outputs the request to the communication management unit 51 (S16). The communication management unit 51 outputs the write request to the communication unit 50 as a GATT Characteristic Write Request command (S17). The communication unit 50 converts the packet into an Attribute Write Request packet and transmits the Attribute Write Request packet to the image forming apparatus 11 (S18).

  In the image forming apparatus 11, the communication unit 60 receives the Attribute Write Request packet, converts the Attribute Write Request packet into an abstract GATT Characteristic Write Request command, and outputs the command to the communication management unit 61 (S19). The communication management unit 51 outputs the command to the read / write processing unit 62 as a write request (S20). The read / write processing unit 62 overwrites the time requested by the write request at a specific location in the storage unit 63 (S21). Then, the read / write processing unit 62 notifies the instruction unit 65 that the writing has been completed (S22).

  The measuring unit 64 notifies the instruction unit 65 that the time has reached when the written time has reached (S23). The instruction unit 65 receives the notification, but does not generate a disconnection request and does not instruct the transmission of the disconnection request because the time value stored in the storage unit 63 is an invalid value. That is, the instruction unit 65 does not instruct the disconnection.

  The request output unit 52 generates a time write request to request the disconnection again, and outputs it to the communication management unit 51 (S24). The communication management unit 51 outputs the write request to the communication unit 50 as a GATT Characteristic Write Request command (S25). The communication unit 50 converts the packet into an Attribute Write Request packet and transmits the packet to the image forming apparatus 11 (S26).

  In the image forming apparatus 11, the communication unit 60 receives the Attribute Write Request packet, converts the Attribute Write Request packet into an abstract GATT Characteristic Write Request command, and outputs the command to the communication management unit 61 (S27). The communication management unit 51 outputs the command to the read / write processing unit 62 as a write request (S28). The read / write processing unit 62 overwrites the time requested by the write request to a specific location in the storage unit 63 (S29). Then, the read / write processing unit 62 notifies the instruction unit 65 that the writing has been completed (S30).

  The instruction unit 65 instructs the measurement unit 64 to start measuring time (S31). Upon receiving the notification, the measuring unit 64 starts measuring time (S32).

  When the time reaches the written time, the measuring unit 64 notifies the instruction unit 65 that the time has reached (S33). The instruction unit 65 checks the value stored in the storage unit 63, generates a request to disconnect the connection with the smart device 10, outputs the disconnection request to the communication management unit 61, and instructs disconnection (S34). . The communication management unit 61 outputs a disconnection request to the communication unit 60 as a LE_Disconnect command (S35). The communication unit 60 converts the LE_Disconnect command into an LL_TERMINATE_IND packet and transmits the packet to the smart device 10 (S36).

  Upon receiving the LL_TERMINATE_IND packet, the communication unit 50 of the smart device 10 returns an LLack packet as a response (S37). Upon receiving the LL ack packet, the communication unit 60 of the image forming apparatus 11 converts the LL ack packet into an LE_Disconnection Complete event and outputs the event to the communication management unit 61 (S38). The communication management unit 61 responds to the instruction unit 65 as a notification that the disconnection has been completed with the LE_Disconnection Complete event (S39).

  Further, the communication unit 50 of the smart device 10 converts the received LL_TERMINATE_IND packet into an LE_Disconnection Complete event, and outputs it to the communication management unit 51 (S40). The communication management unit 51 outputs the LE_Disconnection Complete event to the request output unit 52 as a notification that disconnection has been completed (S41).

  The processing of disconnecting the connection between the smart device 10 and the image forming apparatus 11 can be performed by sending a write request from the smart device 10 according to an instruction from the user, but is automatically performed without the instruction. Is also possible. Specifically, by setting so as to disconnect the connection after a predetermined time from the completion of the connection, the measuring unit 64 measures the time and automatically executes the disconnection process when the time is reached. be able to. Accordingly, when the user wirelessly connects to the image forming apparatus 11 for a long time by mistake and occupies the wireless connection with the image forming apparatus 11 without noticing, the user can be automatically disconnected. Further, the time during which another smart device cannot connect to the image forming apparatus 11 can be reduced.

  With reference to FIG. 12, a case where the disconnection processing is automatically performed will be described. The request output unit 52 receives a connection instruction from, for example, a user, generates a connection request for the image forming apparatus 11, and outputs the request to the communication management unit 51 (S1). The communication management unit 51 outputs the connection request to the communication unit 50 as a LE Create Connection command (S2). The communication unit 50 converts the packet into a CONNECT_REQ packet and transmits the CONNECT_REQ packet to the image forming apparatus 11 (S3).

  In the image forming apparatus 11, the communication unit 60 receives the CONNECT_REQ packet, exchanges connection parameters with the communication unit 50 of the smart device 10, and establishes a connection. The communication unit 60 outputs to the communication management unit 61 that the communication has been established as a LE Connection Complete command (S4). The communication management unit 51 notifies the instruction unit 65 of the command as a connection completion notification (S5). The instructing unit 65 instructs the measuring unit 64 to start time measurement (S6). Upon receiving the instruction, the measuring section 64 starts measuring the time previously written in a predetermined location of the storage section 63 (S7).

  After the connection has been established, the communication unit 50 of the smart device 10 outputs to the communication management unit 51 that the connection has been established to the communication management unit 51 as a LE Connection Complete command (S8). The communication management unit 51 notifies the request output unit 52 of the command as a connection completion notification (S9). The request output unit 52 can notify the user of the result by, for example, displaying on the display device 25 that the connection has been completed.

  The measuring unit 64 notifies the instructing unit 65 that the time has been reached when the time reaches the previously written time (S10). In this example, since the written value has not been changed, the instruction unit 65 generates a request to disconnect the connection with the smart device 10, and outputs the disconnection request to the communication management unit 61 to instruct disconnection. (S11). The communication management unit 61 outputs a disconnection request to the communication unit 60 as a LE_Disconnect command (S12). The communication unit 60 converts the LE_Disconnect command into an LL_TERMINATE_IND packet and transmits the packet to the smart device 10 (S13).

  Upon receiving the LL_TERMINATE_IND packet, the communication unit 50 of the smart device 10 returns an LLack packet as a response (S14). Upon receiving the LL ack packet, the communication unit 60 of the image forming apparatus 11 converts the LL ack packet into an LE_Disconnection Complete event and outputs the event to the communication management unit 61 (S15). The communication management unit 61 responds to the instruction unit 65 with a notification of the completion of disconnection of the LE_Disconnection Complete event (S16).

  Further, the communication unit 50 of the smart device 10 converts the received LL_TERMINATE_IND packet into an LE_Disconnection Complete event, and outputs it to the communication management unit 51 (S17). The communication management unit 51 outputs the LE_Disconnection Complete event to the request output unit 52 as a notification that the disconnection has been completed (S18).

  Although the processes performed by the communication system, the communication terminal, and the information processing device based on the BLE specifications have been described in detail, the present invention is not limited to wireless communication based on BLE. Therefore, the present invention can be applied to other wireless communication. In the above example, the value is overwritten in a specific location of the storage unit 63. However, the value may be stored in another location. In this case, the latest written value may be used. Can be.

  The application will be described more specifically in the context of a specific use case. FIG. 13 is a diagram illustrating a flow of acquiring print settings for printing from the smart device 10 to the image forming apparatus 11 and information for wireless connection by wireless communication prior to printing. When the request processing unit 52 of the smart device 10 makes a connection request using the API provided by the platform (S1), a LE Create Connection command is transmitted from the communication management unit 51 of the smart device 10 to the communication unit 50 ( S2).

  In response to this, a CONNECT_REQ command, which is a connection request, is sent from the communication unit 50 of the smart device 10 to the communication unit 60 of the image forming apparatus 11 (S3). After exchanging parameters related to the connection between the smart device 10 and the image forming apparatus 11, when the connection is completed, the communication unit 50 of the smart device 10 and the communication unit 60 of the image forming apparatus 11 In response, a LE Connection Complete command is sent (S4). Further, the communication management unit 51 of the smart device 10 receives LE Connection Complete () via the API (S4), and the connection is completed (S5).

  On the other hand, when the communication unit 60 of the image forming apparatus 11 receives the connection request, the communication unit 60 issues a connection start request LE Create Connection () to the communication management unit 61 (S6). The connection completion is notified (S7). Through these series of processes, the connection from the smart device 10 to the image forming apparatus 11 is completed. After that, the connection from the smart device 10 to the image forming apparatus 11 is completed. To exchange information necessary for the operation.

  Specifically, the smart device notifies the image forming apparatus 11 of the IP address as communication information. Conversely, the IP address may be notified from the image forming apparatus 11 to the smart device. The notification of the IP address does not need to be performed in both directions, but only in one direction from the image forming apparatus 11 to the smart device and from the smart device to the image forming apparatus 11.

  The communication information to be notified is not limited to the IP address, and is not particularly limited as long as it is communication information for performing a wireless connection between the smart device and the image forming apparatus, for example, a MAC address, an SSID, or the like. Absent. In the present embodiment, the wireless connection means wireless communication using a communication platform different from BLE, and uses wireless communication of the ieee.802.x standard, LTE, Wi-fi, 3G, and any communication protocol. It can be anything.

  Thereafter, the request output unit 52 of the smart device 10 issues a write request for a set time to the communication management unit 51 in order to immediately connect an unnecessary connection (S8). When the notification of the IP address is completed, time writing is performed in the present embodiment in order to immediately disconnect the connection from the request processing unit 52 of the smart device 10. In this figure, one second can be set because it is desired to cut immediately. It is expected that one second after the completion of writing, the timer of the image-related apparatus is fired and a disconnection request is sent from the image forming apparatus side.

  When the disconnection is completed, the smart device and the image forming apparatus perform wireless connection using the above-described communication information to perform printing, communicate print settings and print data, and perform printing from the smart device. Upon receiving the time writing request, the communication management unit 51 sets the time in the GATT Characteristic value, issues GATT Characteristic Write () to the communication unit 50 (S9), and sends the GATT Characteristic Write () to the image forming apparatus 11. An Attribute Write Request () is issued to the communication unit 60 of the image forming apparatus 11 (S10).

  The communication unit 60 of the image forming apparatus 11 passes the Attribute Write Request () received to the communication management unit 61 to the communication management unit 61 (S11), and instructs the read / write processing unit 62 to write a GATT Characteristic value. (S12). Using the received GATT Characteristic value, the read / write processing unit 62 instructs the timer 62a to start timer counting (S13), and the timer 62a immediately starts timer counting (S14).

  On the other hand, when issuing the start of timer counting, the read / write processing unit 62 issues an LE_GATT Characteristic Response () notifying the completion of the writing of the GATT Characteristic value to the communication management unit 61 (S15). 61 issues an Attribute Write Response () to the communication unit 60 (S16). The communication unit 60 of the image forming apparatus 11 notifies the communication unit 50 of the smart device 10 of the Attribute Write Response (S17).

  The communication unit 50 that has received the notification notifies the communication management unit 51 of the GATT Characteristic Response (S18), and the communication management unit 51 notifies the request output unit 52 that the writing has been completed (S18). S19).

  When the timer 62a expires, the timer is activated (S20), the read / write processing unit 62 issues a processing request to disconnect the connection to the communication management unit 61 (S21), and the communication management unit 61 On the other hand, in order to end the communication state of the smart device 10, LE Disconnect () is issued (S22), and the communication unit 60 sends LL_terminate_IND to the communication unit 50 of the smart device 10 (S23). Upon receiving the notification, the communication unit 50 of the smart device 10 issues LL_ack to the communication unit 60 of the image forming apparatus 11 (S24). The communication unit 60 of the image forming apparatus 11 receives the notification and notifies the communication management unit 61 of LE Disconnection Complete for notifying that the disconnection has been completed (S25).

  The communication management unit 61 issues a disconnection completion notification to the read / write processing unit 62 (S26), and ends the disconnection processing on the image forming apparatus 11 side.

  When LL_ack is issued, the communication unit 50 of the smart device 10 issues LE Disconnection Complete to notify the communication management unit 51 of disconnection completion (S27). Upon receiving the notification, the communication management unit 51 of the smart device 10 notifies the request type direct unit 52 of the completion of disconnection, and terminates the processing on the smart device 10 side (S28). Thereafter, the smart device 10 and the image forming apparatus 11 perform a wireless connection using a wireless LAN or the like, so that printing can be started.

  Although the present invention has been described above with the embodiments described above as a communication system, an information processing device, a communication terminal, a communication disconnection method, and a program, the present invention is not limited to the above-described embodiments. The present invention can be modified within the range that can be conceived by those skilled in the art, such as other embodiments, additions, changes, and deletions. It is within the scope of the invention. Therefore, the present invention can provide a recording medium on which the above-described program is recorded, an external device for providing the program via a network, and the like.

DESCRIPTION OF SYMBOLS 10 ... Smart device, 11 ... Image forming apparatus, 12 ... Network, 20 ... CPU, 21 ... RAM, 22 ... ROM, 23 ... HDD, 24 ... I / F, 25 ... Display device, 26 ... Input device, 27, 28 ... Wireless communication media, 29 ... Bus, 30 ... Controller, 31 ... CPU, 32 ... NB, 33 ... MEM-P, 33a ... ROM, 33b ... RAM, 34 ... SB, 35 ... MEM-C, 36 ... ASIC, 37 ... HDD, 38 ... AGP bus, 40 ... Engine unit, 41 ... PCI bus, 42 ... Operation unit, 43 ... FCU, 44 ... USB, 45 ... IEEE1394 interface, 46, 47 ... Wireless communication media, 50 ... Communication unit, 51 ... Communication management unit, 52 ... Request output unit, 53 ... Time determination unit, 54 ... Encoding unit, 55 ... Decoding unit, 60 ... Communication unit, 61 ... Communication management unit, 62 ... Read / write processing unit, 63 ... Storage unit , 64: measuring unit, 65: instruction unit, 66: encoding unit, 67: decoding

JP 2003-61159 A

Claims (14)

A communication system for performing wireless communication using Bluetooth (registered trademark) between a communication terminal and an information processing device,
The information processing device,
A request receiving unit that receives from the communication terminal a transmission request that requests the information processing device to transmit a disconnection request that requests disconnection of the wireless communication,
An instruction unit that receives the transmission request, and instructs the communication terminal to transmit the disconnection request;
A communication unit that receives the instruction from the instruction unit and transmits the disconnection request to the communication terminal,
The communication unit receives a response to the disconnection request from the communication terminal, disconnects the communication with the communication terminal,
The disconnection request is an LL_TERMINATE_IND packet,
The communication system , wherein the transmission request is a packet of a different type from an LL_TERMINATE_IND packet . The transmission request is a write request for causing the information processing device to execute a process of writing information regarding transmission of the disconnection request to the storage unit of the information processing device,
The communication system according to claim 1, wherein the information processing device further includes a read / write processing unit that performs a process of writing information regarding transmission of the disconnection request. Includes a measuring unit that measures time,
The information on the transmission of the disconnection request is a time measured until the disconnection request is transmitted,
The instruction unit is configured to start measuring time with respect to the measurement unit in response to the end of the process of writing the time measured by the read / write processing unit before transmitting the disconnection request to the storage unit. 3. The communication system according to claim 2, wherein when the time measured by the measurement unit reaches the time written in the storage unit, the disconnection request is transmitted. 4.   The read / write processing unit, while measuring the time by the measurement unit, reads information from or from the communication terminal to the storage unit, or receives a request for execution of both, read processing of the information, 4. The communication system according to claim 3, wherein the communication system executes a write process or both processes. The read / write processing unit writes information indicating cancellation of a disconnection process from the communication terminal to the storage unit,
5. The instruction unit according to claim 2, wherein the instruction unit does not instruct the communication unit to transmit the disconnection request in response to the information indicating that the disconnection process is canceled being written in the storage unit. The communication system according to claim 1.   The communication system according to claim 4, further comprising: a coding unit that codes information to be transmitted to the communication terminal; and a decoding unit that decodes coded information received from the communication terminal. The communication system according to claim 1 , wherein the different types of packets are Attribute Write Request packets. The information processing device is an image forming device,
The request receiving unit,
The communication request for performing communication different from the wireless communication with the communication terminal with the communication terminal, the image forming apparatus receives the transmission request from the communication terminal after receiving from the communication terminal, any one of claims 1 to 7 . 2. The communication system according to claim 1. An information processing apparatus used in a communication system that performs wireless communication using Bluetooth (registered trademark) between a communication terminal and the information processing apparatus,
A request receiving unit that receives from the communication terminal a transmission request that requests the information processing device to transmit a disconnection request that requests disconnection of the wireless communication,
An instruction unit that receives the transmission request, and instructs the communication terminal to transmit a disconnection request to disconnect the wireless communication,
A communication unit that receives the instruction from the instruction unit and transmits the disconnection request to the communication terminal,
The communication unit receives a response to the disconnection request from the communication terminal, disconnects the communication with the communication terminal,
The disconnection request is an LL_TERMINATE_IND packet,
The information processing device , wherein the transmission request is a packet of a different type from the LL_TERMINATE_IND packet . A communication system for performing wireless communication using Bluetooth (registered trademark) between a communication terminal and an information processing device,
The communication terminal,
A request output unit that outputs a write request for causing the information processing device to execute a process of writing information related to transmission of a disconnection request to disconnect the wireless communication to a storage unit included in the information processing device,
A communication unit that transmits the write request output by the request output unit to the information processing device,
The information processing device,
A request receiving unit that receives the write request;
A read / write processing unit that performs a process of writing information about transmission of the disconnection request to the storage unit;
A measuring unit that starts measuring time in response to the end of the process of writing the time measured until the read / write processing unit transmits the disconnection request as information on the transmission of the disconnection request to the storage unit;
When the time measured by the measurement unit reaches the time written in the storage unit, an instruction unit that instructs the communication terminal to transmit a disconnection request to disconnect the wireless communication,
A communication unit that receives the instruction from the instruction unit and transmits the disconnection request to the communication terminal,
The communication unit of the communication terminal receives the disconnection request from the information processing device, transmits a response to the disconnection request,
The communication unit of the information processing apparatus receives the response from the communication terminal, disconnects the communication with the communication terminal,
The disconnection request is an LL_TERMINATE_IND packet,
The communication system , wherein the write request is a packet of a different type from an LL_TERMINATE_IND packet . The communication terminal used in a communication system that performs wireless communication using Bluetooth (registered trademark) between the communication terminal and the information processing device,
Including a communication unit that transmits to the information processing device a transmission request that requests the information processing device to transmit a disconnection request that requests disconnection of the wireless communication ,
The communication unit receives a disconnection request to disconnect the wireless communication from the information processing device, transmits a response to the disconnection request, disconnects the wireless communication ,
The disconnection request is an LL_TERMINATE_IND packet,
The communication terminal , wherein the transmission request is a packet of a different type from an LL_TERMINATE_IND packet . In a communication system for performing wireless communication using Bluetooth (registered trademark) between a communication terminal and an information processing device, a communication method executed by the information processing device,
Receiving a request to transmit a disconnection request to disconnect the wireless communication from the communication terminal,
Receiving the request, instructing the communication terminal to transmit a disconnection request to disconnect the wireless communication,
Receiving the transmission instruction of the disconnection request, transmitting the disconnection request to the communication terminal,
Receiving a response to the disconnection request from the communication terminal, it viewed including the step of disconnecting the communication with the communication terminal,
The disconnection request is an LL_TERMINATE_IND packet,
The communication method , wherein the request to be transmitted is a packet of a different type from an LL_TERMINATE_IND packet . A communication method for disconnecting wireless communication using Bluetooth (registered trademark) performed between a communication terminal and an information processing device,
The communication terminal,
Outputting a write request for causing the information processing device to execute a process of writing information related to transmission of the disconnection request for disconnecting the wireless communication into a storage unit included in the information processing device;
Transmitting the output write request to the information processing apparatus,
The information processing device,
Receiving the write request;
Performing a process of writing information about transmission of the disconnection request to the storage unit;
A step of starting time measurement in response to the end of the process of writing the time measured before transmitting the disconnection request as information regarding the transmission of the disconnection request in the storage unit,
When the measured time reaches the time written in the storage unit, instructing the communication terminal to transmit a disconnection request to disconnect the wireless communication,
Receiving the transmission instruction of the disconnection request, transmitting the disconnection request to the communication terminal,
The communication terminal executes the step of receiving the disconnection request from the information processing device and transmitting a response to the disconnection request,
The information processing apparatus receives the response from the communication terminal, and performing the step of disconnecting the communication with the communication terminal,
The disconnection request is an LL_TERMINATE_IND packet,
The communication method , wherein the write request is a packet of a different type from an LL_TERMINATE_IND packet . Program for executing the steps on a computer included in the communication method according to claim 12 or 13.