In a case where an image forming apparatus operates as a master station that determines a communication channel to be used in wireless communication, the image forming apparatus transmits a second trigger frame, which is compliant with the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard and includes information indicating that carrier sense is to be executed, to a slave station apparatus connected to the master station.

A management device for an image processing apparatus includes a communication interface and a hardware processor. The communication interface transmits and receives a job to be executed in the image processing apparatus. Before transmission and reception of a job, the hardware processor transmits data on a communication path of the job for measuring a communication speed to obtain information representing a communication speed of a communication path for the job transmitted and received by the communication interface, and sets a timeout time of an image processing apparatus that executes the job, based on the obtained information representing a communication speed.

In a case where an image forming apparatus operates as a master station determining a communication channel used in wireless communication, the image forming apparatus transmits a second trigger frame that includes information indicating inexecution of carrier sensing and complies with an Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, to a slave station apparatus connected to the master station.

A communication system comprising an information processing apparatus and a mobile terminal, wherein when the mobile terminal receives a packet transmitted from the information processing apparatus, it determines whether or not a login condition for transmitting a login request is satisfied based on a received signal strength of the packet, and it transmits the login request to the information processing apparatus in a case where it determines that the login condition is satisfied, and does not transmit the login request to the information processing apparatus in a case where it is determines that the login condition is not satisfied.

A communication system comprising an information processing apparatus and a mobile terminal, wherein when the mobile terminal receives a packet transmitted from the information processing apparatus, it determines whether or not a login condition for transmitting a login request is satisfied based on a received signal strength of the packet, and it transmits the login request to the information processing apparatus in a case where it determines that the login condition is satisfied, and does not transmit the login request to the information processing apparatus in a case where it is determines that the login condition is not satisfied.

A transmitting and receiving system includes a first information processing apparatus and a second information processing apparatus. The first information processing apparatus includes a first cache memory, and the second information processing apparatus includes a second cache memory. The second information processing apparatus is configured to transmit and receive information to and from the first information processing apparatus. When transmission information to be transmitted from the first information processing apparatus to the second information processing apparatus is stored in the first cache memory of the first information processing apparatus, the first information processing apparatus transmits partial information that is included in the stored transmission information to the second information processing apparatus or transmits identification information that identifies the transmission information to the second information processing apparatus.

The image processing apparatus performs a communication process targeting an external apparatus via a network. When performing a communication process, the image processing apparatus determines whether or not the external apparatus which is a target of the communication process is registered in a destination list in which apparatuses corresponding to a predetermined condition are registered. In accordance with the timeout period determined based on the determination result, the image processing apparatus determines that a timeout has occurred in the communication process. The image processing apparatus updates the destination list according to the determination result of the occurrence of the timeout and the determination result as to whether or not the external apparatus is registered in the destination list. Thereby, it is possible to provide an image processing apparatus capable of quickly executing communication process because the transmission/reception buffer is less likely to run out.

A management device for an image processing apparatus includes a communication interface and a hardware processor. The communication interface transmits and receives a job to be executed in the image processing apparatus. Before transmission and reception of a job, the hardware processor transmits data on a communication path of the job for measuring a communication speed to obtain information representing a communication speed of a communication path for the job transmitted and received by the communication interface, and sets a timeout time of an image processing apparatus that executes the job, based on the obtained information representing a communication speed.

A wireless communication unit forms any one of a first wireless network and a second wireless network, and performs wireless communication with a terminal device. An NFC communication unit performs short distance wireless communication with a terminal device. A controller switches a network of the wireless communication, which is formed by the wireless communication unit, from the first wireless network to the second wireless network, in response to the short distance wireless communication with the terminal device in a case in which the wireless communication unit forms the first wireless network.

A control server is configured to: receive, through a communication interface, a guidance image data request and specific information which are transmitted from an image processing apparatus, the guidance image data request being a request for guidance image data representing a guidance image of an acquiring procedure for acquiring authentication information required for receiving service provided by a service providing server connected to the image processing apparatus through the network; determining location information representing a location of data to be accessed in the acquiring procedure, based on the specific information transmitted from the image processing apparatus; generating the guidance image data representing the guidance image including the location information determined by the location information determining processing, when the guidance image data request is received from the image processing apparatus; and transmitting the guidance image data to the image processing apparatus through the communication interface.