Server device and communication system connected to the internet
First Claim
1. A server connected to the Internet which transfers communications between at least one device connected to the Internet and at least one terminal connectable to the Internet, wherein the server receives a periodic notice packet from the device, transmits a connection request packet to the device in reply to the notice packet if transfer to the device is requested from the terminal, accepts a TCP connection request transmitted from the device to the server in reply to the connection request packet, and transfers communications between the terminal and the device on the TCP connection after the TCP connection is established.
2 Assignments
0 Petitions
Accused Products
Abstract
A communication system includes a device and a server connected to the Internet, which transfers communications between the device and a terminal connectable to the Internet via the server. The device periodically transmits a notice packet to the server. The server transmits a connection request packet to the device in reply to the notice packet when a transfer to the device is requested from the terminal. The device transmits a TCP connection request to the server when receiving the connection request packet from the server. The server accepts the TCP connection request transmitted from the device to the server in reply to the connection request packet, to establish the TCP connection. Thus, the server transfers communications between the terminal and the device on the TCP connection after the TCP connection is established.
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Citations
31 Claims
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1. A server connected to the Internet which transfers communications between at least one device connected to the Internet and at least one terminal connectable to the Internet, wherein the server
receives a periodic notice packet from the device, transmits a connection request packet to the device in reply to the notice packet if transfer to the device is requested from the terminal, accepts a TCP connection request transmitted from the device to the server in reply to the connection request packet, and transfers communications between the terminal and the device on the TCP connection after the TCP connection is established.
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8. A device connected to the Internet for communicating with a server connected to the Internet, wherein the device
transmits a notice packet periodically to the server, transmits a TCP connection request to the server when receiving a connection request packet from the server, and communicates with the server on the TCP connection after the TCP connection is established.
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15. A communication system comprising at least one device and a server those connected to the Internet, the system transferring communications between the at least one device and at least one terminal connectable to the Internet via the server, wherein
the device transmits a notice packet periodically to the server, the server transmits a connection request packet to the device in reply to the notice packet when transfer to the device is requested from the terminal, the device transmits a TCP connection request to the server when receiving the connection request packet from the server, and the server accepts the TCP connection request transmitted from the device to the server in reply to the connection request packet, thus to establish the TCP connection, thereby the server transfers communications between the terminal and the device on the TCP connection after the TCP connection is established.
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21. A server connected to the Internet for transferring communications between at least one device connected to the Internet, and at least one terminal connectable to the Internet, the server includes a storage section that stores the final access time in each device in a plurality of devices,
the server receives first and second notice packets periodically from the device, when receiving the first notice packet from the device, the server updates the final access time by the reception time, but not update the final access time when receiving the second notice packet from the device, when transfer to the device is requested from the terminal, the server rejects the connection request if the difference between the final access time of the device and the present time is over a specified period, or transmits the connection request packet to the device in reply to the first and second notice packets if the difference is within the specified period, and the server accepts a TCP connection request transmitted from the device to the server in reply to the connection request packet, thereby the server transfers communications between the terminal and the device on the TCP connection after the TCP connection is established.
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22. A device connected to the Internet for communicating with a server connected to the Internet,
the device transmits first and second notice packets periodically to the server, the transmission period of the first notice packet being longer than the transmission period of the second notice packet, and the device transmits a TCP connection request to the server when receiving a connection request packet from the server, thereby the device communicates with the server on the TCP connection after the TCP connection is established.
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23. A communication system comprising at least one device and a server those connected to the Internet, the system transferring communications between the at least one device and at least one terminal connectable to the Internet via the server, wherein
the server includes storage section that stores the final access time in each device in a plurality of devices, the device transmits first and second notice packets periodically to the server, the transmission period of the first notice packet being longer than that of the second notice packet, the server receives the first and second notice packets from the device, when receiving the first notice packet from the device the server updates the final access time by the reception time, but the server does not update the final access time when receiving the second notice packet from the device, when transfer to the device is requested from the terminal, the server rejects the connection request if the difference between the final access time of the device and the present time is over a specified period, or transmits the connection request packet to the device in reply to the first and second notice packets if the difference is within the specified period, the device transmits a TCP connection request to the server when receiving the connection request packet from the server, and the server accepts a TCP connection request transmitted from the device to the server in reply to the connection request packet, thus to establish the TCP connection, thereby the server transfers communications between the terminal and the device on the TCP connection after the TCP connection is established.
Specification