| CPC H04W 48/16 (2013.01) [H04W 76/25 (2018.02); H04L 67/12 (2013.01)] | 6 Claims |

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1. A communication device for transmitting data to a server in response to receiving a read command from the server, the data being specified by the read command, the communication device comprising:
a communicator configured to:
transmit, to the server, an update request message for extending a lifetime indicating a period in which communication between the communication device and the server is enabled, the update request message includes a value of an extended lifetime;
transmit, in a case where there is transmission data from the communication device to the server, the update request message including read request information for requesting the server to read the transmission data, the read request information including a data identifier identifying a type of the transmission data that the server is requested to read;
receive, from the server, a read command for acquiring the transmission data requested by the read request information, the type of the transmission data identified by the data identifier included in the read request information; and
transmit, to the server, a response including the transmission data requested by the read request information in response to receiving the read command, the type of the transmission data identified by the data identifier included in the read request information, wherein,
the communicator is configured to:
receive, from the server, a notification instruction command including information for specifying data included in a notification message;
after receiving the notification instruction command from the server, transmit, to the server, the notification message including the data specified by the notification instruction command, at a timing when the data specified by the notification instruction command is changed and at a time interval specified by the notification instruction command; and
in a case where there is transmission data other than the data specified by the notification instruction command when the notification message is transmitted, transmit the notification message including the read request information, the read request information including a data identifier identifying a type of the transmission data that the server is requested to read.
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