Server apparatus communicating with a client apparatus via the internet, system, and control method thereof

摘要

A server apparatus receives a query from a client apparatus connected via the Internet, and as its reply, it transmits first condition information according to which initial communication is performed in order to switch to a specific communication format in which instruction from the server apparatus is possible without a request of the client apparatus.

主权项

1. A server apparatus that communicates with a client apparatus via the Internet, the server apparatus comprising:
a memory, and a processor in communication with the memory, the processor configured to control:
a first communication unit configured to support a network communication in HTTP;a second communication unit configured to support a network communication in a specific communication mode in which instruction from the server apparatus is possible without a request from the client apparatus, wherein the specific communication mode is a protocol different from the HTTP;a receiving unit configured to receive a query from the client apparatus via the first communication unit;a transmitting unit configured to transmit, via the first communication unit, as a reply to the received query, first condition information including information of a condition triggering performance of an initial communication in order to switch to the specific communication mode, wherein the first condition information includes, as the information of the condition, information about a trigger event detected by the client apparatus; andan instructing unit configured to switch to the specific communication mode by performing the initial communication with the client apparatus according to the first condition information, and configured to transmit, via the second communication unit, an instruction to the client apparatus in the specific communication mode.