Communication device, control system, and communication method

1. A control system comprising:

a server device that controls multiple apparatuses installed in multiple homes; and

multiple communication devices each of which sends a notification to the server device indicating that setting of an apparatus installed in one of the multiple homes has been changed, wherein

each of the communication devices being arranged between the apparatus installed in one of the multiple homes and the server device and includes

a memory; and

a processor coupled to the memory and configured to:

determine, when setting information which is changed in stages and related to a predetermined item is received from a predetermined apparatus which sends setting information to the communication device whether there is a change in the setting information, whether another piece of setting information which is changed in stages and related to the same predetermined item is newly received from the predetermined apparatus before a predetermined time period elapses after the setting information, which is changed in stages, is received,

send, when it is determined that the another piece of setting information is not newly received from the predetermined apparatus before the predetermined time period elapses, the received setting information to the server device, and

calculate the predetermined time period based on a reception interval of the setting information, which is changed in stages, from the predetermined apparatus,

the server device includes a processor that controls the predetermined apparatus on the basis of the setting information sent from one of the communication devices,

wherein the processor of the communication device sends the calculated predetermined time period to the server device, and determines whether another piece of setting information which is changed in stages and related to the same predetermined item is newly received from the predetermined apparatus before the predetermined time period elapses, until a notification of a new predetermined time period is received from the server device.

2. The control system according to claim 1 , wherein

the processor of each of the communication devices is further configured to

calculate a candidate for the predetermined time period on the basis of an average value of time intervals at each of which setting information related to the predetermined item is received from the predetermined apparatus, and

notify the server device of the calculated candidate for the predetermined time period, and

the processor of the server device is further configured to

decide the predetermined time period by using the candidate for the predetermined time period notified by each of the communication devices, and

notify each of the communication devices of the decided predetermined time period, and

the processor determines whether the another piece of setting information related to the predetermined item is newly received from the predetermined apparatus before the predetermined time period notified by the server device elapses.

3. The control system according to claim 2 , wherein the processor calculates an average value of candidates for the predetermined time periods received from each of the communication devices and a standard deviation, extracts, from among the candidates for the predetermined time periods, one or more candidates for the predetermined time period with a value that is within a range obtained on the basis of the calculated average value and the standard deviation, and sets, as the predetermined time period, a value obtained by multiplying one candidate with a maximum value among the extracted one or more candidates, by a predetermined rate.