| 摘要 |
PROBLEM TO BE SOLVED: To update transmission conditions of sensor data in a M2M gateway present in a NAT/FW in real time from a M2M server located outside the NAT/FW and to avoid a non-response state of an entire system due to unexpected increase of loads.SOLUTION: A M2M gateway 104 acquires sensor list information indicating a list of a sensor 101 on each sensor device 102 connected by a sensor network 103 and transmits the sensor list information to a M2M server 107. The M2M gateway 104, after transmitting the sensor list information, performs long polling communication so as to continuously wait until sensor data transmission instruction information indicating transmission conditions of sensor data returns from the M2M server 107 while maintaining connection with the M2M server 107. The M2M gateway 104, upon receiving the sensor data transmission instruction information from the M2M server 107, disconnects connection with the M2M server, subsequently, reconnects to the M2M server 107 to perform the long polling communication again. |
