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In this paper, a data aggregation gateway framework (DA-GW) for constrained application protocol (CoAP) group communications is proposed. The DA-GW framework is designed to improve the throughput performance and energy efficiency of group communication to monitor and control multiple sensor devices collectively with a single user terminal. The DA-GW consists of four function blocks-the message analyzer, group manager, message scheduler and data handler-and three informative databases-the clientdoi:10.3390/sym8120138 fatcat:fr7yt3u5pbf45emmvifwxw2k5y