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This paper presents a REST-compliant service oriented architecture of a web-based heterogeneous wireless sensor network monitoring system that has applicability in remote patient monitoring in healthcare. As smartphone and web-page technologies are ubiquitous nowadays, our architecture uses smartphone as a gateway between the data collected and the Internet. The system uses a heterogeneous WSN consisting of environmental sensors, medical sensors, and smartphone's internal sensors. To validate the system, a prototype experiment of the system is implemented using Android smartphone platform, Crossbow Micaz motes, and Alive Technology hart and activity monitor sensor.