Service Mediation Gateway for Heterogenous IoT Services Harmonization

To populate IoT service, having remote control on a smart device is not enough. More complicated IoT services are needed by combining each IoT service, and enabling communication between independent services are essential to them. There are several solutions and services to provide interactivity between IoT services in the market such as IFTTT or Muzzley. However, most of these services are implemented on the cloud, which makes it difficult to get prompt response for application request. In this paper, a Service Mediation Gateway is proposed to improve connectivity between IoT services with less response time. The proposed gateway is located between IoT services and the application, just like an edge or fog device, and works as a data cache for IoT resources on the cloud. The proposed gateway can be implemented both on the cloud and on the edge, so that provide more prompt response to the application. The proposed gateway has been implemented with existing IoT services, and the comparison with existing cloud services is evaluated.