Suppose we have to build a web portal for an indoor air quality system. The portal needs to display the air pollutant readings sent by the air quality sensing device. The web portal has a subscription based model where every user is allowed to see the air quality parameters readings sensed by his/her device on the web portal after subscribing to the system. However, the company owning the system can view all users’ devices data on the web portal for further advance analytics. The users are provided with interactive info graphics to see the real time status of their surrounding indoor ambience, and the interfaces are kept as simple as possible to increase the system usability. Considering the above system, which design pattern or patterns are most suitable?

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