In an always-on and everything connected context, mobile applications are more and more interacting with sensitive or personal resources hosted in cloud computing or Internet of Things infrastructure. As a consequence, security and trust are critical issues, and likely a prerequisite for the deployment of IoT frameworks. 
Among other, the NFC technology enables communication in close proximity. With NFC mobiles surfacing the market so quickly, mobile operating systems are prepared for support with dedicated frameworks. This offers researchers and developers a great opportunity for getting quick traction with novel applications. 
So far, the main close proximity enabled services deal with payment, access control, or ticketing. Commercial applications today mainly target mobile payments, or eTickets managed by transportation companies. The broad availability of communication technologies fertilizes research and development of novel applications and can go well beyond these intended applications.