Embedded systems are specialised computers used in larger systems or machines to control equipments such as automobiles, home appliances, communication, control and office machines. Such pervasivity is particularly evident in immersive realities, i.e., scenarios in which invisible embedded systems need to continuosly interact with human users, in order to provide continuous sensed information and to react to service requests from the users themselves. The SM4ALL project will investigate an innovative middleware platform for inter-working of smart embedded services in immersive and person-centric environments, through the use of composability and semantic techniques for dynamic service reconfiguration. By leveraging on P2P technologies, the platform is inherently scalable and able to resist to devices' churn and failures, while preserving the privacy of its human users as well as the security of the whole environment. This is applied to the challenging scenario of private houses and home-care assistance in presence of users with different abilities and needs (e.g., young able bodied, aged and disabled).The specific composition of the Consortium, consisting of top-class universities and research centers (UOR, TUW, RUG, KTH and FOI), of user partners specialized in domotics and home-care assistance (FSL and THFL) and a SME specialized in specific brain-computer interfaces (GTEC), and of leader companies in the embedded sector (TID and ED) guarantees a widespread dissemination and exploitation of the project results, coupled with a privileged position inside ARTEMIS and ARTEMISIA (due to the presence of UOR, TUW and ED in such bodies).