Currently, mobile technologies are present in our daily day in different activities and their use keeps increasing. In this context, proxemic interaction, derived from proxemic theory, is becoming an influential approach to implement Mobile Human-Computer Interaction (MobileHCI) in smart environments, based on five proxemic dimensions: Distance, Identity, Location, Movement, and Orientation (DILMO). The existing tools for implementing proxemic applications require fixed devices that make it difficult to built mobile proxemic apps. This work aims to propose a framework for the development of proxemic applications for smart environments comprised by entities, whose interactions are supported by MobileHCI defined in terms of DILMO dimensions. Our proposed framework allows defining and managing all components in a smart proxemic environment. The framework also provides an API, that allows developers to simplify the process of proxemic information sensing (i.e., detection of DILMO dimensions) from mobile phones and wearable sensors. We demonstrate and evaluate the effectiveness and suitability of our framework, through the proof-of-concept which describes the implementation of two proxemic mobile applications built in a context-based infrastructure for smart proxemic environments based on mobile devices.