The advent and increasing trend of context-aware systems push current systems towards new requirements. Context-aware systems are usually built upon a middleware to ease its development and fulfill those requirements, being provided of robustness and services to be used very quickly. However, most of those middlewares were designed thinking of small context-aware systems rather than big world-wide interconnected systems. Some of the requirements of these scenarios not fulfilled by the former middlewares such as mobility, scalability and dynamicity are addressed in this work providing a context-aware middleware of distributed rule reasoning capabilities.