Part of designing any system requires the development of an architecture on which the system and subsequent implementations are based. The architecture will vary depending on the requirements. For a healthcare monitoring application the researchers developed a four-tiered architecture that consists of the following layers: user interface, process management, database and sensor network. In this paper, the authors present their layered architecture for remote healthcare monitoring of aged and infirm persons and illustrate its advantages by describing their latest prototype which is called MoteCare. They also discuss the direction the researchers intend to take for the development of their fourth prototype, paying particular attention to the use of open source databases, the issue of security in the development of mote sensor networks (MSN) and the advantages of linking such systems with wireless broadband to enable potential users to achieve more mobility options.