Dynamic wireless networks, and especially mobile ad hoc networks, impose new constraints regarding the design and the implementation of service-oriented middleware platforms dedicated to mobile computing. Indeed from now, these platforms must be able to capture the context in which they operate in order to provide the services they host with an abstraction of their running context, and to notify them of the variations occurring in this context. These middleware platforms must also implement communication means that make it possible for services to support the frequent and unpredictable connection disruptions. In this paper, we present the design of a serviceoriented middleware platform capable of environmental context introspection and of asynchronous communications.