In this paper, we present our experience in implementing an experimental end-node architecture and communications middleware that enables devices to (a) create and maintain ad-hoc connectivity in the absence of infrastructure support, (b) heal IP network partitions and resume active TCP sessions during intermittent connectivity, (c) detect network infrastructure (e.g. access points) when available and use it, and (d) discover devices and services currently attached to the network. In broader terms, our communications middleware includes a connection manager (CM) that provides and maintains the link-level and IP infrastructures and heal network partitions as they occur, arid a session manager (SM), which provides end-to-end active TCP-session support against intermittent connectivity and IP address changes. Finally, we provide some experimental results from a working implementation of our communications middleware on Linux devices and results from its support, of two example distributed applications, namely a distributed file browser and a multiplayer game

In this paper, we present a new tree-based Bluetooth (BTH) scatternet formation and healing protocol called GC-tree, Our protocol enables group collaboration, e.g. wireless ad-hoc meetings, where individuals bring piconets with their devices in a scatternet to collaborate. We present experimental performance results from a prototype implementation using uff-the-self BTH v1.1 hardware and Linux-based devices. Finally, we complement our experimental results with a realistic simulation model

This paper investigates a real-world problem termed "Bluetooth (BTH) pollution", which is expected to become commonplace as the mass deployment of BTH devices continues. BTH pollution is caused by the presence of a large number of noncooperating BTH devices within the same radio coverage area, which beyond introducing radio interference, also affect each other's basic BTH operations such as discovery, paging and connection setup. The overall result can be a significant slow-down in BTH networking operations, e.g. ad-hoc network formation and healing. We believe the effect of BTH pollution is largely ignored in the BTH ad-hoc networking literature. In this paper we provide an insight on the causes of this problem, as well as simulation and experimental results that illustrate it. Finally, we propose a solution to accelerate BTH ad-hoc networking based on the use of the class of device (CoD) information specified in the BTH standard