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ports knowledge sharing within a thematic network.
Whilst HelpMe! uses human-based services, the mid-
dleware can be used to publish automated services:
for example, in a war game on a closed field, the ap-
plication can query the devices of its own team, to
know the GPS positions.
In the current implementation, data items are ex-
changed using JSON based messages; for the future,
we are working towards providing developers with
methods for sending large-size data. In particular,
we are exploring two directions: (i) using TCP based
communication, which implies bypassing Sip2Peer
communication and developing a proprietary low-
level communication layer; (ii) fragmenting the data
to be sent into several chunks, and implementing a
layer to reconstruct the original data onto the receiver
device. Another area of investigating is binary object
management, such as images or videos. Currently, the
exchange of binary files is handled outside the mid-
dleware, and diverges slightly from the Android ap-
proach. In fact, on a single device, Android does not
need to transfer the whole file, but only its reference,
which is stored in the device. In the remote scenario,
the middleware needs to transfer the file, or to upload
it on some server known to the network of peers.
In the current version of the middleware we have
neglected the privacy aspect of peer-to-peer for the
future, the middleware will need to support privacy
and security policies for peer interactions. We in-
tend to include in Sip2Share a trust component that
can block some peers, and in general assigns ranks to
peers, based on past activities; e.g. in the HelpMe!
example a particular peer that sends a lot of spam for
many different topics.
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