Fig. 8. Response times for scaling a payload size.
Limitations and lessons learnt
The use of the CIM in the context of the DELTA project demonstrated to
the authors that semantic interoperability modules appear to be a viable
way for performing uplifting and down-lifting instead of adapters (which
are non-reusable pieces of software). However, the authors have observed
that developers frequently create ad hoc solutions for Uplifting while
ignoring Downlifting. As a result, while interoperability modules appear
to be a reasonable technology solution for achieving semantic
interoperability, greater distribution is required, and developers must
be educated to design and utilize them.
From the experimental part and the DELTA pilots’ implementation. The
authors discovered that in some circumstances, particularly in
high-latency settings, the time necessary to complete a data exchange
was insufficient. The authors investigated the cause of this
disadvantage and determined that XMPP networks are not the quickest
alternative. However, this is not a significant drawback because it is
fast enough for most DR circumstances. Nonetheless, for other cases,
such as DR with electric vehicles, new peer-to-peer systems should be
investigated.
Furthermore, whereas DR often necessitates live data and signal
transmission, payloads are typically small. However, certain DELTA
project pilots needed the transmission of previous data. These huge
payloads are unsuitable for XMPP networks. For this specific situation,
the answer in the project was chunking the data; nevertheless, in
circumstances where there is a definite requirement to exchange huge
payloads, XMPP is not an appropriate technological choice.