A lightweight data interchange format for Internet of Things in the PalCom middleware framework.

We present the PalCom Object Notation, a textual data representation format for communication between internet of things which support binary and textual data. The format does not require parsing of user data (or the "payload") and is thus efficient to use also for large binary values such as digital images, audio and video as well as for short textual values. These can be mixed in the same messages and thus transported over the same communication link. Its structure is influenced by JSON, making it easy to translate between the two formats. The evaluation show that its size and processing efficiency is comparable to that of JSON for small data, but becomes both smaller and more efficient as data grows, and can yield a tenfold performance increase for binary payloads. (C) 2015 The Authors. Published by Elsevier B.V.