Demo Abstract: MOS: A Bandwidth-Efficient Cross-Platform Middleware for Publish/Subscribe

Shared dictionary compression is known as an efficient compression method for pub/sub. In practice, bandwidth reductions of more than 80% are achievable for JSON or XML data formats. Compared to other compression techniques such as GZip or Deate, a dictionary is needed to compress and decompress messages. Generating a dictionary is a CPU-expensive task and sharing it introduces bandwidth overheads. Furthermore, the dictionary is continuously maintained to keep the compression performance high. We developed MOS: a cross-platform middleware for managing shared dictionary compression in pub/sub. This includes dictionary propagation, compression/decompression, and periodic maintenance. We provide a developer API to interact with the MQTT-based pub/sub infrastructure. Our demo shows an example application built on top of MOS which shows the performance of the shared dictionary compression scheme.