The Arrowhead Framework, a SOA-basedframework for IoT applications, provides the Event Handlersystem: a publish/subscribe broker implemented withREST/HTTP(S). However, the existing implementation of theEvent Handler suffers from message latency problems that arenot acceptable for industrial applications. Thus, this paperdescribes the refactoring process of this system that enabled itto reach acceptable levels of latency. Abstract-The Arrowhead Framework, a SOA-based framework for IoT

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... s, provides the Event Handler system: a publish/subscribe broker implemented with REST/HTTP(S). However, the existing implementation of the Event Handler suffers from message latency problems that are not acceptable for industrial applications. Thus, this paper describes the refactoring process of this system that enabled it to reach acceptable levels of latency.