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The exponentially growing number of devices connected to the Internet, the diversity of the Internet of Things (IoT), and the variety of IoT protocol stacks yield to concerns about IoT sustainability. A promising solution is in IoT integration platforms which can address challenges such as interoperability, scalability and adaptability surrounding IoT. Current implementations of IoT platforms are based on centralised architectures, yet a decentralised IoT architecture with logic moved to the (network) edge can offer several benefits to IoT platforms and devices. This paper identifies the feature set that a decentralised IoT platform should have. Based on the determined features, a general decentralised IoT architecture is proposed for efficient resource utilisation.