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Having connectivity as a pivotal element, Internet of Things (IoT) systems rely on wireless technologies to provide communication to end devices. A growing set of technologies, designated as Low-Power Wide Area Networks (LPWANs), are becoming prominent technologies for smart cities applications due to their long range, effective cost and energy efficiency. The purposed multi-technology opportunistic platform for environmental data gathering addresses the heterogeneity of IoT devices, through the employment of multi-technology communications, LoRa and WiFi, and serves as infrastructure for a network with opportunistic communication capabilities. Furthermore, to increase the operability of the proposed platform, we present and evaluate a novel Medium Access Control (MAC) scheme capable of supporting a reliable communication through LoRa technology over a multi-sink environment without direct …