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As long-range technologies allow for simpler connectivity of remote devices, a tremendous increase of the device density proposing innovative services is expected in the next years. In this article, we consider a dense deployment of IoT devices generating a wide range of message sizes: short messages from traditional telemetry devices, medium-size message from multi-sensors devices and large message from image sensors. We investigate how a Carrier Sense mechanism can be adapted for LoRa networks to decrease collisions, taking into account this variety of message sizes and the difficulty to get a reliable free channel indication. We show experimental results on a large-scale IoT LoRa test-bed implementing various use-cases from the EU H2020 WAZIUP project targeting IoT deployment in developing countries.