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Recent Low-Power Wide Area Networks (LPWAN) networks, e.g. Lora, introduce a high level of flexibility when deploying IoT devices. However, this flexibility also raises some performance issues that can become critical when introducing innovative IoT devices such as image sensor devices. This paper presents 2 control mechanisms to enable the deployment of such image sensor devices with LPWAN technologies: (i) an adapted Carrier Sense Multiple Access (CSMA) mechanism to avoid costly packet collision and (ii) an activity time sharing mechanism to mitigate the issue of duty-cycle. Both mechanisms show their efficiency in real experiments.