@Arjan I don't fully agree about not using GPS in nodes: you could have the GPS turned off completely and let a another sensor (movement, change of angle, noise) be the trigger to turn the GPS on and send the location of the node. Using the bi-directional possibilities of the network to let energy-friendly sensors trigger other, more energy consuming sensors and switches+devices, is the way to go for many smart usecases and still have nodes that run for years on an single battery charge!
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