To save money they could come with LoRA radios and sync when the opportunity arrises to a LoRA gateway, including meshing with each other to aggregate data to i

To save money they could come with LoRA radios and sync when the opportunity arrises to a LoRA gateway, including meshing with each other to aggregate data to increase the likeliness of encountering a gateway. LoRA modules are pretty cheap. https://www.thethingsnetwork.org/ https://www.thethingsnetwork.org/