Was planning on building a few temp sensors. It's going to be part of a research project that I'm doing for my studies. Was looking at using sigfox but man oh man is that subscription pricey and I haven't even dug into all that certification stuff.
Planning on having about 20 devices. They'll all sample temperature say every 10 mins and transmit this. I want something that can work well on battery and not have a really big subscription cost.
Anyone have some advice with how I can proceed?