[flyinghamster]

For me, the IoT takeaway is, if you want to be able to trust it, you need to do it yourself. Commercial products seem to always want to sell your data to the highest bidder, aside from the potential firmware security problems.

At least with the Pi, Arduino, etc., you can control what your Things are doing, and have reasonable assurance they aren't doing things behind your back.

I have a Pi graphing outdoor and basement temperature and humidity using rtl433, MRTG, and some scripts, picking up the signals from existing temperature monitors. It's quite a surprise to see how much else is on 433 MHz in my neighborhood, even when using the stubby magnetic mount antenna that came with the RTL-SDR dongle.