Review on LinkSprite LinkNode ESP 12F Controller （LN_RELAY4CH） by Adrian Hayes

I've been using it for a day or two now. It took a bit of fiddling to flash with my own .ino. There are countless copy and paste guides online showing how to do this. I've never tried connecting directly to it or downloading an app, so I can't comment on the software side of this device. I was only interested in writing code for it myself. I wish they would break out more pins for sensors etc. You can solder some onto yourself as the leads are exposed at 12. It's a good price too. You can't buy the parts individually at this price point, and the time and energy savings in wiring and commercializing the form factor is huge. I will buy many more of these.