Hi, before buying I preferred to ask advice to you. I am pursuing a project that has the ambitious goal of bringing analytical accounting to farms. To do this I have to automate some processes. The process I now describe to you. I have to locate the perimeter of a geographic area. That is what I must identify who comes in and who comes out of this area. So I need a device on which to load the perimeter of a certain area. Also, this device every time it enters and exits that area, I must send a signal with information. This device must be equipped with an internal memory to store this information inside it. Which device do I recommend to buy at ST to start testing? In addition, this device has tutorials or documentation in general to allow me to program it. Thank you for your time. I await your news.