There are several options for gateways, and building your own is a fantastic way to get your hands dirty and deep dive into the technology.
And is also very simple!! Here's a detailed step-by-step recipe of what to buy and how to build it.
How to start
The first thing you need to do is get all the parts you'll need: check the shopping list.
How to build it
With all the parts ready, you can put it together: check the detailed steps.
How to configure the software
Once everything is in place, you can start configuring it.
How to make it outdoors-ready
And finally, you might probably want to take the chance and put it on an outdoors-ready enclosure.
Congrats! You made it!