SparkFun SAMD21 Pro RF Hookup Guide
Elias The Sparkiest 
Using the Data
Okay, so now you have data coming into your TTN application but what do you do with it? Well, you have a few options:
APIs
The most basic endpoints for interacting with The Things Network programmatically are the TTN Handler APIs or "application programming interfaces". There are two APIs, the Data API and the Application Manager API. The Data API allows you to send and receive messages, making it the most useful for most applications. You can interact with this API using the MQTT protocol. The Application Manager API is available directly through HTTP and lets you manage applications, gateways, and devices. It's much more powerful than the Data API and is mostly intended to allow endpoint applications to perform device management.
SDKs
The Things Network has also created several Software Developer Kits (SDKs) which allow you to program your application without having to interact directly with the low level APIs. SDKs are available for several popular languages.
Integrations
Finally, the easiest way to access your data and put it to work is with The Things Network's various platform integrations. Integrations allow you to pass your application data directly to another platform such as AWS IoT, Cayenne, EVRYTHNG, or IFTTT. From there, you can use those platforms to interact with your data.