Nintendo released the 3.0.0 version update for the Nintendo Switch console. With the latest update what you can download for free from once you connected with it to the internet you can use third-party controllers and you can even send Friend applications to the Nintendo 3DS and the Wii U users too.
The exactly details of the update can be found in here (Japanese): https://www.nintendo.co.jp/support/switch/system_update/index.html#latest