The official Machine Box Go SDK provides Go clients for each box.
Go get the repo:
go get github.com/machinebox/sdk-go
Then import the package of the box you wish to use:
import "github.com/machinebox/sdk-go/facebox"
Then create a client, providing the address of the running box.
(To get a box running locally, see the instructions at https://machinebox.io/account)
faceboxClient := facebox.New("http://localhost:8080")