Added support for User-Agent (#7)

.gitignore

@@ -74,3 +74,5 @@ crashlytics.properties
 crashlytics-build.properties
 fabric.properties
 
+# VSCode
+.vscode

.travis.yml

@@ -14,3 +14,6 @@ branches:
 
 install:
   - go get -v -t ./...
+
+script:
+  - go test ./...

README.md

@@ -72,7 +72,7 @@ device, _ := sdk.NewDevice(deviceID, deviceToken)
 You can also customize behind-the-scenes functionality, in this case - HTTP and MQTT clients, by optionally providing endpoints for them. By default these are securely connecting to Maker:
 
 ```go
-device, _ := sdk.NewDevice("<DEVICE_ID>", "<DEVICE_TOKEN>", 
+device, _ := sdk.NewDevice("<DEVICE_ID>", "<DEVICE_TOKEN>",
 	sdk.WithHTTP("https://api.allthingstalk.io"),
 	sdk.WithMQTT("ssl://api.allthingstalk.io:8883"))
 ```

http_client.go

@@ -22,8 +22,9 @@ package sdk
 import (
 	"errors"
 	"fmt"
-	"github.com/dghubble/sling"
 	"net/http"
+
+	"github.com/dghubble/sling"
 )
 
 // HTTP Errors
@@ -35,6 +36,12 @@ var (
 	ErrCountNotFetchState = errors.New("Count not obtain current Asset state")
 )
 
+// Constants
+const (
+	// UA identifies the SDK
+	UA = "ATTalk-GoSDK/1.0.1"
+)
+
 type httpClient struct {
 	AssetService *assetService
 }
@@ -64,7 +71,10 @@ func newAssetService(httpClient *http.Client, device *Device) *assetService {
 	DEBUG.Printf("[HTTP] Using API endpoint: %s", apiEndpoint)
 
 	return &assetService{
-		sling: sling.New().Client(httpClient).Base(apiEndpoint),
+		sling: sling.New().
+			Client(httpClient).
+			Base(apiEndpoint).
+			Set("User-Agent", UA),
 	}
 }
 

options.go

@@ -21,7 +21,7 @@ func (f optionFunc) apply(device *Device) {
 	f(device)
 }
 
-const httpEndpoint string = "http://api.allthingstalk.io"
+const httpEndpoint string = "https://api.allthingstalk.io"
 const mqttEndpoint string = "ssl://api.allthingstalk.io:8883"
 
 // NewOptions creates default options.