refactor(db): add constante for defaultTimeout

db/src/mqtt/mqtt.go

@@ -14,7 +14,10 @@ import (
 	mqtt "github.com/eclipse/paho.mqtt.golang"
 )
 
-const maxQoS = 2
+const (
+	maxQoS       	= 2
+	defaultTimeout	= 5 * time.Second
+)
 
 // A MqttParams is the abstracted MQTT gateway.
 // It provides the MQTT parameters to initialize the connection and the method to add data.
@@ -77,7 +80,7 @@ func NewMqttGateway(p MqttParams) (*MqttGateway, error) {
 
 	if p.Timeout == 0 {
 		// Set to default value
-		p.Timeout = time.Second * 5
+		p.Timeout = defaultTimeout
 	}
 
 	opts := mqtt.NewClientOptions()