Add amqp support

yabl/strings.go

@@ -1,6 +1,10 @@
 package yabl
 
-import "fmt"
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+)
 
 func (t BooleanType) String() string {
 	switch t {
@@ -211,3 +215,19 @@ func (t SignedAirTemp8BitType) String() string {
 func (c ConnectedOut8bitType) String() string {
 	return fmt.Sprintf("%d", c)
 }
+
+func (u *Event) MarshalJSON() ([]byte, error) {
+	return json.Marshal(struct {
+		Unit       uint
+		ActionName AName
+		Field      FName
+		Updated    *time.Time
+		Value      string
+	}{
+		Unit:       u.GetUnitId(),
+		ActionName: u.ActionName,
+		Field:      u.Field,
+		Updated:    u.Updated,
+		Value:      fmt.Sprintf("%v", u.Value),
+	})
+}