func (i FailureMessage) Signature() int {
	return FailureMessageSignature
}
Signature gets the signature byte for the struct
package messages
import "fmt"
const (
	FailureMessageSignature = 0x7F
)
type FailureMessage struct {
	Metadata map[string]interface{}
}
func NewFailureMessage(metadata map[string]interface{}) FailureMessage {
	return FailureMessage{
		Metadata: metadata,
	}
}