package openzwave

import "log"

// A logger interface. Modelled on github.com/juju/loggo so that can be used substituted by default.
type Logger interface {
	// Log an info message.
	Infof(message string, args ...interface{})
	// Log a warning message.
	Warningf(message string, args ...interface{})
	// Log an error message.
	Errorf(message string, args ...interface{})
	// Log a debug message.
	Debugf(message string, args ...interface{})
	// Log a trace message.
	Tracef(message string, args ...interface{})
}

type defaultLogger struct {
}

func (defaultLogger) Infof(message string, args ...interface{}) {
	log.Printf(message, args...)
}

func (defaultLogger) Warningf(message string, args ...interface{}) {
	log.Printf(message, args...)
}

func (defaultLogger) Errorf(message string, args ...interface{}) {
	log.Printf(message, args...)
}

func (defaultLogger) Debugf(message string, args ...interface{}) {
	log.Printf(message, args...)
}

func (defaultLogger) Tracef(message string, args ...interface{}) {
	log.Printf(message, args...)
}

package openzwave

import "fmt"

// A logger interface. Modelled on github.com/juju/loggo so that can be used substituted by default.
type Logger interface {
	// Log an info message.
	Infof(message string, args ...interface{})
	// Log a warning message.
	Warningf(message string, args ...interface{})
	// Log an error message.
	Errorf(message string, args ...interface{})
	// Log a debug message.
	Debugf(message string, args ...interface{})
	// Log a trace message.
	Tracef(message string, args ...interface{})
}

type defaultLogger struct {
}

func (defaultLogger) Infof(message string, args ...interface{}) {
	fmt.Printf(message, args...)
}

func (defaultLogger) Warningf(message string, args ...interface{}) {
	fmt.Printf(message, args...)
}

func (defaultLogger) Errorf(message string, args ...interface{}) {
	fmt.Printf(message, args...)
}

func (defaultLogger) Debugf(message string, args ...interface{}) {
	fmt.Printf(message, args...)
}

func (defaultLogger) Tracef(message string, args ...interface{}) {
	fmt.Printf(message, args...)
}

--- 
+++ 
@@ -1,6 +1,6 @@
 package openzwave
 
-import "fmt"
+import "log"
 
 // A logger interface. Modelled on github.com/juju/loggo so that can be used substituted by default.
 type Logger interface {
@@ -20,21 +20,21 @@
 }
 
 func (defaultLogger) Infof(message string, args ...interface{}) {
-	fmt.Printf(message, args...)
+	log.Printf(message, args...)
 }
 
 func (defaultLogger) Warningf(message string, args ...interface{}) {
-	fmt.Printf(message, args...)
+	log.Printf(message, args...)
 }
 
 func (defaultLogger) Errorf(message string, args ...interface{}) {
-	fmt.Printf(message, args...)
+	log.Printf(message, args...)
 }
 
 func (defaultLogger) Debugf(message string, args ...interface{}) {
-	fmt.Printf(message, args...)
+	log.Printf(message, args...)
 }
 
 func (defaultLogger) Tracef(message string, args ...interface{}) {
-	fmt.Printf(message, args...)
+	log.Printf(message, args...)
 }
Use log, rather than printf.
