use SKIP instead of LAST for fetching messages after polling

command.go

@@ -55,6 +55,38 @@ func (app *App) Poll(since int) (num int, err error) {
 	return num, nil
 }
 
+func (app *App) Skip(since int) (num int, err error) {
+	if _, err := fmt.Fprintf(app.conn, "SKIP %d\n", since); err != nil {
+		return 0, err
+	}
+
+	if !app.scanner.Scan() {
+		return 0, app.scanner.Err()
+	}
+	num, err = strconv.Atoi(app.scanner.Text())
+	if err != nil {
+		return 0, err
+	}
+
+	for range num {
+		if !app.scanner.Scan() {
+			return 0, err
+		}
+		app.incoming <- Message(app.scanner.Text())
+	}
+
+	if !app.scanner.Scan() {
+		return 0, app.scanner.Err()
+	}
+	last, err := strconv.Atoi(app.scanner.Text())
+	if err != nil {
+		return 0, err
+	}
+	app.incoming <- Last(last)
+
+	return num, nil
+}
+
 func (app *App) Last(n int) (num int, err error) {
 	if n == 0 {
 		return 0, nil

event.go

@@ -30,7 +30,11 @@ func (p Poll) HandleOutgoing(app *App) error {
 	if err != nil {
 		return err
 	}
-	num, err = app.Last(num)
+	if num == 0 {
+		return nil
+	}
+
+	num, err = app.Skip(app.last)
 	if err != nil {
 		return err
 	}
@@ -48,7 +52,11 @@ func (p ManualPoll) HandleOutgoing(app *App) error {
 		return err
 	}
 	app.incoming <- ManualPoll(num)
-	num, err = app.Last(num)
+	if num == 0 {
+		return nil
+	}
+
+	num, err = app.Skip(app.last)
 	if err != nil {
 		return err
 	}