Allow transports to define their own ping mechanism

xmpp_transport.go

@@ -2,6 +2,7 @@ package xmpp
 
 import (
 	"crypto/tls"
+	"errors"
 	"net"
 	"time"
 )
@@ -59,6 +60,17 @@ func (t *XMPPTransport) StartTLS(domain string) error {
 	return nil
 }
 
+func (t XMPPTransport) Ping() error {
+	n, err := t.conn.Write([]byte("\n"))
+	if err != nil {
+		return err
+	}
+	if n != 1 {
+		return errors.New("Could not write ping")
+	}
+	return nil
+}
+
 func (t XMPPTransport) Read(p []byte) (n int, err error) {
 	return t.conn.Read(p)
 }