src/main/java/org/jivesoftware/smack/XMPPConnection.java
void startTLSReceived(boolean required) {
        if (required
                && config.getSecurityMode() == ConnectionConfiguration.SecurityMode.disabled) {
            notifyConnectionError(new IllegalStateException(
                    "TLS required by server but not allowed by connection configuration"));
            return;
        }

        if (config.getSecurityMode() == ConnectionConfiguration.SecurityMode.disabled) {
            // Do not secure the connection using TLS since TLS was disabled
            return;
        }
        try {
            writer.write("<starttls xmlns=\"urn:ietf:params:xml:ns:xmpp-tls\"/>");
            writer.flush();
        } catch (IOException e) {
            notifyConnectionError(e);
        }
    }
void startTLSReceived(boolean required) {
        if (required
                && config.getSecurityMode() == ConnectionConfiguration.SecurityMode.disabled) {
            notifyConnectionError(new IllegalStateException(
                    "TLS required by server but not allowed by connection configuration"));
            return;
        }

        if (config.getSecurityMode() == ConnectionConfiguration.SecurityMode.disabled) {
            // Do not secure the connection using TLS since TLS was disabled
            return;
        }
        try {
            writer.write("<starttls xmlns=\"urn:ietf:params:xml:ns:xmpp-tls\"/>");
            writer.flush();
        } catch (IOException e) {
            notifyConnectionError(e);
        }
    }
void startTLSReceived ( boolean required ) { if ( required && config . getSecurityMode ( ) == ConnectionConfiguration . SecurityMode . disabled ) { notifyConnectionError ( new IllegalStateException ( "TLS required by server but not allowed by connection configuration" ) ) ; return ; } if ( config . getSecurityMode ( ) == ConnectionConfiguration . SecurityMode . disabled ) { // Do not secure the connection using TLS since TLS was disabled return ; } try { writer . write ( "<starttls xmlns=\"urn:ietf:params:xml:ns:xmpp-tls\"/>" ) ; writer . flush ( ) ; } catch ( IOException e ) { notifyConnectionError ( e ) ; } }
Notification message saying that the server supports TLS so confirm the
server that we want to secure the connection.

@param required
true when the server indicates that TLS is required.
Notification message saying that the server supports TLS so confirm the server that we want to secure the connection .