src/main/java/org/jivesoftware/smack/SmackConfiguration.java
public static void addSaslMech(String mech) {
        initialize();

        if (!defaultMechs.contains(mech)) {
            defaultMechs.add(mech);
        }
    }
public static void addSaslMech(String mech) {
        initialize();

        if (!defaultMechs.contains(mech)) {
            defaultMechs.add(mech);
        }
    }
Add a SASL mechanism to the list to be used.

@param mech
the SASL mechanism to be added