Implements a ping listener from XEP-0199 XMPP ping.
In the future, we can send an XMPP ping to the server to check for the state
of the connection.
package net.java.otr4j.crypto;
import net.java.otr4j.OtrException;
@SuppressWarnings("serial")
public class OtrCryptoException extends OtrException {
public OtrCryptoException(Exception e) {
super(e);
}
}