Add empty data to SSH_MSG_IGNORE messages #974
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As required by RFC 4253 Section 11.2, and RFC 4251 Section 5
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Resolves #967.
The PR adjusts the
Heartbeatersuch that it sends empty data, i.e. a length information of 0, with itsSSH_MSG_IGNOREmessage.Basically anything could be sent as data. Alternatively, random bytes could be sent, or a constant string like e.g. Apache Mina SSHD does: https://github.com/apache/mina-sshd/blob/master/sshd-core/src/main/java/org/apache/sshd/common/session/helpers/AbstractConnectionService.java#L89