YADE SFTP - sshj provider - KeepAlive functionality is broken

Current Situation

• Starting with YADE-527, YADE supports sending keep-alive messages.
• Starting with YADE-593, the default SSH provider was changed to SSHJ.
  • The keep-alive functionality for this provider is broken, and the ServerAliveInterval/ServerAliveCountMax settings have no effect.

Desired Behaviour

• The keep-alive functionality should work with all SSH providers.

Workaround

• Switch back to the JSCH provider (see YADE-593, YADE-577).
  • Note: If the affected YADE is used on a jump host, the JumpCommand can be extended to:
    • JumpFragments -> JumpCommand: <install>/yade.cmd|.sh -ssh_provider=JSCH
• Or apply patch:
  • Unzip the patch yade-1.13.22-PATCH-1.YADE-625.zip to the <yade install>/lib/patches directory.

Test Instructions

• Configure YADE to use ServerAliveInterval=10s, ServerAliveCountMax=3.
• Ensure that the SSHJ provider is being used.
• Example on a Windows OpenSSH Server:
  • configure a Post|PreProcessing command: @powershell Start-Sleep -Seconds 30
  • check the OpenSSH Server logs to find (messages should be sent every 10 seconds):
    • debug1: server_input_global_request: rtype keepalive@openssh.com want_reply 1