Afak glftpd doesn't support it. Perhaps you could add option to force send noops without timeout for response (is there is any?) - this would keep control connection alive even if server wasn't supporting it. Server would most likely reply to all noops after transfer finishes (ie, with 3min interval between noopping - it makes 20noop responses after ~60min transfer.. Noop command itself, is so short that you can fit hundreds of those into socket buffer, that's why server doesn't have to be monitoring for them)
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