ClearCommandChannel Method
Sends CCC (Clear Command Channel) command to the server.
Syntax
ftpclient.clearCommandChannel(gracefulSSLClosure, [callback])
Callback
The 'callback' parameter specifies a function which will be called when the operation completes (or an error is encountered). If the 'callback' parameter is not specified, then the method will block and will not return until the operation completes (or an error is encountered).
The callback for this method is defined as:
function(err){ }
'err' is the error that occurred. If there was no error, then 'err' is 'null'.
'err' has 2 properties which hold detailed information:
err.code err.message
Remarks
Use this method to send a CCC command. CCC clears command channel encryption state, turning off TLS encryption.
Some servers expect this command to allow for the control channel to be properly handled by NATs.