I am developing a library that uses SSHJ for SFTP transfer. Since requests are frequent, I have wondered whether I could just keep the connection open.
Obviously, this will achieve nothing if the server frequently times out the connection.
Since I have no control of the server, I have to keep the connection alive:
With a regular SSH client, I could specify a ServerAliveInterval and have the client do it for me.
I'd like to do the same with SSHJ, but I do not know what message to send.
The SSH manual just states that ServerAliveInterval
Sets a timeout interval in seconds after which if no data has been received from the server, ssh(1) will send a message through the encrypted channel to request a response from the server.
So I'm wondering: What message is sent? How could I reproduce this message through SSHJ?
Sorry this isn't documented, but you can set a heartbeat: