How to recover a shell after a disconnection?

It is not possible! but the cure is tmux. I start tmux, start the operation and go on my way. If I return and find the connection has been broken, all I have to do is reconnect and type tmux attach

For installing tmux on Mac:
   brew install tmux
tmux in the top image is running with vtop on the top pane and PM2 on the bottom.
Here is the cheatsheet for tmux: