[QUESTION] Connect to a remote server, attach to a tmux session, run a command

[sla-te]

Doing tmux send-keys ... does of course work but will require to use pipe-paneand results in only having a log file to tail the piped stdout/err from the tmux session..

If going:

from fabric import Connection
c = Connection('root@192.168.1.1')
c.run("tmux attach-session -t my_session", pty=True)
# i want to run commands inside the attached session now

Obviously it will block at c.run and provide interactive terminal to the tmux session on the server we connected to. Disabling pty will yield to the "not a terminal" error.

What is the way to attach to a potentially already existing tmux session on a remote machine, run commands and cleanly get the exit codes, stderr, stdout using fabric?