Cleanup TRAMP connections prior to sleeping with Hammerspoon

onsleep.lua

local cw = require "hs.caffeinate.watcher"
function cleanup_tramp_on_sleep(ev_type)
   if ev_type == cw.systemWillSleep then
      hs.execute("/usr/local/bin/emacsclient -e " ..
		 "'(when (tramp-list-connections) " ..
		 "  (message \"Cleaning up TRAMP before sleep\") " ..
		 "  (tramp-cleanup-all-connections))'")
   end
end

-- Note: watcher must be a global to continue running
sleep_watcher = cw.new(cleanup_tramp_on_sleep)
sleep_watcher:start()
print("Watching for sleep with ", sleep_watcher)

This helps prevent tramp lockup in emacs by cleaning up all tramp connections prior to sleep. Operating in any remote emacs buffers will automatically re-establish the connection.

For Linux you can do the same using a function which is executed when the DBus suspend signal occurs.
Check out gnus-dbus-sleep-handler for reference.

I this context it should be a little cleaner to write the elisp function in Emacs e.g. in init.el and then call it with emacsclient e.g. as in emacsclient -e my_function. To bad you can't just subscribe to Mach IPC messages as you can with DBus in Emacs.