Does someone here know which escape sequence to send for C-M-SPC?

in a terminal, iTerm2 to be specific

Thank god, someone wrote a blog post again: https://lepovirta.org/posts/2013-01-19-ctrl-meta-space-in-iterm2.html

Started using libvterm with emacs, finally a decent terminal emulator

Any pointers how to get started on that?

I might settle on X-forwarding in the end

Tried several things now: editing in RDP via X-forwarded emacs, tramp, ssh terminal and now X-forwarding to my local machine. I think the last one gives the best experience so far.

Although I had to fix the meta key