https://en.m.wikipedia.org/wiki/Abraham_Niclas_Edelcrantz
Also UK used a system close to that. And a lot of countries along Europe developed their networks with different signaling devices.
https://en.wikipedia.org/wiki/Chappe_telegraph
The stations were more elaborate and there is even a recorded instance of a secret signal being passed on illicitly:
https://blog.franceinfo.fr/deja-vu/2017/10/10/le-piratage-du...
The early history of data networks https://archive.org/details/earlyhistoryofda0000holz
https://terrypratchett.com/explore-discworld/the-modernisati...