A light tower based communication system

I'm building a world with cities of extremely different technological capabilities. One has a monopoly on gunpowder and one has complete understanding of the magic system in the world.

The only thing missing is fast communication without the use of radio waves, so I thought a network of light towers using something similar to morse code could be used. I'm asking if this would be feasible and how would I keep this form of communication discrete from enemies.

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A light tower based communication system

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