by preindustrial standards texting on a cell phone basically already does this, and by prehistoric standards writing does 🤔 though I get that's not what you mean, telepathic is definitely nebulous here: if it's technology-assisted, at what point on the continuum of written text to personal device to permanent cyborg qualifies? conversely, a strict definition might say telepathy wouldn't qualify if it's technologically assisted at all

Let's say someone made a device that can send a mild pain sign to you when you're girlfriend is distressed. Would that count?