Function continuous_move 

pub async fn continuous_move(
    state: &AppState,
    camera_id: &str,
    pan: f64,
    tilt: f64,
    zoom: f64,
) -> AppResult<()>

Continuously pan/tilt/zoom at the given normalized velocities (each clamped to -1.0..=1.0). The motion runs until stop (or the device’s own timeout).