Add units, change topic name.

src/bin/main_gui.rs

@@ -29,6 +29,7 @@ fn main() {
     let magnitude_series_clone = app.magnitude_series.clone();
     let phase_series_clone = app.phase_series.clone();
     let connected_clone = app.connected.clone();
+
     let data_frequency_clone = app.data_frequency.clone();
 
     // Execute the runtime in its own thread.