Inluded frequency selector at start.

src/client.rs

@@ -63,7 +63,7 @@ impl WorkbookClient {
 
     pub async fn start_impedancemeter(
         &self,
-        frequency: f32,
+        frequency: u32,
     ) -> Result<(), WorkbookError<Infallible>> {
         self.client
             .send_resp::<StartImpedanceEndpoint>(&StartImpedance { update_frequency: 60, sinus_frequency: frequency })
@@ -78,4 +78,4 @@ impl WorkbookClient {
             .await?;
         Ok(res)
     }
-}
+}