Snapshot.

src/main.rs

@@ -16,11 +16,11 @@ fn get_smeter(comport: &str) -> String {
         .expect("Failed to open port");
 
     // Duh, you need the ";" on the end!
-    // let output = "FA14075000;";
+    // let output = "FA14075000;"; // set VFO A frequency
-    let output = "SM;";
+    //  let output = "FA;"; // ask for VFO A frequency
+    let output = "SM;"; // ask for S-meter reading
     // What are we actually sending?
     //dbg!(output.as_bytes());
-    // port.write(output).expect("Write failed!");
 
     match port.write(output.as_bytes()) {
         Ok(_) => {
@@ -31,7 +31,8 @@ fn get_smeter(comport: &str) -> String {
         Err(e) => eprintln!("{:?}", e),
     }
 
-    // Sleep to allow the device to switch from read to write
+    // Sleep to allow the device to switch from read to write.
+    // Otherwise we can lose some bytes on read.
     sleep(Duration::from_millis(50));
 
     let mut buf = [0u8; 1024];
@@ -41,6 +42,7 @@ fn get_smeter(comport: &str) -> String {
                 let data = String::from_utf8_lossy(&buf[..n]).to_string();
                 //dbg!(data.as_bytes());
                 //let value = data;
+                // For S-meter, just take the numbers
                 let value = &data[2..5];
                 return format!("{}", value);
                 // return;