add rssi command

src/bin/telesto/main.rs

@@ -32,6 +32,8 @@ enum Commands {
     Echo,
     /// Enter standby.
     Standby,
+    /// Receive signal strength of last received packet.
+    Rssi,
 }
 
 #[tokio::main]
@@ -82,6 +84,16 @@ async fn main() {
             }
         },
         Commands::Standby => radio.standby().await.unwrap(),
+        Commands::Rssi => {
+            let rssi = radio.rssi().await.unwrap();
+
+            if rssi == 0x80 {
+                println!("No RSSI available");
+            } else {
+                let rssi = rssi as i8;
+                println!("RSSI: {}dBm", rssi);
+            }
+        }
         _ => todo!(),
     }
 

src/lib.rs

@@ -141,6 +141,18 @@ where
         }
     }
 
+    /// Gets the receive signal strength (RSSI) of the last packet received.
+    pub async fn rssi(&mut self) -> Result<u8, Error<(), W::Error>> {
+        let mut buf = [0; 224];
+        let size = command(&mut buf, command::Request::Rssi, &[]);
+        self.serial.write(&buf[..size]).await.map_err(Error::Io)?;
+
+        let response = self.poll_response().await;
+        let status = response.data[0];
+
+        Ok(status)
+    }
+
     /// Poll until a response frame is received through the response channel.
     async fn poll_response(&mut self) -> Frame<Response> {
         poll_fn(|cx| {