remove print statement

src/radio.rs

@@ -30,9 +30,9 @@ impl UartRadio {
 
         // wait until we have space for packets
         while buf != [0x02] {
-            println!("full buf! sleeping...");
             sleep(Duration::from_millis(10));
 
+            // poll to see if the buffer has emptied yet
             self.uart.write_all(&[0x00])?;
             self.uart.flush()?;