Add documentation PDFs

README.md

@@ -25,10 +25,17 @@ fn main() {
     let mut txvr = Rn2903::new_at("/dev/ttyUSB0")
         .expect("Could not open device. Error");
     loop {
-        txvr.transact(b"radio set pindig GPIO10 0").unwrap();
+        txvr.transact(b"sys set pindig GPIO10 0").unwrap();
         thread::sleep(Duration::from_millis(1000));
-        txvr.transact(b"radio set pindig GPIO10 1").unwrap();
+        txvr.transact(b"sys set pindig GPIO10 1").unwrap();
         thread::sleep(Duration::from_millis(1000));
     }
 }
 ```
+
+## Module Documentation
+
+This repository reproduces the relevant documents for the RN2903 module at
+[command_reference-40001811B.pdf](docu/command_reference-40001811B.pdf) and
+[datasheet-DS5000239H.pdf](docu/datasheet-DS5000239H.pdf).
+

src/lib.rs

@@ -224,7 +224,6 @@ impl Rn2903 {
     ///
     /// Using [`::transact()`](#method.transact) is preferred.
     pub fn send_line(&mut self, line: &[u8]) -> Result<()> {
-        use std::io::IoSlice;
         let bytes: Vec<u8> = line.iter().chain(b"\x0D\x0A".iter()).cloned().collect();
         let mut cursor = 0;
         while cursor < bytes.len() {