Serialport Support

- allow communication to elm327 device via a serialport
- allow creation of elm327 device without requiring unwrap()
- added some extra documentation
- expose reset() functionality of device
- serial_comm and ftdi_comm abstractions added

src/interface.rs

@@ -6,7 +6,6 @@ use super::{device::Obd2BaseDevice, Error, Obd2Device, Result};
 ///
 /// Wraps an implementer of [Obd2BaseDevice] to allow for higher-level usage of the OBD-II
 /// interface.
-#[derive(Default)]
 pub struct Obd2<T: Obd2BaseDevice> {
     device: T,
 }
@@ -17,9 +16,11 @@ impl<T: Obd2BaseDevice> Obd2Device for Obd2<T> {
 
         for response in result.iter() {
             if response.first() != Some(&(0x40 | mode)) {
+                // mismatch of mode in response
                 todo!()
             }
             if response.get(1) != Some(&pid) {
+                // mismatch of PID in response
                 todo!()
             }
         }
@@ -41,6 +42,18 @@ impl<T: Obd2BaseDevice> Obd2Device for Obd2<T> {
 }
 
 impl<T: Obd2BaseDevice> Obd2<T> {
+    /// Creates a new instance of an Obd device
+    pub fn new(dev: T) -> Result<Self> {
+        let device = Obd2 { device: dev };
+
+        Ok(device)
+    }
+
+    /// Resets the device
+    pub fn reset(&mut self) -> Result<()> {
+        Ok(self.device.reset()?)
+    }
+
     fn command(&mut self, command: &[u8]) -> Result<Vec<Vec<u8>>> {
         let response = self
             .device
@@ -109,7 +122,8 @@ impl<T: Obd2BaseDevice> Obd2<T> {
             .filter_map(|l| l.split_once(':'))
             .flat_map(|(idx, data)| {
                 if u8::from_str_radix(idx, 16) != Ok(n_idx) {
-                    todo!()
+                    // got an invalid hex code or values were not already in the correct order
+                    todo!("Line index: {}, should be {:X}", idx, n_idx)
                 }
                 n_idx = (n_idx + 1) % 0x10;
                 data.split_whitespace().map(|s| s.to_owned())