Added Network trait that keeps track of network settings and has DHCP/Manual options for setting up options

src/network/dhcp.rs

@@ -0,0 +1,29 @@
+use crate::bus::ActiveBus;
+use crate::network::{Network,NetworkSettings};
+use crate::MacAddress;
+
+pub struct Dhcp {
+    settings: NetworkSettings,
+    current: NetworkSettings,
+}
+
+impl Dhcp {
+    pub fn new(mac: MacAddress) -> Self {
+        let settings = NetworkSettings {
+            mac,
+            ..NetworkSettings::default()
+        };
+        Self {
+            settings,
+            current: NetworkSettings::default(),
+        }
+    }
+}
+
+impl Network for Dhcp {
+    /// Gets (if necessary) and sets the network settings on the chip
+    fn refresh<SpiBus: ActiveBus>(&mut self, _bus: &mut SpiBus) -> Result<(), SpiBus::Error> {
+        // TODO actually negotiate settings from DHCP
+        Ok(())
+    }
+}