Continue redesign for the v1 stable release (#5)

Reviewed-on: #5

crates/device/src/device.rs

@@ -9,6 +9,20 @@ pub enum DeviceState {
     Set,
 }
 
+impl DeviceState {
+    pub fn initial(&self) -> bool {
+        matches!(self, DeviceState::Initial)
+    }
+
+    pub fn requesting(&self) -> bool {
+        matches!(self, DeviceState::Requesting)
+    }
+
+    pub fn set(&self) -> bool {
+        matches!(self, DeviceState::Set)
+    }
+}
+
 /// Announcement
 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct Announcement {