Cleaning up the api.

Sources/Models/Relay.swift

@@ -1,8 +1,40 @@
 
+/// Represents a relay that can be controlled by the MQTT Broker.
 public struct Relay {
+  
+  /// The topic for the relay.
   public var topic: String
   
+  /// Create a new relay at the given topic.
+  ///
+  /// - Parameters:
+  ///   - topic: The topic for commanding the relay.
   public init(topic: String) {
     self.topic = topic
   }
 }
+
+public enum Relay2 {
+  
+  /// The topic to read the current state of the relay from.
+  case read(topic: String)
+  
+  /// The topic to command the relay state.
+  case command(topic: String)
+}
+
+extension Relay {
+  
+  /// Represents the different commands that can be sent to a relay.
+  public enum State: String {
+    
+    /// Toggle the relay state on or off based on it's current state.
+    case toggle
+    
+    /// Turn the relay off.
+    case off
+    
+    /// Turn the relay on.
+    case on
+  }
+}