add an argument for disconnect event which carrier reason

Source/Meadow.Contracts/Hardware/Networking/INetworkAdapter.cs

@@ -14,7 +14,8 @@ namespace Meadow.Hardware;
 /// Delegate containing information about a network disconnection event
 /// </summary>
 /// <param name="sender"></param>
-public delegate void NetworkDisconnectionHandler(INetworkAdapter sender);
+/// <param name="args"></param>
+public delegate void NetworkDisconnectionHandler(INetworkAdapter sender, NetworkDisconnectionEventArgs args);
 
 /// <summary>
 /// Delegate containing information about a network error event.

Source/Meadow.Contracts/Hardware/Networking/NetworkDisconnectionEventArgs.cs

@@ -0,0 +1,28 @@
+using System;
+
+namespace Meadow.Hardware;
+
+/// <summary>
+/// Data relating to a WiFi disconnect event.
+/// </summary>
+public class NetworkDisconnectionEventArgs : EventArgs
+{
+    /// <summary>
+    /// Date and time the event was generated.
+    /// </summary>
+    public DateTime When { get; private set; }
+
+    /// <summary>
+    /// Disconnect reason
+    /// </summary>
+    public string Reason { get; }
+
+    /// <summary>
+    /// Construct a NetworkDisconnectionEventArgs object.
+    /// </summary>
+    public NetworkDisconnectionEventArgs(string reson)
+    {
+        When = DateTime.UtcNow;
+        Reason = reson;
+    }
+}