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Schedule delayed scan when being disconnected from an AP

When being disconnected from an AP, a delayed scan is scheduled to make
sure the AP is still there. wpa_supplicant removes a BSS from its bss list
when it disappears from the scan results twice in a row.

Author: Samuel Ortiz <sameo@linux.intel.com>
Ported by Dongxiao Xu <dongxiao.xu@intel.com>

diff -ruN connman-0.56-orig/plugins/supplicant.c connman-0.56/plugins/supplicant.c
--- connman-0.56-orig/plugins/supplicant.c	2010-09-25 15:08:21.242927383 +0800
+++ connman-0.56/plugins/supplicant.c	2010-09-25 15:12:46.346136858 +0800
@@ -2184,6 +2184,15 @@
 				scanning == TRUE ? "started" : "finished");
 }
 
+static gboolean delayed_scan(gpointer user_data)
+{
+	struct supplicant_task *task = user_data;
+
+	supplicant_scan(task->device);
+
+	return FALSE;
+}
+
 static void state_change(struct supplicant_task *task, DBusMessage *msg)
 {
 	DBusError error;
@@ -2277,7 +2286,13 @@
 				task_connect(task);
 			} else
 				task->network = NULL;
+		} else {
+			if (task->state == WPA_DISCONNECTED)
+				g_timeout_add_seconds(10, delayed_scan, task);
+
+			remove_network(task);
 		}
+
 		break;
 
 	default: