WiFi: add SSID() and RSSI()

Author: pennam

libraries/SocketWrapper/WiFi.h

@@ -79,21 +79,19 @@ class WiFiClass : public NetworkInterface {
 		return true;
 	}
 
-	int status() {
-		struct wifi_iface_status status = {0};
-
-		if (net_mgmt(NET_REQUEST_WIFI_IFACE_STATUS, netif, &status,
-					 sizeof(struct wifi_iface_status))) {
-			return WL_NO_SHIELD;
-		}
+    int status() {
+        if (net_mgmt(NET_REQUEST_WIFI_IFACE_STATUS, netif, &sta_state,
+                sizeof(struct wifi_iface_status))) {
+            return WL_NO_SHIELD;
+        }
 
-		if (status.state >= WIFI_STATE_ASSOCIATED) {
-			return WL_CONNECTED;
-		} else {
-			return WL_DISCONNECTED;
-		}
-		return WL_NO_SHIELD;
-	}
+	    if (sta_state.state >= WIFI_STATE_ASSOCIATED) {
+            return WL_CONNECTED;
+        } else {
+            return WL_DISCONNECTED;
+        }
+        return WL_NO_SHIELD;
+    }
 
 	int8_t scanNetworks() {
 		// TODO: borrow code from mbed core for scan results handling