add more debug for disconnect

add isConnected function for easier usage

Author: Links2004

libraries/ESP8266WiFi/src/ESP8266WiFiGeneric.cpp

@@ -106,6 +106,7 @@ void ESP8266WiFiGenericClass::_eventCallback(void* arg) {
     DEBUGV("wifi evt: %d\n", event->event);
 
     if(event->event == EVENT_STAMODE_DISCONNECTED) {
+        DEBUGV("STA disconnect: %d\n", event->event_info.disconnected.reason);
         WiFiClient::stopAll();
     }
 

libraries/ESP8266WiFi/src/ESP8266WiFiSTA.cpp

@@ -267,6 +267,15 @@ bool ESP8266WiFiSTAClass::disconnect(bool wifioff) {
     return ret;
 }
 
+/**
+ * is STA interface connected?
+ * @return true if STA is connected to an AD
+ */
+bool ESP8266WiFiSTAClass::isConnected() {
+    return (status() == WL_CONNECTED);
+}
+
+
 /**
  * Setting the ESP8266 station to connect to the AP (which is recorded)
  * automatically or not when powered on. Enable auto-connect by default.

libraries/ESP8266WiFi/src/ESP8266WiFiSTA.h

@@ -44,6 +44,8 @@ class ESP8266WiFiSTAClass {
         bool reconnect();
         bool disconnect(bool wifioff = false);
 
+        bool isConnected();
+
         bool setAutoConnect(bool autoConnect);
         bool getAutoConnect();