Added ability to call StartConfigPortal() so that access point name can be unique and automatically generated from the ESP8266 Chip Id.

Tries to reconnect in station mode with  whatever credentials have been saved when StartConfigPortal times out otherwise device will be without WiFi after exiting StartConfigPortal.

Author: kentaylor

WiFiManager.cpp

@@ -149,6 +149,11 @@ boolean WiFiManager::autoConnect(char const *apName, char const *apPassword) {
   return startConfigPortal(apName, apPassword);
 }
 
+boolean  WiFiManager::startConfigPortal() {
+  String ssid = "ESP" + String(ESP.getChipId());
+  return startConfigPortal(ssid.c_str());
+}
+
 boolean  WiFiManager::startConfigPortal(char const *apName, char const *apPassword) {
   //setup AP
   WiFi.mode(WIFI_AP_STA);
@@ -203,7 +208,13 @@ boolean  WiFiManager::startConfigPortal(char const *apName, char const *apPasswo
     }
     yield();
   }
-
+  //Timed out so go back to station mode using system-stored ssid and pass
+   if (connectWifi(WiFi.SSID().c_str(),WiFi.psk().c_str()) != WL_CONNECTED) {
+           DEBUG_WM(F("Failed to connect after configuration mode timeout."));
+         } else {
+           //connected
+           WiFi.mode(WIFI_STA);
+        }
   server.reset();
   dnsServer.reset();
 
@@ -235,7 +246,7 @@ int WiFiManager::connectWifi(String ssid, String pass) {
       ETS_UART_INTR_DISABLE();
       wifi_station_disconnect();
       ETS_UART_INTR_ENABLE();
-        
+
       WiFi.begin();
     } else {
       DEBUG_WM("No saved credentials");

WiFiManager.h

@@ -74,6 +74,7 @@ class WiFiManager
     boolean       autoConnect(char const *apName, char const *apPassword = NULL);
 
     //if you want to always start the config portal, without trying to connect first
+    boolean       startConfigPortal();
     boolean       startConfigPortal(char const *apName, char const *apPassword = NULL);
 
     // get the AP name of the config portal, so it can be used in the callback