fixes #924 wifi info getters

gets ssid and psk with persistent param, needs testing

WiFiManager.cpp

@@ -2362,9 +2362,29 @@ void WiFiManager::setCountry(String cc){
 void WiFiManager::setClass(String str){
   _bodyClass = str;
 }
-  
+
 // HELPERS
 
+/**
+ * getWiFiSSID
+ * @since $dev
+ * @param bool persistent
+ * @return String
+ */
+String WiFiManager::getWiFiSSID(bool persistent){
+  return WiFi_SSID(persistent);
+}
+
+/**
+ * getWiFiPass
+ * @since $dev
+ * @param bool persistent
+ * @return String
+ */
+String WiFiManager::getWiFiPass(bool persistent){
+  return WiFi_psk(persistent);
+} 
+
 // DEBUG
 // @todo fix DEBUG_WM(0,0);
 template <typename Generic>
@@ -2665,15 +2685,58 @@ bool WiFiManager::WiFi_hasAutoConnect(){
   return WiFi_SSID() != "";
 }
 
-String WiFiManager::WiFi_SSID(){
-  #ifdef ESP8266
-    return WiFi.SSID();
-  #elif defined(ESP32)
-    //@todo , workaround only when not connected
+String WiFiManager::WiFi_SSID(bool persistent) const{
+
+    #ifdef ESP8266
+    struct station_config conf;
+    if(persistent) wifi_station_get_config_default(&conf);
+    else wifi_station_get_config(&conf);
+
+    char tmp[33]; //ssid can be up to 32chars, => plus null term
+    memcpy(tmp, conf.ssid, sizeof(conf.ssid));
+    tmp[32] = 0; //nullterm in case of 32 char ssid
+    return String(reinterpret_cast<char*>(tmp));
+    
+    #elif defined(ESP32)
+    if(persistent){
+      wifi_config_t conf;
+      esp_wifi_get_config(WIFI_IF_STA, &conf);
+      return String(reinterpret_cast<const char*>(conf.sta.ssid));
+    }
+    else {
+      if(WiFiGenericClass::getMode() == WIFI_MODE_NULL){
+          return String();
+      }
+      wifi_ap_record_t info;
+      if(!esp_wifi_sta_get_ap_info(&info)) {
+          return String(reinterpret_cast<char*>(info.ssid));
+      }
+      return String();
+    }
+    #endif
+}
+
+String WiFiManager::WiFi_psk(bool persistent) const {
+    #ifdef ESP8266
+    struct station_config conf;
+
+    if(persistent) wifi_station_get_config_default(&conf);
+    else wifi_station_get_config(&conf);
+
+    char tmp[65]; //psk is 64 bytes hex => plus null term
+    memcpy(tmp, conf.password, sizeof(conf.password));
+    tmp[64] = 0; //null term in case of 64 byte psk
+    return String(reinterpret_cast<char*>(tmp));
+    
+    #elif defined(ESP32)
+    // only if wifi is init
+        if(WiFiGenericClass::getMode() == WIFI_MODE_NULL){
+        return String();
+    }
     wifi_config_t conf;
     esp_wifi_get_config(WIFI_IF_STA, &conf);
-    return String(reinterpret_cast<const char*>(conf.sta.ssid));
-  #endif
+    return String(reinterpret_cast<char*>(conf.sta.password));
+    #endif
 }
 
 #ifdef ESP32

WiFiManager.h

@@ -269,6 +269,11 @@ class WiFiManager
     // check if the module has a saved ap to connect to
     bool          getWiFiIsSaved();
 
+    // helper to get saved ssid, if persistent get stored, else get current if connected
+    String        getWiFiPass(bool persistent = false);
+    // helper to get saved password, if persistent get stored, else get current if connected
+    String        getWiFiSSID(bool persistent = false);
+
     // debug output the softap config
     void          debugSoftAPConfig();
     // debug output platform info and versioning
@@ -422,7 +427,8 @@ class WiFiManager
     uint8_t       WiFi_softap_num_stations();
     bool          WiFi_hasAutoConnect();
     void          WiFi_autoReconnect();
-    String        WiFi_SSID();
+    String        WiFi_SSID(bool persistent = false) const;
+    String        WiFi_psk(bool persistent = false) const;
     bool          WiFi_scanNetworks();
     bool          WiFi_scanNetworks(bool force,bool async);
     bool          WiFi_scanNetworks(unsigned int cachetime,bool async);