Add overloads to support __FlashStringHelper like ESP8266 has them. (#8111)

Co-authored-by: Me No Dev <me-no-dev@users.noreply.github.com>

cores/esp32/WString.h

@@ -34,7 +34,7 @@
 // A pure abstract class forward used as a means to proide a unique pointer type
 // but really is never defined.
 class __FlashStringHelper;
-#define FPSTR(pstr_pointer) (reinterpret_cast<const __FlashStringHelper *>(pstr_pointer))
+#define FPSTR(str_pointer) (reinterpret_cast<const __FlashStringHelper *>(str_pointer))
 #define F(string_literal) (FPSTR(PSTR(string_literal)))
 
 // An inherited class for holding the result of a concatenation.  These

libraries/ESPmDNS/src/ESPmDNS.cpp

@@ -60,7 +60,7 @@ MDNSResponder::~MDNSResponder() {
     end();
 }
 
-bool MDNSResponder::begin(const char* hostName){
+bool MDNSResponder::begin(const String& hostName){
     if(mdns_init()){
         log_e("Failed starting MDNS");
         return false;
@@ -68,7 +68,7 @@ bool MDNSResponder::begin(const char* hostName){
     //WiFi.onEvent(_on_sys_event);
     _hostname = hostName;
 	_hostname.toLowerCase();
-    if(mdns_hostname_set(hostName)) {
+    if(mdns_hostname_set(hostName.c_str())) {
         log_e("Failed setting MDNS hostname");
         return false;
     }

libraries/ESPmDNS/src/ESPmDNS.h

@@ -54,7 +54,10 @@ class MDNSResponder {
 public:
   MDNSResponder();
   ~MDNSResponder();
-  bool begin(const char* hostName);
+  bool begin(const String& hostName);
+  bool begin(const char* hostName){
+    return begin(String(hostName));
+  }
   void end();
 
   void setInstanceName(String name);

libraries/WiFi/src/WiFiSTA.h

@@ -45,7 +45,13 @@ class WiFiSTAClass
 public:
 
     wl_status_t begin(const char* wpa2_ssid, wpa2_auth_method_t method, const char* wpa2_identity=NULL, const char* wpa2_username=NULL, const char *wpa2_password=NULL, const char* ca_pem=NULL, const char* client_crt=NULL, const char* client_key=NULL, int32_t channel=0, const uint8_t* bssid=0, bool connect=true);
+    wl_status_t begin(const String& wpa2_ssid, wpa2_auth_method_t method, const String& wpa2_identity = (const char*)NULL, const String& wpa2_username = (const char*)NULL, const String& wpa2_password = (const char*)NULL, const String& ca_pem = (const char*)NULL, const String& client_crt = (const char*)NULL, const String& client_key = (const char*)NULL, int32_t channel=0, const uint8_t* bssid=0, bool connect=true) {
+        return begin(wpa2_ssid.c_str(), method, wpa2_identity.c_str(), wpa2_username.c_str(), wpa2_password.c_str(), ca_pem.c_str(), client_crt.c_str(), client_key.c_str(), channel, bssid, connect);
+    }
     wl_status_t begin(const char* ssid, const char *passphrase = NULL, int32_t channel = 0, const uint8_t* bssid = NULL, bool connect = true);
+    wl_status_t begin(const String& ssid, const String& passphrase = (const char*)NULL, int32_t channel = 0, const uint8_t* bssid = NULL, bool connect = true) {
+        return begin(ssid.c_str(), passphrase.c_str(), channel, bssid, connect);
+    }
     wl_status_t begin(char* ssid, char *passphrase = NULL, int32_t channel = 0, const uint8_t* bssid = NULL, bool connect = true);
     wl_status_t begin();