std::functioanl for WFIF event + Minor fix (#1366)

* add missing bits from esp8266 to help porting other libs

* Clean Up of Wifi event

* Exampl of Wifi Events

cores/esp32/pgmspace.h

@@ -71,7 +71,7 @@ typedef unsigned long prog_uint32_t;
 #define memcpy_P      memcpy
 #define strcpy_P      strcpy
 #define strncpy_P     strncpy
-#define strcat_p      strcat
+#define strcat_P      strcat
 #define strncat_P     strncat
 #define strcmp_P      strcmp
 #define strncmp_P     strncmp

libraries/WiFi/examples/WiFiClientEvents/WiFiClientEvents.ino

@@ -1,7 +1,37 @@
 /*
  *  This sketch shows the WiFi event usage
  *
- */
+*/
+
+/* 
+* WiFi Events
+
+SYSTEM_EVENT_WIFI_READY               < ESP32 WiFi ready
+SYSTEM_EVENT_SCAN_DONE                < ESP32 finish scanning AP
+SYSTEM_EVENT_STA_START                < ESP32 station start
+SYSTEM_EVENT_STA_STOP                 < ESP32 station stop
+SYSTEM_EVENT_STA_CONNECTED            < ESP32 station connected to AP
+SYSTEM_EVENT_STA_DISCONNECTED         < ESP32 station disconnected from AP
+SYSTEM_EVENT_STA_AUTHMODE_CHANGE      < the auth mode of AP connected by ESP32 station changed
+SYSTEM_EVENT_STA_GOT_IP               < ESP32 station got IP from connected AP
+SYSTEM_EVENT_STA_LOST_IP              < ESP32 station lost IP and the IP is reset to 0
+SYSTEM_EVENT_STA_WPS_ER_SUCCESS       < ESP32 station wps succeeds in enrollee mode
+SYSTEM_EVENT_STA_WPS_ER_FAILED        < ESP32 station wps fails in enrollee mode
+SYSTEM_EVENT_STA_WPS_ER_TIMEOUT       < ESP32 station wps timeout in enrollee mode
+SYSTEM_EVENT_STA_WPS_ER_PIN           < ESP32 station wps pin code in enrollee mode
+SYSTEM_EVENT_AP_START                 < ESP32 soft-AP start
+SYSTEM_EVENT_AP_STOP                  < ESP32 soft-AP stop
+SYSTEM_EVENT_AP_STACONNECTED          < a station connected to ESP32 soft-AP
+SYSTEM_EVENT_AP_STADISCONNECTED       < a station disconnected from ESP32 soft-AP
+SYSTEM_EVENT_AP_PROBEREQRECVED        < Receive probe request packet in soft-AP interface
+SYSTEM_EVENT_GOT_IP6                  < ESP32 station or ap or ethernet interface v6IP addr is preferred
+SYSTEM_EVENT_ETH_START                < ESP32 ethernet start
+SYSTEM_EVENT_ETH_STOP                 < ESP32 ethernet stop
+SYSTEM_EVENT_ETH_CONNECTED            < ESP32 ethernet phy link up
+SYSTEM_EVENT_ETH_DISCONNECTED         < ESP32 ethernet phy link down
+SYSTEM_EVENT_ETH_GOT_IP               < ESP32 ethernet got IP from connected AP
+SYSTEM_EVENT_MAX
+*/
 
 #include <WiFi.h>
 
@@ -13,7 +43,8 @@ void WiFiEvent(WiFiEvent_t event)
 {
     Serial.printf("[WiFi-event] event: %d\n", event);
 
-    switch(event) {
+    switch (event)
+    {
     case SYSTEM_EVENT_STA_GOT_IP:
         Serial.println("WiFi connected");
         Serial.println("IP address: ");
@@ -25,6 +56,13 @@ void WiFiEvent(WiFiEvent_t event)
     }
 }
 
+void WiFiGotIP(WiFiEvent_t event, WiFiEventInfo_t info)
+{
+    Serial.println("WiFi connected");
+    Serial.println("IP address: ");
+    Serial.println(IPAddress(info.got_ip.ip_info.ip.addr));
+}
+
 void setup()
 {
     Serial.begin(115200);
@@ -34,7 +72,18 @@ void setup()
 
     delay(1000);
 
+    // Examples of diffrent ways to register wifi events
     WiFi.onEvent(WiFiEvent);
+    WiFi.onEvent(WiFiGotIP, WiFiEvent_t::SYSTEM_EVENT_STA_GOT_IP);
+    WiFiEventId_t eventID = WiFi.onEvent([](WiFiEvent_t event, WiFiEventInfo_t info){
+        Serial.print("WiFi lost connection. Reason: ");
+        Serial.println(info.disconnected.reason);
+    }, WiFiEvent_t::SYSTEM_EVENT_STA_DISCONNECTED);
+
+    // Remove WiFi event
+    Serial.print("WiFi Event ID: ");
+    Serial.println(eventID);
+    // WiFi.removeEvent(eventID);
 
     WiFi.begin(ssid, password);
 
@@ -43,9 +92,7 @@ void setup()
     Serial.println("Wait for WiFi... ");
 }
 
-
 void loop()
 {
     delay(1000);
 }
-

libraries/WiFi/src/WiFiGeneric.cpp

@@ -170,12 +170,18 @@ static bool espWiFiStop(){
 // ------------------------------------------------- Generic WiFi function -----------------------------------------------
 // -----------------------------------------------------------------------------------------------------------------------
 
-typedef struct {
+typedef struct WiFiEventCbList {
+    static wifi_event_id_t current_id;
+    wifi_event_id_t id;
     WiFiEventCb cb;
-    WiFiEventFullCb fcb;
+    WiFiEventFuncCb fcb;
     WiFiEventSysCb scb;
     system_event_id_t event;
+
+    WiFiEventCbList() : id(current_id++) {}
 } WiFiEventCbList_t;
+wifi_event_id_t WiFiEventCbList::current_id = 1;
+
 
 // arduino dont like std::vectors move static here
 static std::vector<WiFiEventCbList_t> cbEventList;
@@ -193,10 +199,10 @@ WiFiGenericClass::WiFiGenericClass()
  * @param cbEvent WiFiEventCb
  * @param event optional filter (WIFI_EVENT_MAX is all events)
  */
-void WiFiGenericClass::onEvent(WiFiEventCb cbEvent, system_event_id_t event)
+wifi_event_id_t WiFiGenericClass::onEvent(WiFiEventCb cbEvent, system_event_id_t event)
 {
     if(!cbEvent) {
-        return;
+        return 0;
     }
     WiFiEventCbList_t newEventHandler;
     newEventHandler.cb = cbEvent;
@@ -204,12 +210,13 @@ void WiFiGenericClass::onEvent(WiFiEventCb cbEvent, system_event_id_t event)
     newEventHandler.scb = NULL;
     newEventHandler.event = event;
     cbEventList.push_back(newEventHandler);
+    return newEventHandler.id;
 }
 
-void WiFiGenericClass::onEvent(WiFiEventFullCb cbEvent, system_event_id_t event)
+wifi_event_id_t WiFiGenericClass::onEvent(WiFiEventFuncCb cbEvent, system_event_id_t event)
 {
     if(!cbEvent) {
-        return;
+        return 0;
     }
     WiFiEventCbList_t newEventHandler;
     newEventHandler.cb = NULL;
@@ -217,12 +224,13 @@ void WiFiGenericClass::onEvent(WiFiEventFullCb cbEvent, system_event_id_t event)
     newEventHandler.scb = NULL;
     newEventHandler.event = event;
     cbEventList.push_back(newEventHandler);
+    return newEventHandler.id;
 }
 
-void WiFiGenericClass::onEvent(WiFiEventSysCb cbEvent, system_event_id_t event)
+wifi_event_id_t WiFiGenericClass::onEvent(WiFiEventSysCb cbEvent, system_event_id_t event)
 {
     if(!cbEvent) {
-        return;
+        return 0;
     }
     WiFiEventCbList_t newEventHandler;
     newEventHandler.cb = NULL;
@@ -230,6 +238,7 @@ void WiFiGenericClass::onEvent(WiFiEventSysCb cbEvent, system_event_id_t event)
     newEventHandler.scb = cbEvent;
     newEventHandler.event = event;
     cbEventList.push_back(newEventHandler);
+    return newEventHandler.id;
 }
 
 /**
@@ -251,20 +260,6 @@ void WiFiGenericClass::removeEvent(WiFiEventCb cbEvent, system_event_id_t event)
     }
 }
 
-void WiFiGenericClass::removeEvent(WiFiEventFullCb cbEvent, system_event_id_t event)
-{
-    if(!cbEvent) {
-        return;
-    }
-
-    for(uint32_t i = 0; i < cbEventList.size(); i++) {
-        WiFiEventCbList_t entry = cbEventList[i];
-        if(entry.fcb == cbEvent && entry.event == event) {
-            cbEventList.erase(cbEventList.begin() + i);
-        }
-    }
-}
-
 void WiFiGenericClass::removeEvent(WiFiEventSysCb cbEvent, system_event_id_t event)
 {
     if(!cbEvent) {
@@ -279,6 +274,16 @@ void WiFiGenericClass::removeEvent(WiFiEventSysCb cbEvent, system_event_id_t eve
     }
 }
 
+void WiFiGenericClass::removeEvent(wifi_event_id_t id)
+{
+    for(uint32_t i = 0; i < cbEventList.size(); i++) {
+        WiFiEventCbList_t entry = cbEventList[i];
+        if(entry.id == id) {
+            cbEventList.erase(cbEventList.begin() + i);
+        }
+    }
+}
+
 /**
  * callback for WiFi events
  * @param arg
@@ -329,9 +334,9 @@ esp_err_t WiFiGenericClass::_eventCallback(void *arg, system_event_t *event)
         WiFiEventCbList_t entry = cbEventList[i];
         if(entry.cb || entry.fcb || entry.scb) {
             if(entry.event == (system_event_id_t) event->event_id || entry.event == SYSTEM_EVENT_MAX) {
-                if(entry.cb){
+                if(entry.cb) {
                     entry.cb((system_event_id_t) event->event_id);
-                } else if(entry.fcb){
+                } else if(entry.fcb) {
                     entry.fcb((system_event_id_t) event->event_id, (system_event_info_t) event->event_info);
                 } else {
                     entry.scb(event);

libraries/WiFi/src/WiFiGeneric.h

@@ -23,26 +23,28 @@
 #ifndef ESP32WIFIGENERIC_H_
 #define ESP32WIFIGENERIC_H_
 
-#include "WiFiType.h"
 #include <esp_err.h>
 #include <esp_event_loop.h>
+#include <functional>
+#include "WiFiType.h"
 
 typedef void (*WiFiEventCb)(system_event_id_t event);
-typedef void (*WiFiEventFullCb)(system_event_id_t event, system_event_info_t info);
+typedef std::function<void(system_event_id_t event, system_event_info_t info)> WiFiEventFuncCb;
 typedef void (*WiFiEventSysCb)(system_event_t *event);
 
+typedef size_t wifi_event_id_t;
+
 class WiFiGenericClass
 {
-public:
+  public:
-
     WiFiGenericClass();
 
-    void onEvent(WiFiEventCb cbEvent, system_event_id_t event = SYSTEM_EVENT_MAX);
+    wifi_event_id_t onEvent(WiFiEventCb cbEvent, system_event_id_t event = SYSTEM_EVENT_MAX);
-    void onEvent(WiFiEventFullCb cbEvent, system_event_id_t event = SYSTEM_EVENT_MAX);
+    wifi_event_id_t onEvent(WiFiEventFuncCb cbEvent, system_event_id_t event = SYSTEM_EVENT_MAX);
-    void onEvent(WiFiEventSysCb cbEvent, system_event_id_t event = SYSTEM_EVENT_MAX);
+    wifi_event_id_t onEvent(WiFiEventSysCb cbEvent, system_event_id_t event = SYSTEM_EVENT_MAX);
     void removeEvent(WiFiEventCb cbEvent, system_event_id_t event = SYSTEM_EVENT_MAX);
-    void removeEvent(WiFiEventFullCb cbEvent, system_event_id_t event = SYSTEM_EVENT_MAX);
     void removeEvent(WiFiEventSysCb cbEvent, system_event_id_t event = SYSTEM_EVENT_MAX);
+    void removeEvent(wifi_event_id_t id);
 
     int32_t channel(void);
 
@@ -56,16 +58,14 @@ public:
 
     static esp_err_t _eventCallback(void *arg, system_event_t *event);
 
-protected:
+  protected:
     static bool _persistent;
     static wifi_mode_t _forceSleepLastMode;
 
-public:
+  public:
-
+    int hostByName(const char *aHostname, IPAddress &aResult);
-    int hostByName(const char* aHostname, IPAddress& aResult);
-
-protected:
 
+  protected:
     friend class WiFiSTAClass;
     friend class WiFiScanClass;
     friend class WiFiAPClass;

libraries/WiFi/src/WiFiType.h

@@ -33,6 +33,9 @@
 #define WIFI_AP_STA  WIFI_MODE_APSTA
 
 #define WiFiEvent_t  system_event_id_t
+#define WiFiEventInfo_t system_event_info_t
+#define WiFiEventId_t wifi_event_id_t
+
 
 typedef enum {
     WL_NO_SHIELD        = 255,   // for compatibility with WiFi Shield library