implemented endless reconnecting to an already connected WiFi

ADIS_ESP32_Eclipse/main/wifi.c

@@ -68,6 +68,7 @@ static EventGroupHandle_t s_wifi_event_group;
 #define WIFI_EVENT_HANDLER_CONNECTED_BIT (1<<0)
 #define WIFI_EVENT_HANDLER_FAIL_BIT      (1<<1)
 #define WIFI_CONNECTED_BIT               (1<<2)
+#define WIFI_WAS_CONNECTED_ONCE          (1<<3) // enables retry when the WiFi was lost
 
 static esp_netif_t *APP_WiFi_NetIf;
 static bool APP_WiFi_isOn = true;
@@ -88,20 +89,35 @@ static void event_handler(void* arg, esp_event_base_t event_base, int32_t event_
     McuLog_info("WIFI_EVENT_STA_START: start event");
     esp_wifi_connect();
   } else if (event_base == WIFI_EVENT && event_id == WIFI_EVENT_STA_DISCONNECTED) {
-    McuLog_info("WIFI_EVENT_STA_DISCONNECTED: disconnected, retry %d", s_retry_num);
+    McuLog_info("WIFI_EVENT_STA_DISCONNECTED: disconnected");
+    // set bit for WiFiTask => state is disconnected
+    xEventGroupClearBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
+    // any retrys left?
     if (s_retry_num < CONFIG_ESP_MAXIMUM_RETRY) {
       esp_wifi_connect();
-      s_retry_num++;
-      McuLog_info("retry to connect to the AP");
-    } else {
+      McuLog_info("retrying to connect to the AP, retry %d", ++s_retry_num);
+    }  // if wifi already connected => endless reconnect, no counting
+    else if(xEventGroupGetBits(s_wifi_event_group)&WIFI_WAS_CONNECTED_ONCE){
+      esp_wifi_connect();
+      McuLog_info("retrying endlessly to connect to the AP");
+    }
+    else {
+      // set bits for init
       xEventGroupSetBits(s_wifi_event_group, WIFI_EVENT_HANDLER_FAIL_BIT);
+      xEventGroupClearBits(s_wifi_event_group, WIFI_EVENT_HANDLER_CONNECTED_BIT);
     }
     McuLog_info("connect to the AP fail");
   } else if (event_base == IP_EVENT && event_id == IP_EVENT_STA_GOT_IP) {
     ip_event_got_ip_t* event = (ip_event_got_ip_t*) event_data;
     McuLog_info("IP_EVENT_STA_GOT_IP: got ip:" IPSTR, IP2STR(&event->ip_info.ip));
     s_retry_num = 0;
+    // set bits for init
     xEventGroupSetBits(s_wifi_event_group, WIFI_EVENT_HANDLER_CONNECTED_BIT);
+    xEventGroupClearBits(s_wifi_event_group, WIFI_EVENT_HANDLER_FAIL_BIT);
+    // set bit for WiFiTask => state is connected
+    xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
+    // set wifi was connected once => enables endless reconnect from here
+    xEventGroupSetBits(s_wifi_event_group, WIFI_WAS_CONNECTED_ONCE);
   }
 }
 
@@ -219,7 +235,6 @@ static void initialise_wifi(void) {
     } else if (mode == WIFI_PASSWORD_METHOD_PSK) {
       McuLog_info("connected to AP SSID: %s",  CONFIG_WIFI_PSK_SSID);
     }
-    xEventGroupSetBits(s_wifi_event_group, WIFI_CONNECTED_BIT);
   } else if (bits & WIFI_EVENT_HANDLER_FAIL_BIT) {
     if (mode == WIFI_PASSWORD_METHOD_WPA2) {
       McuLog_info("Failed to connect to SSID: %s", CONFIG_WIFI_EAP_SSID);