cpu/esp8266: different conn states in esp_wifi

Different connection states defined to be able to realize a better connect/reconnect handling

cpu/esp8266/esp-wifi/esp_wifi_netdev.c

@@ -197,14 +197,14 @@ static void _esp_wifi_handle_event_cb(System_Event_t *evt)
             ESP_WIFI_LOG_INFO("connected to ssid %s, channel %d",
                               evt->event_info.connected.ssid,
                               evt->event_info.connected.channel);
-            _esp_wifi_dev.connected = true;
+            _esp_wifi_dev.state = ESP_WIFI_CONNECTED;
             break;
 
         case EVENT_STAMODE_DISCONNECTED:
             ESP_WIFI_LOG_INFO("disconnected from ssid %s, reason %d",
                               evt->event_info.disconnected.ssid,
                               evt->event_info.disconnected.reason);
-            _esp_wifi_dev.connected = false;
+            _esp_wifi_dev.state = ESP_WIFI_DISCONNECTED;
 
             /* call disconnect to reset internal state */
             if (!wifi_station_disconnect()) {
@@ -263,7 +263,7 @@ static int _send(netdev_t *netdev, const iolist_t *iolist)
     esp_wifi_netdev_t *dev = (esp_wifi_netdev_t*)netdev;
 
     critical_enter();
-    if (!dev->connected) {
+    if (dev->state != ESP_WIFI_CONNECTED) {
         ESP_WIFI_DEBUG("WiFi is still not connected to AP, cannot send");
         _in_send = false;
         critical_exit();
@@ -459,7 +459,7 @@ static int _get(netdev_t *netdev, netopt_t opt, void *val, size_t max_len)
 
         case NETOPT_LINK_CONNECTED:
             assert(max_len == 1);
-            if (dev->connected) {
+            if (dev->state == ESP_WIFI_CONNECTED) {
                 *((netopt_enable_t *)val) = NETOPT_ENABLE;
             }
             else {
@@ -544,7 +544,7 @@ static void _esp_wifi_setup(void)
 
     /* initialize netdev data structure */
     dev->rx_len = 0;
-    dev->connected = false;
+    dev->state = ESP_WIFI_DISCONNECTED;
 
     mutex_init(&dev->dev_lock);
 

cpu/esp8266/esp-wifi/esp_wifi_netdev.h

@@ -20,12 +20,22 @@
 #define ESP_WIFI_NETDEV_H
 
 #include "net/netdev.h"
-#include "lwip/udp.h"
+#include "ringbuffer.h"
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+/**
+ * @brief   State of the WiFi interface
+ */
+typedef enum {
+    ESP_WIFI_NOT_WORKING,   /**< interface is not working correctly */
+    ESP_WIFI_DISCONNECTED,  /**< interface is not associated to the AP */
+    ESP_WIFI_CONNECTING,    /**< interface is trying an association to the AP */
+    ESP_WIFI_CONNECTED      /**< interface is not associated to the AP */
+} esp_wifi_state_t;
+
 /**
  * @brief   Device descriptor for ESP infrastructure mode WIFI device
  */
@@ -34,15 +44,14 @@ typedef struct
     netdev_t netdev;                  /**< netdev parent struct */
 
     uint8_t mac[ETHERNET_ADDR_LEN];   /**< MAC address of the device */
-    ip_addr_t ip;                     /**< IPv4 address of the device */
 
     uint8_t rx_buf[ETHERNET_MAX_LEN]; /**< receive buffer */
     uint16_t rx_len;                  /**< number of bytes received from lwIP */
 
-    bool connected;   /**< indicates the connection state to the AP */
-
-    mutex_t dev_lock; /**< for exclusive access to buffer in receive functions */
+    esp_wifi_state_t state;           /**< indicates the interface state */
 
+    mutex_t dev_lock;                 /**< for exclusive access to buffer in
+                                           receive functions */
 } esp_wifi_netdev_t;
 
 #ifdef __cplusplus