esp-netif-ppp: support for setting ppp netif up and down

calling esp_netif_up() and esp_netif_down() was not supported if the
underlying netif wos of ppp type. Updated the code to enable setting
these interfaces up/down and registered actions in moden_netif glue for
connection/disconnection events to set the netif up/down.

components/esp_netif/lwip/esp_netif_lwip.c

@@ -51,8 +51,10 @@
 #define ESP_NETIF_HOSTNAME_MAX_SIZE    32
 
 /**
- * @brief lwip thread safe tcpip function utility macro
+ * @brief lwip thread safe tcpip function utility macros
  */
+#define _RUN_IN_LWIP_TASK(function, netif, param) { return esp_netif_lwip_ipc_call(function, netif, (void *)(param)); }
+
 #define _RUN_IN_LWIP_TASK_IF_SUPPORTED(function, netif, param) \
 {                                                              \
     if (netif->is_ppp_netif) {                                 \
@@ -1121,7 +1123,7 @@ static esp_err_t esp_netif_up_api(esp_netif_api_msg_t *msg)
     return ESP_OK;
 }
 
-esp_err_t esp_netif_up(esp_netif_t *esp_netif) _RUN_IN_LWIP_TASK_IF_SUPPORTED(esp_netif_up_api, esp_netif, NULL)
+esp_err_t esp_netif_up(esp_netif_t *esp_netif) _RUN_IN_LWIP_TASK(esp_netif_up_api, esp_netif, NULL)
 
 static esp_err_t esp_netif_down_api(esp_netif_api_msg_t *msg)
 {
@@ -1158,7 +1160,7 @@ static esp_err_t esp_netif_down_api(esp_netif_api_msg_t *msg)
     return ESP_OK;
 }
 
-esp_err_t esp_netif_down(esp_netif_t *esp_netif) _RUN_IN_LWIP_TASK_IF_SUPPORTED(esp_netif_down_api, esp_netif, NULL)
+esp_err_t esp_netif_down(esp_netif_t *esp_netif) _RUN_IN_LWIP_TASK(esp_netif_down_api, esp_netif, NULL)
 
 bool esp_netif_is_netif_up(esp_netif_t *esp_netif)
 {

components/esp_netif/lwip/esp_netif_lwip_ppp.c

@@ -60,6 +60,11 @@ static void on_ppp_status_changed(ppp_pcb *pcb, int err_code, void *ctx)
         case PPPERR_NONE: /* Connected */
             ESP_LOGI(TAG, "Connected");
             if (pcb->if4_up && !ip_addr_isany(&pppif->ip_addr)) {
+                esp_netif_ip_info_t *ip_info = netif->ip_info;
+                ip4_addr_set(&ip_info->ip, ip_2_ip4(&pppif->ip_addr));
+                ip4_addr_set(&ip_info->netmask, ip_2_ip4(&pppif->netmask));
+                ip4_addr_set(&ip_info->gw, ip_2_ip4(&pppif->gw));
+
                 evt.ip_info.ip.addr = pppif->ip_addr.u_addr.ip4.addr;
                 evt.ip_info.gw.addr = pppif->gw.u_addr.ip4.addr;
                 evt.ip_info.netmask.addr = pppif->netmask.u_addr.ip4.addr;

examples/protocols/pppos_client/components/modem/src/esp_modem_netif.c

@@ -146,6 +146,14 @@ esp_err_t esp_modem_netif_set_default_handlers(void *h, esp_netif_t * esp_netif)
     if (ret != ESP_OK) {
         goto set_event_failed;
     }
+    ret = esp_event_handler_register(IP_EVENT, IP_EVENT_PPP_GOT_IP, esp_netif_action_connected, esp_netif);
+    if (ret != ESP_OK) {
+        goto set_event_failed;
+    }
+    ret = esp_event_handler_register(IP_EVENT, IP_EVENT_PPP_LOST_IP, esp_netif_action_disconnected, esp_netif);
+    if (ret != ESP_OK) {
+        goto set_event_failed;
+    }
     return ESP_OK;
 
 set_event_failed: