fixed closing and opening of udp port

src/asyncudplistener.cpp

@@ -158,20 +158,21 @@ bool AsyncUdpListener::listen(const ip_addr_t *addr, uint16_t port)
         }
     }
 
+    close();
+
     if (!_init())
     {
         ESP_LOGE(TAG, "failed to init");
         return false;
     }
 
-    close();
-
     if (addr)
     {
         IP_SET_TYPE_VAL(_pcb->local_ip,  addr->type);
         IP_SET_TYPE_VAL(_pcb->remote_ip, addr->type);
     }
 
+    ESP_LOGI(TAG, "calling udp_bind()...");
     if (_udp_bind(_pcb, addr, port) != ERR_OK)
     {
         ESP_LOGE(TAG, "failed to bind");
@@ -262,30 +263,38 @@ void AsyncUdpListener::_udp_task_post(udp_pcb *_pcb, pbuf *pb, const ip_addr_t *
     }
 }
 
-bool AsyncUdpListener::_init()
+void AsyncUdpListener::close()
 {
-    if (_pcb)
-        return true;
-
-    _pcb = udp_new();
-    if (!_pcb)
+    if (_connected)
     {
-        ESP_LOGE(TAG, "udp_new() failed");
-        return false;
+        ESP_LOGI(TAG, "calling udp_diconnect()...");
+        _udp_disconnect(_pcb);
+        _connected = false;
     }
 
-    udp_recv(_pcb, &_udp_recv, (void *)this);
+    if (_pcb)
+    {
+        ESP_LOGI(TAG, "calling udp_remove()...");
+        udp_remove(_pcb);
+        _pcb = nullptr;
+    }
+}
+
+bool AsyncUdpListener::_init()
+{
+    if (!_pcb)
+    {
+        ESP_LOGI(TAG, "calling udp_new()...");
+        _pcb = udp_new();
+        if (!_pcb)
+        {
+            ESP_LOGE(TAG, "udp_new() failed");
+            return false;
+        }
+
+        ESP_LOGI(TAG, "calling udp_recv()...");
+        udp_recv(_pcb, &_udp_recv, (void *)this);
+    }
 
     return true;
 }
-
-void AsyncUdpListener::close()
-{
-    if (_pcb)
-    {
-        if (_connected)
-            _udp_disconnect(_pcb);
-
-        _connected = false;
-    }
-}

src/asyncudplistener.h

@@ -65,6 +65,7 @@ class AsyncUdpListener
 
 public:
     AsyncUdpListener() = default;
+    ~AsyncUdpListener() { close(); }
 
     bool listen(const ip_addr_t *addr, uint16_t port);
 
@@ -93,9 +94,10 @@ public:
 
     void _udp_task_post(udp_pcb *pcb, pbuf *pb, const ip_addr_t *addr, uint16_t port, struct netif *netif);
 
+    void close();
+
 private:
     bool _init();
-    void close();
 
 private:
     cpputils::DelayedConstruction<espcpputils::queue> _udp_queue;