Fix #287: wifi_manager_stop causes panic handler when it is called be…

…fore wifi_manager_start (#288)

* Fix #287: wifi_manager_stop causes panic handler when it is called before wifi_manager_start

* [#287] Fix code smell found by SonarCloud

src/wifi_manager.c

@@ -274,6 +274,10 @@ wifi_manager_disable_wps(void)
 void
 wifi_manager_stop(void)
 {
+    if (!wifi_manager_is_initialized())
+    {
+        return;
+    }
     if (!wifiman_msg_send_cmd_stop_and_destroy())
     {
         LOG_ERR("%s failed", "wifiman_msg_send_cmd_stop_and_destroy");

src/wifi_manager_internal.c

@@ -50,6 +50,16 @@ static os_sema_static_t g_scan_sync_sema_mem;
 static os_mutex_recursive_t        g_p_wifi_mutex;
 static os_mutex_recursive_static_t g_wifi_manager_mutex_mem;
 
+bool
+wifi_manager_is_initialized(void)
+{
+    if (NULL == g_p_wifi_mutex)
+    {
+        return false;
+    }
+    return true;
+}
+
 void
 wifi_manager_init_mutex(void)
 {

src/wifi_manager_internal.h

@@ -85,6 +85,9 @@ extern EventGroupHandle_t g_p_wifi_manager_event_group;
 extern esp_wps_config_t g_wps_config;
 extern bool             g_wifi_wps_enabled;
 
+bool
+wifi_manager_is_initialized(void);
+
 void
 wifi_manager_init_mutex(void);