feat(ble/bluedroid): Add getter for BLE GAP callback

components/bt/host/bluedroid/api/esp_gap_ble_api.c

@@ -22,6 +22,11 @@ esp_err_t esp_ble_gap_register_callback(esp_gap_ble_cb_t callback)
     return (btc_profile_cb_set(BTC_PID_GAP_BLE, callback) == 0 ? ESP_OK : ESP_FAIL);
 }
 
+esp_gap_ble_cb_t esp_ble_gap_get_callback(void)
+{
+    return (esp_gap_ble_cb_t) btc_profile_cb_get(BTC_PID_GAP_BLE);
+}
+
 #if (BLE_42_FEATURE_SUPPORT == TRUE)
 esp_err_t esp_ble_gap_config_adv_data(esp_ble_adv_data_t *adv_data)
 {

components/bt/host/bluedroid/api/include/api/esp_gap_ble_api.h

@@ -1414,6 +1414,15 @@ typedef void (* esp_gap_ble_cb_t)(esp_gap_ble_cb_event_t event, esp_ble_gap_cb_p
  */
 esp_err_t esp_ble_gap_register_callback(esp_gap_ble_cb_t callback);
 
+/**
+ * @brief           This function is called to get the current gap callback
+ *
+ * @return
+ *                  - esp_gap_ble_cb_t : callback function
+ *
+ */
+esp_gap_ble_cb_t esp_ble_gap_get_callback(void);
+
 #if (BLE_42_FEATURE_SUPPORT == TRUE)
 /**
  * @brief           This function is called to override the BTA default ADV parameters.