feat(nimble): Added API to get resolve ADV data

nimble/host/include/host/ble_esp_gap.h

@@ -49,6 +49,20 @@ int ble_gap_host_check_status(void);
 int
 ble_gap_dev_authorization(uint16_t conn_handle, bool authorized);
 
+/**
+ * This API is called to get ADV data for a specific type.
+
+ *
+ * @param adv_data                  Pointer of ADV data (unsigned 8 bit integer) which to be resolved.
+ * @param adv_type                  Finding ADV data type.
+ * @param adv_data_len              Total length of Advertising data.
+ * @param length                    Return the length of ADV data not including type.
+ *
+ * @return                          Pointer (unsigned 8 bit integer) of type specific ADV data.
+ */
+uint8_t*
+ble_resolve_adv_data(const uint8_t *adv_data, uint8_t adv_type, uint8_t adv_data_len , uint8_t * length);
+
 #ifdef __cplusplus
 }
 #endif

nimble/host/src/ble_gap.c

@@ -728,6 +728,22 @@ ble_gap_set_prefered_le_phy(uint16_t conn_handle, uint8_t tx_phys_mask,
                              &cmd, sizeof(cmd), NULL, 0);
 }
 
+uint8_t* ble_resolve_adv_data(const uint8_t *adv_data, uint8_t adv_type, uint8_t adv_data_len , uint8_t * length)
+{
+    int rc = 0;
+    const struct ble_hs_adv_field *fields;
+    const uint8_t *data;
+
+    rc = ble_hs_adv_find_field(adv_type, adv_data, adv_data_len, &fields); /*Fill adv field*/
+
+    if (rc == 0) {
+        *length = fields->length -1 ; /* minus length of type*/
+        data  = fields->value;  /* Type specific adv data*/
+        return (uint8_t*)data;
+    }
+
+    return NULL;
+}
 /*****************************************************************************
  * $misc                                                                     *
  *****************************************************************************/