gap: add gap_reconnect_security_setup_active indicating security setup as central

src/ble/sm.c

@@ -4044,3 +4044,26 @@ void gap_advertisements_set_params(uint16_t adv_int_min, uint16_t adv_int_max, u
         direct_address_typ, direct_address, channel_map, filter_policy);
 }
 #endif
+
+int gap_reconnect_security_setup_active(hci_con_handle_t con_handle){
+    sm_connection_t * sm_conn = sm_get_connection_for_handle(con_handle);
+     // wrong connection
+    if (!sm_conn) return 0;
+    // already encrypted
+    if (sm_conn->sm_connection_encrypted) return 0;
+    // only central can re-encrypt
+    if (sm_conn->sm_role == HCI_ROLE_SLAVE) return 0;
+    // irk status?
+    switch(sm_conn->sm_irk_lookup_state){
+        case IRK_LOOKUP_FAILED:
+            // done, cannot setup encryption
+            return 0;
+        case IRK_LOOKUP_SUCCEEDED:
+            break;
+        default:
+            // IR Lookup pending
+            return 1;
+    }
+    // IRK Lookup Succeeded, re-encryption should be initiated. When done, state gets reset
+    return sm_conn->sm_engine_state != SM_INITIATOR_CONNECTED;
+}

src/gap.h

@@ -555,6 +555,15 @@ int gap_ssp_confirmation_negative(bd_addr_t addr);
 void gap_le_get_own_address(uint8_t * addr_type, bd_addr_t addr);
 
 
+/**
+ * @brief Get state of connection re-encryptiong for bonded devices when in central role
+ * @note used by gatt_client and att_server to wait for re-encryption
+ * @param con_handle
+ * @return 1 if security setup is active
+ */
+int gap_reconnect_security_setup_active(hci_con_handle_t con_handle);
+
+
 /* API_END*/
 
 #if defined __cplusplus