code: def rpc_server_port_for_session() -> int:
      return get_free_port()
  
imports: import os
  import random
  from typing import Optional, Union
  import pytest
  import tvm
  import tvm.rpc.tracker
  from tvm.contrib.hexagon.build import HexagonLauncher, HexagonLauncherRPC
  from tvm.contrib.hexagon.session import Session
  from tvm.contrib.hexagon.tools import HEXAGON_SIMULATOR_NAME
label_desc: Use image node_id 8 for calling a global function with example usage: rpc_server_port_for_session() and returns: get_free_port