Issue3：Linux Gateway App v1.0.1中ota state machine的执行逻辑是怎样的？

void ota_enable_state_machine(bool timed_out, void * arg)
{
 static int state = 0;
 static int current_ota_file_index;
 bool rerun_state_machine = true;

 if ((arg == NULL) && (state != 0))
 {
  printf("OTA-Enable already in progress");
  return;
 }
  
 if (si_is_server_ready(SI_SERVER_ID_OTA) == false)
 {
  printf("ota_enable_state_machine: ERROR: OTA server not connected");
  state = 6;
 }
 else if ((!timed_out) || (state == 0))
 {
  state++;
 }
 
 while (rerun_state_machine)
 {
  printf("OTA-Enable state %d\n", state);
  
  rerun_state_machine = false;
  switch (state)
  {
   case 1:
    if (si_register_idle_callback(ota_enable_state_machine, NOT_NULL) == 0)
    {
     if (si_is_waiting_for_confirmation() == false)
     {
      state++;
      rerun_state_machine = true;
     }
    }
    else
    {
     state = 0;
     printf("WARNING: OTA-Enable state machine cannot be initialized at this time");
    }
    break;
   case 2:
    enable_ota_upgrade();  //OTA enable   3:OTA_UPDATE_ENABLE_REQ    4:OTA_UPDATE_ENABLE_CNF
    break;
   case 3:
    ota_register("./sample_app_ota.cfg");
    current_ota_file_index = 0;
    state++;
    rerun_state_machine = true;
    break;
   case 4:
    //if(DeviceList_Router[0] == router_of_config[i])
           register_single_file(current_ota_file_index); //OTA register  2: IMAGE_REGISTERATION_REQ  0:ZIGBEE_GENERIC_CNF
           //printf("router_of_config[%d] = %Lx\n", i, router_of_config[i]);
    //printf("DeviceList_Router[0] = %Lx\n", DeviceList_Router[0]);
    break;
   case 5:
    current_ota_file_index++;
    if (current_ota_file_index < upgrade_num_files)
    {
     state--;
    }
    else
    {
     state++;
    }
    rerun_state_machine = true;
    break;
   case 6:
    si_unregister_idle_callback();
    state = 0;
    break;
   default:
    break;
  }
 }
}