text: /*
   * Licensed to the Apache Software Foundation (ASF) under one
   * or more contributor license agreements.  See the NOTICE file
   * distributed with this work for additional information
   * regarding copyright ownership.  The ASF licenses this file
   * to you under the Apache License, Version 2.0 (the
   * "License"); you may not use this file except in compliance
   * with the License.  You may obtain a copy of the License at
   *
   *   https://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  
  #include <plc4c/plc4c.h>
  #include <plc4c/spi/types_private.h>
  
  enum plc4c_driver_modbus_disconnect_states {
    PLC4C_DRIVER_MODBUS_DISCONNECT_INIT,
    PLC4C_DRIVER_MODBUS_DISCONNECT_WAIT_TASKS_FINISHED,
    PLC4C_DRIVER_MODBUS_DISCONNECT_FINISHED
  };
  
  plc4c_return_code plc4c_driver_modbus_disconnect_machine_function(
      plc4c_system_task *task) {
    plc4c_connection *connection = task->context;
    if (connection == NULL) {
      return INTERNAL_ERROR;
    }
  
    switch (task->state_id) {
      case PLC4C_DRIVER_MODBUS_DISCONNECT_INIT: {
        plc4c_connection_set_disconnect(connection, true);
        task->state_id = PLC4C_DRIVER_MODBUS_DISCONNECT_WAIT_TASKS_FINISHED;
        break;
      }
      case PLC4C_DRIVER_MODBUS_DISCONNECT_WAIT_TASKS_FINISHED: {
        // The disconnect system-task also counts.
        if (plc4c_connection_get_running_tasks_count(connection) == 1) {
          plc4c_connection_set_connected(connection, false);
          task->completed = true;
          task->state_id = PLC4C_DRIVER_MODBUS_DISCONNECT_FINISHED;
        }
        break;
      }
      case PLC4C_DRIVER_MODBUS_DISCONNECT_FINISHED: {
        // Do nothing
        break;
      }
      default: {
        return INTERNAL_ERROR;
      }
    }
    return OK;
  }
  
  plc4c_return_code plc4c_driver_modbus_disconnect_function(
      plc4c_connection *connection, plc4c_system_task **task) {
    plc4c_system_task *new_task = malloc(sizeof(plc4c_system_task));
    new_task->state_id = PLC4C_DRIVER_MODBUS_DISCONNECT_INIT;
    new_task->state_machine_function =
        &plc4c_driver_modbus_disconnect_machine_function;
    new_task->completed = false;
    new_task->context = connection;
    new_task->connection = connection;
    *task = new_task;
    return OK;
  }
  