To add a log record, use the command item/add_log_record:

svc=item/add_log_record&params={"itemId":<long>,
				"action":<text>,
				"newValue":<text>,
				"oldValue":<text>}

List of available actions:

• custom_msg;
• create_unit;
• update_name;
• update_access;
• update_unit_icon;
• update_unit_pass;
• update_unit_phone;
• update_unit_calcflags (update sensor calculation settings);
• update_unit_milcounter (update mileage counter value);
• update_unit_bytecounter (update GPRS traffic counter value);
• update_unit_ehcounter (update engine hours counter value);
• update_unit_uid;
• update_unit_hw (update device type);
• update_unit_hw_cfg (update device configuration);
• update_unit_fuel_cfg (update fuel consumption configuration);
• update_unit_trip_cfg (update trip detection configuration);
• create_sensor;
• update_sensor;
• delete_sensor;
• create_alias (create command);
• update_alias (update command);
• delete_alias (delete command);
• create_service_interval;
• update_service_interval;
• delete_service_interval;
• create_custom_field;
• update_custom_field;
• delete_custom_field;
• import_item_cfg;
• import_unit_cfg;
• export_unit_msgs;
• import_unit_msgs;
• delete_unit_msg;
• delete_unit_msgs;
• bind_unit_driver;
• unbind_unit_driver;
• bind_unit_trailer;
• unbind_unit_trailer;
• update_unit_report_cfg (update parameters used in reports);
• update_msgs_filter_cfg (update filtration of unit position information in messages);
• delete_item;
• create_user;
• update_hosts_mask;
• update_user_pass;
• update_user_flags;
• create_user_notify;
• delete_user_notify;
• create_group;
• units_group (add/remove units to/from unit group);
• update_driver_units (update the list of auto attachable units for drivers);
• update_trailer_units (update the list of auto attachable units for trailers);
• create_resource;
• create_zone;
• update_zone;
• delete_zone;
• create_poi;
• update_poi;
• delete_poi;
• create_job;
• switch_job;
• update_job;
• delete_job;
• create_notify;
• switch_notify;
• update_notify;
• delete_notify;
• create_driver;
• update_driver;
• delete_driver;
• create_trailer;
• update_trailer;
• delete_trailer;
• create_drivers_group;
• update_drivers_group;
• delete_drivers_group;
• create_trailers_group;
• update_trailers_group;
• delete_trailers_group;
• create_report (create report template);
• update_report (update report template);
• delete_report (delete report template);
• import_pois;
• import_zones;
• create_retranslator;
• update_retranslator;
• units_retranslator (add units for retranslation);
• switch_retranslator;
• create_route;
• update_route_points;
• update_route_cfg;
• create_round;
• update_round;
• delete_round;
• create_schedule;
• update_schedule;
• delete_schedule;
• create_account;
• delete_account;
• switch_account;
• update_dealer_rights;
• do_payment;
• update_account_flags;
• update_account_min_days;
• update_account_plan;
• update_account_history_period;
• update_account_subplans;
• create_service;
• update_service;
• delete_service.

{}	/* empty object if execution successful, if not - error code */