server-tools/external_file_location/data/cron.xml

<?xml version="1.0" encoding="UTF-8"?>
<openerp>
    <data>
        
        <record model="ir.cron" id="cronjob_run_exchange_tasks">
            <field name='name'>Run file exchange tasks</field>
            <field name='interval_number'>30</field>
            <field name='interval_type'>minutes</field>
            <field name="numbercall">-1</field>
            <field name="active">True</field>
            <field name="doall" eval="False" />
            <field name="model">external.file.task</field>
            <field name="function">run_task_scheduler</field>
            <field name="args">([[('method_type', '=', 'import')]])</field>
        </record>

    </data>
</openerp>