I am working on an Odoo 18 POS system and I need to implement a feature where a POS order is cancelled from the backend (via Python), and once cancelled, the frontend should be notified in real-time to update the order status without requiring a manual refresh.

Here is the backend code where the order is being cancelled 

class PosOrderCancelWizard(models.TransientModel):

    _name = 'pos.order.cancel.wizard'

    _description = 'POS Order Cancel Wizard'

    reason = fields.Text(string="Reason", required=True)

    order_id = fields.Many2one('pos.order', string="POS Order", required=True, default=lambda self: self.env.context.get('default_order_id'))

    def action_confirm(self):

        self.ensure_one()

        if self.order_id:

            self.order_id.reason = self.reason

            self.order_id.action_pos_order_cancel()