Dentro de tu clase, tienes que definir la siguiente función: 

def _track_subtype (self, init_values): 
self.ensure_one ()
if 'address_ids' in init_values:
self.message_post (body = "Domicilio Modificado",
partner_id = self.env.user .partner_id.id)
return self.env.ref ('my_model.mt_address_change')
return super (Name_class, self) ._ track_subtype (init_values) 

Y en el XML: 
<record id = "mt_address_change" model = "mail.message.subtype ">
<field name =" name "> Dirección confirmada </field>
<field name =" res_model "> my_model.model </field>
<field name ="predeterminado "eval =" True "/>
<field name = "description"> cambio de dirección! </field>
</record>

Revisar _track_subtype en : https://www.odoo.com/documentation/13.0/reference/mixins.html

I need to write some messages with oe_chatter in the next objects and I'm not understanding how to do it.

event = request.env['calendar.event'].search([('id', '=', meeting_id)])

Anyone can help me?

Thanks!

hi peter were can i add this code ?, because i have the same problem....