Take a look here: https://www.odoo.com/documentation/8.0/reference/orm.html#openerp.models.Model.write

Have you try something like 'public_categ_ids' => array(array(6,0, array( 81 )))   that should generate the equivalent of   ( 'public_categ_ids' = [(6, 0, [81])] )

    $url = "http://127.0.0.1:8069";
    $db = "8.0-debug";
    $username = "admin";
    $password = "admin";
    require_once('ripcord.php');
    $common = ripcord::client("$url/xmlrpc/2/common");
    $uid = $common->authenticate($db, $username, $password, array());
    $models = ripcord::client("$url/xmlrpc/2/object");
    $vals = array(
                array( 
                    'name' => 'test', 
                    'default_code' => '1111', 
                    'public_categ_ids' =>  array(
                        array(6,0, array(1))
                    )
                )
            );
    $create = $models->execute_kw($db, $uid, $password,
        'product.product', 'create', $vals
    );
    echo $create;

Hi Jérémy,

Thx for your reply.

I tried with...

'public_categ_ids' => array( array( 0,0, array( 81 ) ) ), error => cannot convert dictionary update sequence element #0 to a sequence

'public_categ_ids' => array(  0,0, array( 81 )  ),  no error, not working

'public_categ_ids' => array(  6,0, array( 81 )  ),  no error, not working

ps. i'm trying to create, not to update products