[ADD] value for T400 on encoder for gls belgium

[mathieudelva]

This field "parcel_sequence" allows you to add a value to T400 which is mandatory for Belgium.
The value of the field parcel_sequence is calculated on Odoo module like this:

vals["parcel_sequence"] = self.calc_parcel_num() --> I added this line in the inheritance of the function _gls_fr_glsbox_get_parcel(self, picking)

@api.model
def _get_sequence(self):
    sequence = self.env["ir.sequence"].next_by_code("delivery_carrier_gls")
    if not sequence:
        raise UserError(_("There is no sequence defined for the label GLS"))
    return sequence

def calc_parcel_num(self):
    start_num = (
        self.env["ir.config_parameter"]
        .sudo()
        .get_param("PARCEL_NUM_START", 01234567890)
    )
    parcel_num = self._get_sequence()
    num = int(start_num) + int(parcel_num)
    num = str(num)
    num = list(num)
    num.reverse()
    weighting = 3
    sum_of_num = 0
    for item in num:
        sum_of_num += int(item) * weighting
        if weighting == 3:
            weighting = 1
        else:
            weighting = 3
    sum_of_num += 1
    check_num = int(math.ceil(sum_of_num / 10.0)) * 10 - sum_of_num
    num.reverse()
    num.append(str(check_num))
    return "".join(num)

[florian-dacosta]

Hello @math0706 thanks for the contribution.
That's strange, GLS told me quite recenlty that its web service was country dependent. Meaning it works for France but not for spain for example.

I guess maybe france and Belgium are together...
The T400 value has no description in the documentation I have... But I see it is already present in the ZPL template https://github.com/akretion/roulier/blob/master/roulier/carriers/gls_fr/glsbox/templates/zpl.zpl#L75

So I guess there are not problem.
I'll make a quick test later to validate and I should be able to merge your PR quicky enough.

Where is the Odoo code you are talking about ?

FYI, in version 14, there is this module that manage the glsbox api :
https://github.com/akretion/delivery-carrier/tree/14.0-mig-delivery_roulier_gls_fr
Which is used in production since the begging of the year (by a french company)
And https://github.com/akretion/delivery-carrier/tree/14-gls-rest-webservice
Which is not yet used in production but should be soon, it implements a more modern webservice which allow more stuff (multi parcel, ship worlwide, etc...)
GLS has still one more rest webservice, a kind of v2 I think but it is not implemented at all in roulier for now.
All of this for France, but maybe for Belgium too then...