cannot edit parameter (preset -> provision)

[Dan Morphis]

Two things, first use this syntax:
declare("InternetGatewayDevice.WANDevice.***.WANConnectionDevice.***
.WANPPPConnection.***.Username", *{value: Date.now()}*, {value: "user at domain
"});

The reason for the *** is because you cannot guarantee that the instance ID
will always be 1. On the CPE's I have in my lab, WANDevice 1 is ATM, 2 is
PTM, 3 is WAN Ethernet. We use both ATM and eth in our environment.

Second, and the bigger issue is how you are configuring your CPEs. A
giganto switch statement that has to be constantly maintained is
unsustainable. Your provision script should call an external service to
retrieve the un/pw for the CPE. Use this external script as your starting
point: https://pastebin.com/hfZZJB2Z  The getConfig method you might not
need in your environment. In ours, it determines if the CPE is going to be
bridged or routed.

Your provision script will contain the following code:
const now = Date.now();
let serialNumber = declare("DeviceID.SerialNumber", {value: 1}).value[0];
let productClass = declare("DeviceID.ProductClass", {value: 1}).value[0];
let oui = declare("DeviceID.OUI", {value: 1}).value[0];
let args = {serial: serialNumber, productClass: productClass, oui: oui};

//Get the PPPoE creds
let config = ext('cpe-config', 'resetPppoe', JSON.stringify(args));
if (!config) {
  log('No config returned from API');
  return;
}

declare("InternetGatewayDevice.WANDevice.*.WANConnectionDevice.*.WANPPPConnection.*.Username",
{value: now}, {value: config.username});
declare("InternetGatewayDevice.WANDevice.*.WANConnectionDevice.*.WANPPPConnection.*.Password",
{value: now}, {value: config.password});

Because the script can be called multiple times, you will either want to
have your API cache the password for 10 minutes and return the password
from cache; or make your CPE password deterministic. In my environment I
combine the CPE serial number, the pppoe username and a secret value. Then
I hash that and return 16 chars from the hash. This allows the provisioning
script to be called multiple times without any issues.

-dan
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