chromium/chromeos/components/test/data/onc/cellular_with_smds.onc

{
  "Type": "Cellular",
  "GUID": "cellularGuid",
  "Name": "Test cellular",
  "Cellular": {
    "AllowRoaming": true,
    "AutoConnect": false,
    "SMDSAddress" : "BogusSMDSAddress"
  }
}