Example shell script seems to get into a weird cookie state

[ryanseddon]

Thanks for the project! I've been using your example shell script to query my powerwall and auth will work fine if there isn't already a cookie or the cookie is still valid but it seems the expiry is quite low and only after an hour will it reject with:

{
  "code": 401,
  "message": "Token Expired"
}

Running the script again seems to go through the create_cookie function but this time it rejects the request stating it has an Invalid bearer token:

{
  "code": 401,
  "error": "User session not found from [token]",
  "message": "Invalid bearer token"
}

It's not until I manually remove the cookie text file that it'll authenticate and work again? Any ideas whats going on here?