NetAtmo-DoAuth

function Netatmo-DoAuth {
        $postParams = @{
                        grant_type='password';
                        client_id=$client_id;
                        client_secret=$client_secret;
                        username=$Netatmo_username;
                        password=$Netatmo_password
                        }

        $Request = Invoke-WebRequest -Uri https://api.netatmo.com/oauth2/token -Method POST -Body $postParams -UseBasicParsing
        if ($Request.StatusCode -eq 200) {
            $ResponseJson = $Request.Content | ConvertFrom-Json
            $global:access_token = $ResponseJson.access_token
            $global:refresh_token =  $ResponseJson.refresh_token
        }
        ELSE
        { 
         write-error -message $Request.StatusDescription -ErrorId $Request.StatusCode
        }
}