$helper = new NAApiHelper($client);
try {
    $tokens = $client->getAccessToken();
} catch (NAClientException $ex) {
    echo "An error happend while trying to retrieve your tokens\n";
    exit(-1);
}
// Retrieve User Info :
$user = $helper->api("getuser", "POST");
echo "-------------\n";
echo "- User Info -\n";
echo "-------------\n";
//print_r($user);
echo "OK\n";
echo "---------------\n";
echo "- Device List -\n";
echo "---------------\n";
$devicelist = $helper->simplifyDeviceList();
echo "OK\n";
echo "-----------------\n";
echo "- Last Measures -\n";
echo "-----------------\n";
$mesures = $helper->getLastMeasures();
print_r($mesures);
echo "OK\n";
echo "---------------------\n";
echo "- Last Day Measures -\n";
echo "---------------------\n";
$mesures = $helper->getAllMeasures(mktime() - 86400);
print_r($mesures);
echo "OK\n";