/// <summary>Verify if a system is online or not.</summary>
/// <param name="elementNumber">The system identifier to query.</param>
/// <param name="IsOnline">[out] Online status on the train. In case of error, value is forced to false.</param>
/// <returns>The success of the operation. Possible values are:
/// <list type="table">
/// <listheader><term>Error code</term><description>Description</description></listheader>
/// <item><term>T2GManagerErrorEnum.eSuccess</term><description>Service retrieved successfully and it is available</description></item>
/// <item><term>T2GManagerErrorEnum.eElementNotFound</term><description>Queried system is unknown.</description></item>
/// <item><term>T2GManagerErrorEnum.eT2GServerOffline</term><description>T2G services are down.</description></item>
/// </list>
/// </returns>
public T2GManagerErrorEnum IsElementOnline(string elementNumber, out bool isOnline)
{
T2GManagerErrorEnum lReturn = T2GManagerErrorEnum.eFailed;
isOnline = false;
if (T2GServerConnectionStatus)
{
// Get connection status of element first to improve speed when system is online.
// Then, check if the element exist.
isOnline = _localDataStorage.IsElementOnline(elementNumber);
if (isOnline || _localDataStorage.ElementExists(elementNumber))
{
lReturn = T2GManagerErrorEnum.eSuccess;
}
else
{
lReturn = T2GManagerErrorEnum.eElementNotFound;
}
}
else
{
lReturn = T2GManagerErrorEnum.eT2GServerOffline;
}
return(lReturn);
}
