Hi,

For safety use, it's better to have null check for all variables which are used in this function.

if (!_sessionPriv.$clientAlarmList) {
    return;
}

↓

if (!_sessionPriv.$clientAlarmList
     || !_sessionPriv.$monitoredItemForAlarmList
     || !_sessionPriv.$subscriptionforAlarmList ) {
    return;
}

https://github.com/node-opcua/node-opcua/blob/master/pack

Problem description

We only allow timeseries data to be added to the model from CSV. Ideally we would also have the possibility of having e.g. resource: dataframe=df:column for any dataframe df loaded into the current instance of Python.

Steps to introduce functionality

• Decide on syntax for calling a dataframe
  • The most likely is to follow the same as ``...: fil