Hi, i'm using a watch node for checking if there are changes in file. This works if i open a file and save it's contents manually. But the problem lies with the fact when a siemens comfort panel is writing it's log over the ethernet to the file the file is overwritten but it's only changes it's m…

Why do you need the modified date to change?

Every time the siemens panel writes a new alarm to the csv file i want node red to know. So i can load the file and read the last alarm. And i thought the way to see if there is a change in the file you could do it with the date modified. And like i said it works but i have to select the file (not …

The Watch node should tell you every time it gets written to, whether the date changes or not. Is that not working? If not then how is it being written over the network?

That's indeed the strange thing about it. If there is a new alarm and i go look at the directory is see the old date. And no matter how long i wait i have to select it before it does a update of the time. And a soon as the date is updated node red sees it. So node red is handling it fine, it's wind…

You didn't reply to the question, how does it write to the file across the network?

Srr forgot to write that. I've got a shared folder on the PC where node red is installed. And the Siemens Comfort Panel write over the ethernet to that folder. That works because if i call my alarm buffer on the comfort panel it's displaying them. And if i disconnect the panel from the ethernet, i…

[image] Ward: I've got a shared folder on the PC where node red is installed And that may be your problem. I would recommend reading up on filing system watches. Network shares in particular are a problem. You may need to write a polling flow.

Oke will dive deeper into that topic. For the time being i start the flow every hour. Thanks for the reply's

Can you grab the last accessed date (core to Windows API) of the file? Sometimes developers read the file before they write to it? So if last access date/time can give you a clue of when to poll for an update. Thus you would not have to poll 24/7 but only after the last accessed date/time changes…

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Reading modify change on file

General

Ward 8 October 2020 16:35 8

And the protocol to the PC is ethernet/TCP/IP

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Reading modify change on file

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