# Bacnet unstable. Max APDU Length

**URL:** <https://forum.inductiveautomation.com/t/bacnet-unstable-max-apdu-length/74338>\
**Category:** Ignition\
**Created:** [May 31, 2023, 9:40am UTC](https://forum.inductiveautomation.com/t/bacnet-unstable-max-apdu-length/74338 "2023-05-31T09:40:11Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![ekb](https://avatars.discourse-cdn.com/v4/letter/e/e79b87/32.png) [@ekb](https://forum.inductiveautomation.com/u/ekb)\
**Post date:** [May 31, 2023, 9:40am UTC](https://forum.inductiveautomation.com/t/bacnet-unstable-max-apdu-length/74338/1 "2023-05-31T09:40:11Z")

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Ignition. Version: **8.1.27 (b2023042509)**  
[network\_storm\_linux2.pcap](https://forum.inductiveautomation.com/uploads/short-url/mTu2wOFy37S34T3wtKtoiq14gRf.pcap) (102.1 KB)  
[network\_storm\_linux.pcap](https://forum.inductiveautomation.com/uploads/short-url/mrkjAP9xS5ed9XcnG7pVqVKudFP.pcap) (808.3 KB)

I experience the bacnet driver in Ignition as unstable.  
I see that I have values in the bacnet client, and on the website of the bacnet device.  
But in ignition, the values suddenly disappear, or they are stuck at what they were.

Max APDU Length. 480. it says on my device. Is there anywhere in Ignition I can put this on the device. Can't find it  
I have experienced a similar problem with other systems where this is set higher. Then it helps to set this to 480, which the device supports.

I have som tcpdump files if that helps  
IP adresser BacnetID  
10.80.4.10 11000 Ignition server  
10.80.195.2 2001 360.001 VE-1 Kontor  
10.80.195.3 2000 360.002 VE-2 Lager

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/7/5/7520864d8a64f390cb4d26f85e4880a23363ddb0.png)  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/4/e/4ee1bd23d57e2c8cab21ac49e1b858954e932ec5.png)  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/0/0/00af2a85901f4d8d163dbc592d4a6cb597e0b708.png)  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/2/3/2329828899cd593d3ebc5ac2d22523521652dc63.png)  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/0/8/0871f0bdc0fc47fae56dd474ebc3b05ec31c1467.png)

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<div class="post-metadata">

**Author:** ![Lina\_Su](https://avatars.discourse-cdn.com/v4/letter/l/7ba0ec/32.png) [@Lina\_Su](https://forum.inductiveautomation.com/u/Lina_Su)\
**Post date:** [February 23, 2024, 5:41am UTC](https://forum.inductiveautomation.com/t/bacnet-unstable-max-apdu-length/74338/2 "2024-02-23T05:41:41Z")

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Have you fixed this issue ?

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<div class="post-metadata">

**Author:** ![ekb](https://avatars.discourse-cdn.com/v4/letter/e/e79b87/32.png) [@ekb](https://forum.inductiveautomation.com/u/ekb)\
**Post date:** [February 23, 2024, 12:50pm UTC](https://forum.inductiveautomation.com/t/bacnet-unstable-max-apdu-length/74338/3 "2024-02-23T12:50:22Z")

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I don't really remember if I did anything special. We came to the conclusion that we could not run ignition in docker. It wasn't that easy to get the bacnet up and running properly there. Otherwise, I ran the import of the tags through a script so that I got the info I was interested in.

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