Hi all, I have a problem with using MQTT between two Ignition gateways. The edge gateway is supposed to send tag data via MQTT to a central gateway, but we are having thread deadlocking issues at the central gateway level. No idea what’s causing it, but I’m assuming it’s coming from the MQTT Engine…

Hey Roger, i’m also testing out MQTT and i also am getting that “Blocked” State, and eventual lock. In my test I have an edge server with only MQTT Transmission and its sending to the Ignition gateway which is running the MQTT engine and MQTT Distributor. It runs fine for a while then i see the va…

Hi, We have very similar, if not the same, architectures! I’m also running a remote simulator via KepwareEX which is sending data through OPC UA to the edge server, so i’m getting data at that Ignition installation just fine, but while being sent via MQTT it just crashes the central/remote gateway.…

Can one of you guys get a thread dump while this is happening? I’m sure Cirrus Link will ask for one as well.

Hi Kevin, I will definitely do that if I can replicate the issue!

Do let me know what they come up with. I’ve contacted support also, but haven’t heard a response back yet.

Hi everyone, I spoke with Cirrus Link today and part of my issue was with my architecture being incorrect initially, but after correcting it, deleting an extraneous UDT in the central gateway’s MQTT Engine tag provider caused another thread deadlocking. I got the Ignition thread dump if anyone is i…

Hi guys, I don't really see a concrete solutions or a reason why the deadlock was caused. We are getting the same error, which looks like it's being triggered by MQTT Transmission. Did any of you ever find out why this occured in your cases? What are the general reasons for a deadlock? Would a dea…

Deadlock is almost always a programming bug and needs to be resolved by upgrading after it has been fixed. If you're running into a deadlock then provide the thread dump and Ignition/module versions. If you're on older versions then expect to upgrade first.

Here is the Cirrus Link/Ignition version compatibility chart.

Thanks for both your replies. @justinedwards.jle it is compatible but thanks for the chart. @Kevin.Herron we are on 8.1.18, so I guess we could first do an upgrade and check if that works. If it doesn't, I guess we should log a support ticket to see what's going on.

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MQTT Issues in Ignition

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