+1Customer is reporting that when printing carrier labels from Easy Post to Device Hub there are 2 copies of the same label printed
- there is only one job created
- the printer is configured to print 1 copy
- is has been confirmed the zpl label file only contains only one label
- the printer has been reset
What could cause this issue? How can this be resolved
Best answer by schneur96
Hi
Were are on 24R2
Acumatica sends print jobs to Device Hub using push notifications (NT). Device Hub also has a polling (POLL) mechanism as a fallback in case a push notification is missed.
In our logs, we saw cases where push and polling were triggering almost simultaneously. Polling would sometimes pick up the job before Device Hub had time to confirm successful processing back to Acumatica, which caused the same job to be processed twice—resulting in duplicate prints.
Our review:
Only one print job was created in Acumatica
Printer was set to print a single copy
Label/ZPL file contained only one label
Print timing was consistent with historical behavior
What we recommend checking/trying:
Review Device Hub push notification and polling settings
Confirm both are enabled
Make sure polling is not set too aggressively
Increase the polling interval
We extended polling from ~30 seconds to ~90 seconds
We also excluded the last 10–15 seconds of the polling window to give push notifications time to complete
After making these changes, the issue still happens, but not very often.
+16Using Task Manager, make sure there isn’t more than one instance of DeviceHub running on the same machine or even DeviceHub running on multiple machines.
+8What version and build Client using both ERP and DeviceHub?
DId not see an answer to this. We are also seeing this. We just upgraded to 2024 r1 and that is when it started. Part of the upgrade required a new version of Device Hub.
Is polling and push settings the issue ?
We are also having this issue and are currently on 2024 R1. How do you check push notification and polling settings?
Found out due to error handling on the end of the API calls, we where calling a second time. Did not see it until we where seeing duplicate requests.
+16
I see the push notification and polling settings. How do the settings affect the printing? What settings might cause duplicate labels to be printed?
Thanks, Tom
Hi
Were are on 24R2
Acumatica sends print jobs to Device Hub using push notifications (NT). Device Hub also has a polling (POLL) mechanism as a fallback in case a push notification is missed.
In our logs, we saw cases where push and polling were triggering almost simultaneously. Polling would sometimes pick up the job before Device Hub had time to confirm successful processing back to Acumatica, which caused the same job to be processed twice—resulting in duplicate prints.
Our review:
Only one print job was created in Acumatica
Printer was set to print a single copy
Label/ZPL file contained only one label
Print timing was consistent with historical behavior
What we recommend checking/trying:
Review Device Hub push notification and polling settings
Confirm both are enabled
Make sure polling is not set too aggressively
Increase the polling interval
We extended polling from ~30 seconds to ~90 seconds
We also excluded the last 10–15 seconds of the polling window to give push notifications time to complete
After making these changes, the issue still happens, but not very often.
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