Mobile Barcode Scanner Not Updating Memory Tag

[Joe_Kelly]

I’m attempting to follow the Barcode Scanned example in the Ignition 8.1 documentation (Perspective Session Event Scripts - Ignition User Manual 8.1 - Ignition Documentation). When I scan the barcode from the mobile app (iOS), it scans, but the table doesn’t change.

I have my memory tag in the root of my tag browser, and I also put in a vibration call as well as some logging to keep track. Based off that, I can confirm that It is getting the barcode scan data and it’s getting the text from the barcode, but it doesn’t seem to be updating the memory tag.

A few other things I’ve tried:

• writeBlocking instead of writeAsync
• Pulled the inputs to writeAsync outside of the array brackets
• Binding the memory tag to a label and a text input field

Here is my code:

logger = system.util.getLogger(Barcode Logger)|

system.perspective.vibrateDevice()|
logger.info(data.text)|
system.tag.writeBlocking([[Tags]Barcode_Tag], [data.text])

[pturmel]

Replace this:

system.tag.writeBlocking([[Tags]Barcode_Tag], [data.text])

with:

system.tag.writeBlocking(["[Tags]Barcode_Tag"], [data.text])

[Joe_Kelly]

I tried adding the quote marks, and it still isn’t updating the tag or the bound field.

[pturmel]

You’ll have to show more of your scripting and your tag provider layout.

[Joe_Kelly]

Tag Provider Layout:

Binding to text field (the idea is to have the option to scan the serial number or type it manually):

Session Events Script:

Button onClick Event:

[pturmel]

Hmm. Not obvious to me.

[PGriffith]

If you make a copy of Barcode_Tag, and use that path in the script, does that tag write?

[Joe_Kelly]

I made a copy of Barcode_Tag and it created “Barcode_Tag 1”. I copied the path (i.e. right-click the tag, Copy Path) and pasted the new path in the session event script. No dice.

[Joe_Kelly]

Alright, a new development. I created a blank project to test it out and the barcode example worked flawlessly. I noticed that when it worked, I was using a different Tag Provider. I tried using the original tag provider and it stopped working! I went back to my original project and tried using the incorrect tag provider and it started working!

I checked both projects’ properties to look for any differences and couldn’t see any. I decided to look at the settings for the tag providers and I found that the original tag provider was set to Read Only. I turned that off, and not surprisingly, the barcode scanner started working.

I’m kind of surprised nothing came up in the logs about trying to write to a Read Only tag provider. Is this something that can be added in future versions?

[pturmel]

You would have been able to see that status in the return value from system.tag.writeBlocking or in the callback from system.tag.writeAsync.

[Joe_Kelly]

Ahh, ok. I didn’t know they had return values. Thanks!