# Request for Multi-Device QR Code Scanning Solution **URL:** \ **Category:** Ignition\ **Tags:** ignition81, perspective\ **Created:** [September 5, 2024, 6:20am UTC](https://forum.inductiveautomation.com/t/request-for-multi-device-qr-code-scanning-solution/95569 "2024-09-05T06:20:28Z")\ **Posts on this page:** 6\ **Page:** 1
**Author:** ![Rajashekar\_Reddy](https://avatars.discourse-cdn.com/v4/letter/r/c0e974/32.png) [@Rajashekar\_Reddy](https://forum.inductiveautomation.com/u/Rajashekar_Reddy)\ **Post date:** [September 5, 2024, 6:20am UTC](https://forum.inductiveautomation.com/t/request-for-multi-device-qr-code-scanning-solution/95569/1 "2024-09-05T06:20:28Z")
Dear Team, I am currently engaged in the Barcode System Project, which is operational for a single mobile client. Following the tutorial from Inductive University on barcode scanning,- [Barcode Scanned Video at Inductive University](https://inductiveuniversity.com/videos/barcode-scanned/8.1) - I encountered an issue where the camera fails to activate when accessed via a web browser. we understood that "Ignition Perspective" app is required for functionality, necessitating a intranet network connection for barcode scanning. My concern lies in the limitation to one mobile client due to the **global tag connected** at "Session Events \> Barcode," as demonstrated in the video at the **01:33** mark. **I am seeking an efficient method to enable QR code reading from various devices such as tablets, mobiles for multiple clients.** Your insights on this matter would be greatly appreciated. If you have any recommendations or alternative solutions, please share them with me. Best regards, B.R.Reddy. ---
**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\ **Post date:** [September 5, 2024, 6:40am UTC](https://forum.inductiveautomation.com/t/request-for-multi-device-qr-code-scanning-solution/95569/2 "2024-09-05T06:40:41Z")
> [@Rajashekar\_Reddy](#): > > activate when accessed via a web browser To give the browser permission to access a local camera via browser, you'll need to use SSL / HTTPS and then you'll get a permission prompt to allow access. For testing, you can just use a self-signed certificate that Ignition can generate for you. Browsers are not permitted to access a local camera without a secure connection. ---
**Author:** ![Rajashekar\_Reddy](https://avatars.discourse-cdn.com/v4/letter/r/c0e974/32.png) [@Rajashekar\_Reddy](https://forum.inductiveautomation.com/u/Rajashekar_Reddy)\ **Post date:** [September 5, 2024, 9:15am UTC](https://forum.inductiveautomation.com/t/request-for-multi-device-qr-code-scanning-solution/95569/3 "2024-09-05T09:15:21Z")
Hello @nminchin, Thank you for your response. Could you please provide guidance on generating a self-signed certificate in Ignition? My concern lies in the limitation to one mobile client due to the **global tag connected** at "Session Events \> Barcode," as demonstrated in the video at the **01:33** mark. **I am seeking an efficient method to enable QR code reading from various devices such as tablets, mobiles for multiple clients in same application with different screens** ---
**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\ **Post date:** [September 5, 2024, 9:52am UTC](https://forum.inductiveautomation.com/t/request-for-multi-device-qr-code-scanning-solution/95569/4 "2024-09-05T09:52:09Z")
A session event is attached to a single session only, so you can use this for as many sessions as you need to have on other devices, where a session is essentially an open perspective client. Ah, I actually watched the video this time and see what youre talking about. If your barcode scanning should be limited to the session, then you wouldn't write the result into a tag. To might write it into a session custom prop instead, or even push it through to your view using a send Message (you could make it universal in this case). You would most likely want to use a uuid in that case however to know where the event came from and if it's for the component that has the msg event handler on it. You can generate a uuid with Java using: ```python from Java.util import UUID str(UUID.randomUUID()) ``` I have a script library with a wrapper for that function. Generate a uuid in a custom prop on your bar code scan component and sentls that through with your barcode scan action. I can elaborate when I'm back at my laptop if you need ---
**Author:** ![Rajashekar\_Reddy](https://avatars.discourse-cdn.com/v4/letter/r/c0e974/32.png) [@Rajashekar\_Reddy](https://forum.inductiveautomation.com/u/Rajashekar_Reddy)\ **Post date:** [September 5, 2024, 11:47am UTC](https://forum.inductiveautomation.com/t/request-for-multi-device-qr-code-scanning-solution/95569/5 "2024-09-05T11:47:42Z")
Hello @nminchin, Thank you for your response. If you don't mind, could you share the script library and a wrapper for that function? Guidance would be much appreciated! ---
**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\ **Post date:** [September 5, 2024, 11:57pm UTC](https://forum.inductiveautomation.com/t/request-for-multi-device-qr-code-scanning-solution/95569/6 "2024-09-05T23:57:39Z")
```python # library: shared.util from java.util import UUID def getUUID(): return str(UUID.randomUUID()) ``` Session Event: ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/0/5/054500ad71d73ab45cd946b5df8a7007227477e4.png) Button on view (copy this and paste into a View): ```python [ { "type": "ia.input.button", "version": 0, "props": { "text": "Scan Barcode" }, "meta": { "name": "Button" }, "position": { "basis": "34px" }, "custom": {}, "propConfig": { "custom.uuid": { "binding": { "type": "expr", "config": { "expression": "1" }, "transforms": [ { "code": "\treturn shared.util.getUuid()", "type": "script" } ] } } }, "events": { "component": { "onActionPerformed": { "type": "native/barcode", "scope": "C", "config": { "config": { "type": "ANY", "backgroundColor": "AUTO", "cameraPreference": "BACK", "uuid": "43a52965-b7b9-4834-b205-4ea7c7d75384" }, "context": { "uuid": "{this.custom.uuid}" } } } } }, "scripts": { "customMethods": [], "messageHandlers": [ { "messageType": "barcode-scanned", "script": "\tthisUUID = self.custom.uuid\n\tscannedUUID = payload['uuid']\n\tif thisUUID == scannedUUID:\n\t\t#do something", "sessionScope": true, "pageScope": false, "viewScope": false } ], "extensionFunctions": null } } ] ``` \*\* Untested