Wireless Access

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Access network design for branch, remote, outdoor and campus locations with Aruba access points, and mobility controllers.
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Wifi latency with android barcode reader

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  • 1.  Wifi latency with android barcode reader

    Posted Oct 22, 2021 05:24 AM
    Hi,
    our customer have problem with the Android barcode reader, the used app is randomly crashing.
    He is starting to affirm that the cause of this problem could be a long latency.
    So he did some tests, connecting two devices under the same AP, a microsoft notebook and an Android barcode reader and arrived to this results:
    - Microsoft notebook has a latency of 3-4 ms;
    - Android barcode reader has a latency of 100-140 ms.

    Both the client are connected at 5GHz., at the same distance from the AP.

    How could be explained this difference in the latency?

    Thanks!
    Kind regards.
    Michele

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    Michele Romano
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  • 2.  RE: Wifi latency with android barcode reader

    Posted Oct 22, 2021 05:59 AM
    How is the customer performing this test?  The customer should ping from the wired network to wireless clients to test response.

    Does that wlan have broadcast filtering enabled?

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    Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.
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  • 3.  RE: Wifi latency with android barcode reader

    Posted Oct 22, 2021 08:45 AM
    The customer is pinging the wireless devices from a wired windows PC in the same vlan.
    The broadcast filtering is set as ARP, but he tried also to disable it, without any significative change.

    Thank you!
    Kind regards.

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    Michele Romano
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  • 4.  RE: Wifi latency with android barcode reader

    Posted Oct 22, 2021 09:18 AM
    ARP is the correct setting.  Different clients have different RF characteristics.  A smaller battery-powered client could sleep more often to provide better battery life.  100ms is not bad, unless it is disrupting the application.  You should do a constant ping to see if the handheld scanner drops too many pings in a row.  I have seen where just scanning will make a device drop a ping.  In that case, you should contact the device manufacturer to see if any optimizations can be made.

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    Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba Networks.
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  • 5.  RE: Wifi latency with android barcode reader

    Posted Oct 22, 2021 09:41 AM
    Thank you Cjoseph !!

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    Michele Romano
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