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  • Case ID: 297655
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Extend ble acl on LE Audio headset

Gerry

Hi Nordic team

We work on a custom hardware (LE Audio headset) and we need to send the battery voltage of the headset to the gateway which will be a smartphone. Using nRF Connect, I can see the BLE ACL (Volume control etc.). Can someone help me to implement a custom property like battery voltage?

kind regards

Gerry

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  • +1

    Hello Gerry,

    Thank you for your patience with this.

    We work on a custom hardware (LE Audio headset) and we need to send the battery voltage of the headset to the gateway which will be a smartphone. Using nRF Connect, I can see the BLE ACL (Volume control etc.). Can someone help me to implement a custom property like battery voltage?

    You should be fine to add 'regular' BLE communication alongside the LE Audio communication. We have internally tested 2 ACLs with 1 CIS each, for volume control etc, and you should be able to use these just as well to transfer your battery level or similar.

    Some considerations however:
    1. Make sure that the Connection interval is at least 4 times larger than the ISO interval, and has a common denominator with the ISO interval.
    2. Make sure that you finish all link layer negotiations (connection parameter updates, etc) before establishing the ISO channel - we have seen a few instances were multiple LL negotiations during regular CIS operation could cause a link instability, if you are unlucky. We are working on resolving this, but the current recommendation is to avoid these operations after the ISO channel is established.

    Best regards,
    Karl

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  • +1

    Hello Gerry,

    Thank you for your patience with this.

    We work on a custom hardware (LE Audio headset) and we need to send the battery voltage of the headset to the gateway which will be a smartphone. Using nRF Connect, I can see the BLE ACL (Volume control etc.). Can someone help me to implement a custom property like battery voltage?

    You should be fine to add 'regular' BLE communication alongside the LE Audio communication. We have internally tested 2 ACLs with 1 CIS each, for volume control etc, and you should be able to use these just as well to transfer your battery level or similar.

    Some considerations however:
    1. Make sure that the Connection interval is at least 4 times larger than the ISO interval, and has a common denominator with the ISO interval.
    2. Make sure that you finish all link layer negotiations (connection parameter updates, etc) before establishing the ISO channel - we have seen a few instances were multiple LL negotiations during regular CIS operation could cause a link instability, if you are unlucky. We are working on resolving this, but the current recommendation is to avoid these operations after the ISO channel is established.

    Best regards,
    Karl

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