RE: Fetching RSSI values while synced on a BIS

matthewtap — Sun, 21 Jun 2026 07:31:36 GMT

No, a BIS/BIG sync is not an ACL connection, so there is no connection handle available for the standard HCI Read RSSI command. The RSSI obtained while scanning or synchronized to a periodic advertiser reflects advertising/PA packets, not necessarily the actual BIS audio stream. In most current BLE Audio implementations (including Nordic's), per-BIS RSSI is not exposed to the application, so there is generally no direct way to read RSSI for a BIS stream.

RE: Fetching RSSI values while synced on a BIS

Priyanka — Mon, 15 Jun 2026 14:31:01 GMT

Hi,

For BIS broadcast audio, there is no regular BLE connection, so HCI command to read RSSI is not the right API to use. That API is mainly for normal connected BLE links.

You could maybe use the RSSI from the periodic advertising packets as an estimate of the broadcaster’s signal strength. This can tell roughly how strong the broadcaster is nearby. However, for the actual audio quality, RSSI alone is not enough. The better thing to monitor is whether BIS/ISO audio packets are being received correctly, lost, or received with errors.

-Priyanka