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tests: Bluetooth: Tester: Set controller ACL buffer size #89680

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May 9, 2025
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tests: Bluetooth: Tester: Set controller ACL buffer size #89680

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5 changes: 5 additions & 0 deletions tests/bluetooth/tester/overlay-bt_ll_sw_split.conf
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Original file line number Diff line number Diff line change
Expand Up @@ -67,3 +67,8 @@ CONFIG_BT_CTLR_ISO_TX_BUFFER_SIZE=259
# Set advertising/scan data length to support large BAP BASEs
CONFIG_BT_CTLR_ADV_DATA_LEN_MAX=191
CONFIG_BT_CTLR_SCAN_DATA_LEN_MAX=191

# ACL data sizes
CONFIG_BT_BUF_ACL_TX_SIZE=251
CONFIG_BT_BUF_ACL_RX_SIZE=255
CONFIG_BT_CTLR_DATA_LENGTH_MAX=251
Comment on lines +70 to +74
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May be use of 27 bytes as max ACL data size exposes a bug in the Zephyr Controller? This should be easily reproducible in bsim CI tests with the hci_ipc and nrf52_bsim audio tests with 27 byte ACL configured, right?

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It looks like a bug in the controller, yes, but not sure how to properly determine that yet.

I did try to run the test from #87207 which would also connect the CIS using the same BT Tester build, but at least in BSIM it doesn't seem to fail. Could be due to timing and availability of buffers?