Cherry pick of Bluetooth controller peripheral conn update fix#51
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Cherry pick of Bluetooth controller peripheral conn update fix#51carrefinho wants to merge 1 commit into
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Fix peripheral role assertion during connection update and simultaneous flash operations. prepare_cb: Actual EVENT_OVERHEAD_START_US = 6149 This happens due to instant latency at connection update where the ticks_at_expire was in the past. Signed-off-by: Vinayak Kariappa Chettimada <vich@nordicsemi.no>
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Add conn_subrate_transitions: the peripheral negotiates factor 4, the central re-negotiates to factor 8 (a true M->N transition, central- initiated 5.1.19), and the central verifies both sides re-skip at 8 via timed reads. It then changes the connection interval while subrated and verifies subrating resets to factor 1 (low read latency) and the link survives -- exercising the steady-state gate (both present every event during the procedure) and the zmkfirmware#51 latency_upd fix. No controller changes: the gate already handles M->N transitions and the conn-update instant; this validates that behavior. central.c / peripheral.c refactored to share connect/probe helpers across the two scenarios; new run script + CI step. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Cherry-picks fix for peripheral assertion crash during BLE connection parameter updates from upstream Zephyr.
This is needed for the split idle interval feature (zmkfirmware/zmk#3182) which updates connection parameters when idle.