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kIOBluetoothDeviceResetError
A controller reset invalidated the in-flight operation context
kIOBluetoothDeviceResetError is an IOBluetooth return value whose AllStat entry says that a device reset interrupted a pending operation. The important boundary is the reset: host-side state for commands, connections, discovery, and queued I/O may no longer describe the controller's current state.
This is not the same as an ATT error from a peripheral. It occurs at the macOS Bluetooth controller layer, before an application can safely reason from the earlier operation's expected completion. A reset can also be part of HCI transport recovery when the host and controller lose synchronization.
What to check
- Record the controller identity, operation type, pending command or connection state, reset or hardware event timing, and any sleep/wake or USB transport transition.
- After the controller is usable again, re-enumerate or revalidate the controller and connection state before continuing GATT, RFCOMM, or other higher-layer work.
- Replay only operations whose protocol semantics make replay safe; a reset result alone does not prove whether the peer observed an earlier command.
References
- Bluetooth SIG: Host Controller Interface functional specification
- Bluetooth SIG: HCI UART error recovery and reset
- Apple: IOBluetoothHostController
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