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STATUS_BTH_ATT_INVALID_HANDLE
The server could not resolve the requested attribute handle
STATUS_BTH_ATT_INVALID_HANDLE is the Windows NTSTATUS form of ATT error 0x01. ATT uses a 16-bit handle to address a specific attribute; the error says that the request cannot be applied to that handle in the peer's current attribute database.
This is different from a permission failure. The server did not reject a valid attribute because of read, write, pairing, or authorization rules; it rejected the address itself. Cached handle values are a common diagnostic lead when the peripheral firmware, service layout, or connection state has changed.
What to check
- Record the ATT request opcode, the handle sent, the device address, the service and characteristic UUID expected by the client, and whether discovery was performed on this connection.
- Re-run service and characteristic discovery before substituting another handle. A nearby numeric handle is not evidence that it names the same attribute.
- For a device whose GATT database can change, make cache invalidation and service-change handling part of the client design rather than retrying the old request indefinitely.
References
- Bluetooth SIG: Attribute Protocol (ATT)
- Bluetooth SIG: Generic Attribute Profile (GATT)
- Microsoft: Bluetooth GATT client
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