HRESULT 0x80650006 (E_BLUETOOTH_ATT_REQUEST_NOT

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Description:

The remote ATT server does not implement the requested protocol procedure.

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E_BLUETOOTH_ATT_INSUFFICIENT_AUTHENTICATION	E_BLUETOOTH_ATT_INVALID_OFFSET

E_BLUETOOTH_ATT_REQUEST_NOT_SUPPORTED

The requested ATT procedure is outside the server capability

E_BLUETOOTH_ATT_REQUEST_NOT_SUPPORTED carries ATT error 0x06. It is returned for a recognized request that the server does not support, rather than for an unknown attribute or malformed PDU. An older stack may omit an optional procedure, or a constrained peripheral may implement only the subset required by its profile.

Fallback must preserve semantics. Replacing Read Multiple Variable with separate reads can be valid, while replacing a reliable queued write with independent writes can break atomicity. The client should select an alternative only when the profile and data consistency requirements allow it.

Useful compatibility checks

Identify the exact ATT opcode rejected by the server.
Check whether the procedure is mandatory for the claimed Bluetooth and profile version.
Use a simpler standardized procedure only when it produces equivalent results.
Avoid treating the error as transient; firmware support normally does not appear after retrying.

References

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