NTSTATUS 0xC0420002 (STATUS_BTH_ATT_READ_NOT

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Description:

the target attribute does not permit ATT reads.

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STATUS_BTH_ATT_INVALID_HANDLE	STATUS_BTH_ATT_WRITE_NOT_PERMITTED

STATUS_BTH_ATT_READ_NOT_PERMITTED

A valid attribute was addressed, but reading is not an allowed operation

STATUS_BTH_ATT_READ_NOT_PERMITTED represents ATT error 0x02. It is returned when the attribute can be located but its access permissions do not allow the requested read operation.

That distinction matters: an application can discover a characteristic or descriptor and still be unable to read its value. Pairing again does not turn a write-only or server-only attribute into a readable one; this status is separate from the ATT security errors for authentication, authorization, encryption, and key size.

What to check

Keep the service UUID, characteristic or descriptor UUID, handle, requested ATT opcode, and advertised characteristic properties together in the diagnostic record.
Confirm that the client selected the intended value handle rather than a declaration or descriptor handle.
Use a read procedure only when the published profile permits it; do not probe repeatedly in the hope that a protocol permission changes.

References

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