While I was searching how to find Bluetooth HCI event code meaning, I found the link below. Raspberry Pi Bluetooth HCI Event Code Meaning

In this post, Section 7.8 Part E, Vol 4 and Section 7.7.14, Part E Vol 4 are mentioned. But I still don't know which document include this sections. I downloaded Core_v5.4.pdf but it does not have those sections.

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It is not the easiest document to read, but those sections do appear to be in there. I downloaded it from https://www.bluetooth.com/specifications/specs/core-specification-5-4/

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