Absolutely insane and fascinating. Here's the core spec: https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=478726 https://www.bluetooth.org/doc

Absolutely insane and fascinating. Here's the core spec: https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=478726 https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?d... [pdf]