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Where can I find a list of BLE event codes?

For example, I get logs like this, and I want to know what these events are:

ble_cts_c: BLE event handler called with event 0x57

I also see 0x36, 0x12, etc. when the CTS is operating.

This post did not point to a list of numbers & corresponding event types. 

I know that Bluetooth status codes are here and error codes in general are here, from this post.

This post pointed to a list of EVT enums and bases, which is the closest to answering this Q I have seen, but I am not clear how you can take say, 0x57 and know which enums / base codes are added together to get this 0x57. And maybe adding isn't even the right operation here. 

In short -- if I know the event code the BLE event handler is called with, how can I translate that number into the actual event that occurred, so I know what events are happening?