I have a mac the never sees other air drop devices (although they see each other) and no devices can see it. The machine is MBP Retina. Continuity is working on it: you can switch to the app that you are using on an iphone and vise-versa.
This mac arrived with Yosemite and this issue persisted in El Capitan. I've done all the instructions that can be found on different resources like checking firewall, setting discoverable option to Everyone, deleting plists, disabling enabling iCloud.
Now let's be professional. How can I see any information about air drop? Can I invoke anything from Terminal? Are there any system logs about air drop?