bluetooth GATT questions

[wilsonjw]

Thank you, @danielt .

Following a link in the doc you mentioned, I found this list of UUIDs. That must make it easy for companion app (GadgetBridge, etc.) developers if everyone sticks to the standards when declaring their services. Sure enough:

• UUID 1805 is the Current Time Service, which is defined in CurrentTimeService.h. 
  
• UUID 2a2b (handle 19 that I referred to earlier) is the current time characteristic, which is also defined in CurrentTimeService.h
  
• UUID 2800 (handle 17) is a service declaration (?), I found a definition for it in one of the nimble headers
  
• UUID 2803 (handle 18) is a GATT characteristic declaration (?), I found that also in a nimble header.
  

So I guess InfiniTime has implemented only one of the three characteristics you mentioned (uuid 2a2b) and the other three are just part of the GATT protocol? I found a book chapter about GATT that I think will clear it up.