real time from bluetooth

[psimon]

just seeing if anyone has done this, or knows it is/not feasible.

run a bluetooth time server app on a phone and have the rpi3 set its time from it.

[psimon]

apparently low energy actually just has this service, at a low level.

https://developer.bluetooth.org/gatt/se ... t_time.xml

[Douglas6]

Yup, that's a standard GATT profile. I am not aware, and doubtful of, any Linux package to automatically update system time with that information. You'll probably have to roll your own.

[psimon]

i have found a project to expose GATT service/profile/functionality, one of their examples is a time server/client.

but confused as to why you need a server, i thought the server would just 'be there' on a BTLE device, because its designers realised a time server is best built-in, particularly for the targeted, IOT devices.

[Douglas6]

BLE is all about low energy: don't broadcast unless you need to.

[psimon]

well, i expect this is only as a response to a request, IOT maybe commonly not having a RTC, (thats on all the time, just like a RPi), so no energy extra apart from the, one-off, required response.