📡 Synchronization of timestamps, using Bluetooth Connection Event?
📡 Synchronization of timestamps, using Bluetooth Connection Event?
- Subject: 📡 Synchronization of timestamps, using Bluetooth Connection Event?
- From: Julian Vogels <email@hidden>
- Date: Tue, 12 Feb 2019 12:25:54 +0100
Dear list,
Thank you for interesting topics and your support in the past.
We’re building a peripheral device (Nordic nRF52840) which needs to be time
synchronized with the central device (iOS device) once on connection.
When sending a timestamp, we have unknown, noticeable latency. This is because
we cannot know the time it takes until one packet is processed on the central
side, sent, and then received and processed on the peripheral side. However, we
do know that there are Connection Events (CEs) occurring every Connection
Interval (30 ms), where the packets are exchanged. We were planning on using
the CEs to infer the actual time of send/receive, as the event is happening at
the same time on both sides and has a very short duration.
On the peripheral device, we are able to generate an interrupt when the CE
occurs. On the iOS device, we are unable to detect when a Connection Event is
occurring.
Is there any way to get the synchronized Bluetooth clock tick (Connection
Event) on iOS? Or maybe we’re on the wrong track altogether?
Any other ideas on how do you synchronize two timestamps on peripheral and
central device? (We already have clock drift compensation by the way, I am just
asking about timestamp sync.)
Our requirement is a latency/jitter under 5-8 ms.
I hope I sparked someones interest in this engineering problem! Please send me
a message if anything is unclear.
All the best,
Julian
<http://www.soundbrenner.com/> Julian Vogels
CTO & Co-Founder
+49 176 5659 1152 (GER) | Skype: julian.vogels | WeChat: julianvogels
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