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Re: ANCS constantly re-sending notifications?

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Re: ANCS constantly re-sending notifications?

Subject: Re: ANCS constantly re-sending notifications?
From: Martijn The <email@hidden>
Date: Wed, 28 Oct 2015 11:16:54 +0100

I've also seen this happen recently. I'm not sure why either.

Hopefully someone from Apple can shed some light on this.

Martijn

Pebble Time - Awesome Smartwatch, No Compromises

http://www.pebble.com/

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On Tue, Oct 27, 2015 at 10:32 PM, Clem Taylor <email@hidden> wrote:

I'm working on completing the firmware for a peripheral that is using
ANCS. I'm trying to tune the power consumption by dynamically changing
connection interval. Longish interval when nothing is going on and
dropping the interval back down when a new notification arrives.

In adding support for this I noticed that iOS 9.0.x and 9.1 seem to be
constantly re-sending all the active notifications periodically as
'added' events (would have expected 'modified' if something changed).
The only thing that seems to change is the the 'pre-existing' flag is
set on the re-transmitted notifications. This is not the result of a
disconnect/reconnect, the connection is established the entire time.
The period between re-sends is ~30s, ~60s, ~90s, ~180s, ~240s (it
might be backing off, not sure).

Any ideas what this is for? It results in needless traffic and wastes
power on both sides (especially for a device with a tiny battery). I
don't remember seeing this behavior pre-9.x. Is there something I'm
doing wrong that is causing iOS to re-transmit?

Many thanks,
Clem
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References:
	>ANCS constantly re-sending notifications? (From: Clem Taylor <email@hidden>)

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