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Subject: Unwanted reduced characteristic update notification rate

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Subject: Unwanted reduced characteristic update notification rate

Subject: Subject: Unwanted reduced characteristic update notification rate
From: Richard Grundy <email@hidden>
Date: Mon, 28 Mar 2016 16:02:07 -0400

Hi Robert,

We had a similar project requirement last year. During my research I found

this rather thorough analysis from someone at the University of Zurich that

proved very helpful. Our implementation followed what's covered in the

deck. We have been able to sustain 7 active connections to BLE devices from

one iPhone (5, 5s, 6, 6s, 6+). Our data rates are much lower than the rates

tested in the slide deck so perhaps that's why we haven't run into any

issues. Your case may be different.

https://www.dropbox.com/s/c6r9xsqisjnfsn5/BLE_Max_Connections_GysinMuellerRuest.pdf?dl=0

best,

Richard

Message: 1
Date: Mon, 28 Mar 2016 05:43:51 -0400
From: Robert Hartman <email@hidden>
To: email@hidden
Subject: Unwanted reduced characteristic update notification rate
Message-ID:
<email@hidden">email@hidden>
Content-Type: text/plain; charset="utf-8"

We have a system with 7 BLE devices as peripherals programmed to send
characteristic update notifications at 10 Hz, with an iOS 9 device as
central receiving them. We often see one or more of the peripherals'
notification rates dropping to a much lesser frequency, down to maybe 1-3
or less Hz. The system is dependent upon the higher frequency, so we're
trying to determine how to prevent the rate drop from occurring. We think
that the drop is caused perhaps by iOS negotiating a longer connection
interval or similar, and we're in the process of setting up a BLE packet
sniffer to verify, and also setting up things on the peripheral side to
indicate a newly negotiated rate. So far we haven't been able to correlate
the rate drop to anything in particular. What can we do to ensure a higher
characteristic update notification rate?
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End of Bluetooth-dev Digest, Vol 13, Issue 34
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Richard Grundy | Founder @ Flomio | +1.954.553.6227 | email@hidden

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