Re: Multiple packets per connection event with multiple peripherals connected to iOS central
Re: Multiple packets per connection event with multiple peripherals connected to iOS central
- Subject: Re: Multiple packets per connection event with multiple peripherals connected to iOS central
- From: Etan Kissling <email@hidden>
- Date: Mon, 14 Jul 2014 09:56:28 +0000
- Thread-topic: Multiple packets per connection event with multiple peripherals connected to iOS central
The only way to send multiple packets during a single connection event is by using notifications or writes without response.
Both of these mechanisms should not be used for reliable transfer, as the Bluetooth specification clearly explains that such packets may be discarded at any point.
Here are some german/(parts in english) slides that show recent measurements on BLE throughput with multiple concurrent connections. http://www.embeddedcomputingconference.ch/pdf_2014/2B1_GysinMuellerRuest.pdf
On 03.07.2014, at 18:45, Mark Gill <email@hidden> wrote:
> Hello,
>
> I am connecting 4 to 9 CC2540 peripheral devices to an iPad 2. The CC2540 devices are configured to send multiple packets during a single connection event (between 2 and 4 packets). I have used connection intervals ranging from 10 mS to 50 mS. When using a single peripheral, I have had success sending multiple packets from the peripheral to the iPad. When I connect more than 3 peripherals, the iPad will only receive the first packet from the additional sensors. Thanks for any clues you may have to fix this issue.
>
> Best,
> Mark Gill
> Research Assistant
> University of Miami
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