Switching BLE connection parameters when moving to background
Switching BLE connection parameters when moving to background
- Subject: Switching BLE connection parameters when moving to background
- From: Peter Skinner <email@hidden>
- Date: Sat, 10 Mar 2012 01:42:57 -0500
| Hello,
Our BLE accessory is only used when an app is active. It makes a lot of sense to put it in a lower power state when the app moves to the background
Our app sends a message to the accessory when it is time to switch connection parameters. The accessory then makes a standardL2CAP Connection Parameter Update Request for a longer connection interval.
I can see using a sniffer that iOS 5.1 immediately accepts the connection parameter update request, and sends the LL_Connect_Update_Req with the new interval, but the 'Instant' it chooses to make the switch (the connEventCount) can be fairly far in the future.
As a result, when switching back to the app, I will typically see a delay of about 10 seconds before the accessory has switched back to a faster connection and becomes usable. That's too long for a user to wait, so I'm working on disconnecting/reconnecting the accessory instead to see if that's faster.
Does this sound about right? Are there any guidelines that will allow these connection update transactions to happen faster?
Thanks,
Peter Skinner
Ten One Design 201-965-0200
|
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