IPhone 5s BLE updata rate
This is a copy of a post I just put on TI's E2E forum...
I just got an iPhone 5s so I could test compatibility with a custom app/custom BLE circuit...
Note: after fixing some iOS7 issues, everything works fine on ALL BLE capable iPad and iPhone devices from Apple.
Again, all devices (except iPhone 5s) work with iOS5, iOS6 and iOS7. (just to be completely accurate, iPhone 5 and iPad 4 and mini's were not tested with iOS5)
My apps are using multiple BLE devices connected simultaneously.
When testing with the new iPhone 5s (note also that I tested with a second iPhone 5s just to make sure it was not my phone specific), the sampled data seemed to be rather "sluggish" and in fact would continue to be collected by the iPhone 5s even after the input from the transmitting devices ceased. (apparently caching)
Another note: with 3 devices transmitting simultaneously, I can capture sample rates up to 50 samples/sec for each transmitting device with the iPhone 5 and the iPad 4, and when I increase the sample rate on the transmitting devices (tested up to 1000 samples/sec) the iOS devices "topped out" at appx 50 samples/sec which is currently acceptable for my current application so I set the BLE transmitting devices to 50 samples/sec to conserve battery life. The indicators on the app which are affected by the sample rate are responsive an (snappy) as the data changes and when sending more than 50 samples/sec, the "extra" data is apparently being disregarded (dropped) as the "real time" indicators are using the most recently transmitted data with no apparent "caching".
Note: apps were compiled with xcode5 in both iOS6 and iOS7 - no difference in testing.
When testing with only one device, transmitting at 50 samp/sec, if I continue transmitting long enough, I can get the BLE connection to fail (over running a buffer?). I have to lower the transmission rate down to 20 samples/sec or lower to let the iPhone 5s "keep up". this is rather disappointing as the iPhone 5s (64 bit) is supposed to be so much faster and I fear that the new iPad to be announced this month may have the same issues if it follows the iPhone 5s architecture.
I downloaded the current iOS keyfob app from TI's wiki (remember to change type:CBCharacteristicWriteWithoutResponse]; to type:CBCharacteristicWriteWithResponse];), and got 2 of my TI keyfobs and programmed them with the latest "keyfob" code (BLE-CC254x-1.3.2 stack), one with no changes (ACCEL_READ_PERIOD 50) 20 samples/sec, and the other one changed to (ACCEL_READ_PERIOD 20) 50 samples/sec. - you can even change to a faster sample rate to see a more dramatic depiction of what I'm describing.
Connect each of the keyfobs in turn and shake them and watch the "bars" and you can see the "delayed" reaction - (cached). The 20 samples/second keyfob is more responsive but you can still see a small amount of delay even down to 20 samples/sec.
I also got out 2 of my "SensorTags" and repeated the same tests with the same results just to see if there was something in the older keyfob code that might be causing this vs. the newer styled coding the SensorTags utilize, but again, the results are the same which points me back the the iPhone 5s.
I can't find anything from Apple's side about the way the 5s may be different but it appears that the 5s caches BLE data and all the rest of Apple's previous devices apparently do not. Also, I could not find anything in the iOS or xcode side that gives any options for turning caching on or off (if that is indeed what is really happening), but even if that were the case, the exact same code (iOS) can be run on all devices with only the 5s being different.
Any thoughts out there?
I think that this should be important to anyone out there who plans on collecting "real time" data and wants to be able to support the latest hardware...
I'd be happy to give more detail on any of the tests I've done if you are unable to replicate this.
Thanks,
evw
I just got the iPad Air and can confirm that it behaves identical to the iPhone 5s as described above...
Is anyone out there concerned about this?
I've submitted bug reports, informed DTS, and posted to TI's E2E, but still nothing...
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PROBLEM
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Thanks!
Alan Vrana
System engineer
SCADA Projekt d.o.o.
Picmanova 2
10000 ZAGREB
CROATIA
T +385 1 6622230
F +385 1 6683463
e-mail [email protected]
Alan Vrana
SCADA Projekt d.o.o.
ZAGREB, Croatia
Attachments:
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http://digital.ni.com/public.nsf/allkb/F70DB3441DC5AB9986256E97005BA825
http://zone.ni.com/devzone/cda/tut/p/id/6107
http://zone.ni.com/devzone/cda/epd/p/id/5505
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Preston Johnson
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[email protected]
www.ni.com/mcm
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