Strange problem, update connection interval from cc2540 always fail

Jun Feng Hu

I have been trying to use the L2CAP Connection Parameter to change the Bluetooth 4.0 (BLE stack) Connection Interval in iOS 6.1.x. The 30ms default causes my device to consume too much power. I've followed the Bluetooth Accessory Design Guidelines for Apple Products and used the following setting:

Preferred Timeout: 6seconds
Preferred Minimum Interval: 800ms

Preferred Maximum Interval: 1000ms
Preferred Slave Latency: 0ms.

but everytime after updating, iphone5 will lose connection with my device.

and next time i try again, iphone5 will lose connection again.

but i think i fullly comply with Apple rule as above.

So why i can't update interval, please help me to solve this problem, thanks.

over 13 years ago

0 Aslak N. over 13 years ago

TI__Mastermind 23440 points

Hi Jun,

It may be that you need to wait 5 seconds after connection establishment to update the conn params. This is a recommended value in the core spec addendum that it seems iOS has implemented. Try this and see if it works.

Best regards,
Aslak

0 Jun Feng Hu over 13 years ago in reply to Aslak N.

Prodigy 230 points

i wait 10 seconds after connection establishment and i failed again.

So any other advice?

0 Aslak N. over 13 years ago in reply to Jun Feng Hu

TI__Mastermind 23440 points

Not really. If you use the SmartRF packet sniffer, what is the response from the iOS device?

Try some other parameters and see if that works better? Higher or lower supervision timeout for instance?

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Strange problem, update connection interval from cc2540 always fail