Apple

etan,

still, there should be some "legal" setting of the parameters to at least obtain the default rate used by the phone -- when no parameters are sent.... again, the phone secures a 29ms connection at the beginning of a connection -- subject to change only if an update request is received....

from my reading of the guidelines, the smallest connection interval parameters would be: 20ms (min); 40ms (max).... when i send these parameters, the result is a 37ms connection interval.... clearly, there must (should??) be a set of parameters that would yield the default 29ms interval.... said another way, the phone can clearly operate at the 29ms rate; but we have no way to programmatically request that rate at runtime....

bob.

On 3/13/2013 10:25 AM, Etan Kissling wrote:

Bob,

You should only count on the guidelines. The rest can (and did) change in the past.

Also, there is a range of issues that occurs more often when using out-of-bounds parameters. For example, you will encounter more Bluetooth stack resets if streaming too fast or if maintaining too many concurrent connections.

Etan

On 13.03.2013, at 15:01, "Bob Frankel" <email@hidden> wrote:

hi,

i'm running ios 6.1.2 on my iphone and recently noticed that the default connection interval -- assuming i don't request a parameter update from my peripheral -- is 29ms according to my packet sniffer; in the past, this value was in the 100ms range....

experimenting a little, i found that i could send a parameter update request with a minimum connection interval of (8 * 1.25ms) and a maximum connection interval of (16 * 1.25) and the iphone would *accept* this request and change the connection interval to 18ms (15 * 1.25)....    isn't this outside of the apple bluetooth guidelines, which require a minimum connection interval of 20 ms (16 * 1.25ms)????
note that requests for shorter intervals were rejected....

is this a fluke, or is this behavior something we can count on....

bob.

Bob Frankel, CTO
Emmoco, Inc | Embedded Mobile Control
c:  +1-805-680-0112
e:  email@hidden

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Emmoco, Inc | Embedded Mobile Control
c: +1-805-680-0112
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References:
	>fastest connection interval (From: Bob Frankel <email@hidden>)
	>Re: fastest connection interval (From: Etan Kissling <email@hidden>)