Apple

From: Zach Dennis <email@hidden>
Reply-To: "email@hidden" <email@hidden>
Date: Tuesday, May 20, 2014 at 2:24 PM
To: William Henderson <email@hidden>
Cc: "email@hidden" <email@hidden>, Fred Visticot <email@hidden>
Subject: Re: Avoiding to discover services and characteristics with iOS7

On Mon, May 19, 2014 at 10:37 PM, William Henderson <email@hidden> wrote:

If I recall correctly, caching is used (automatically, as Jason said) only for paired devices who haven’t changed (any of) their advertised characteristics or services.

Experimentally this doesn't seem to true. If keep the same advertiser's address but change everything else about the advertising device then iOS will use cached data in some places (like the local name) and you have to either clear the bluetooth cache or wait a few minutes (I'm not sure if it's time based on a # of advertisement threshold before iOS kills the cache in certain instances).

Zach

William

On Monday, May 19, 2014 at 3:55 PM, Jason Conn wrote:

- Can I save a characteristic and use this property without services and characteristics discovering step ?

No. CBService/Characteristics/Descriptors are only valid within the context of the connection in which they were discovered.

You need to go through the same steps and the cache will be used where appropriate.

On May 19, 2014, at 3:51 PM, Fred Visticot <email@hidden> wrote:

I know that iOS7 has introduced caching mechanisms in the CoreBluetooth.

1. I reconnect to a previous connected device with the peripheral identifier.

2. Connection is fast (100ms)

3. I need to read a characteristic value

- Is it mandatory to discover services and characteristics before reading a value ?

In my case it takes 1.5s to read the value ?

- Can I save a characteristic and use this property without services and characteristics discovering step ?

Is the iOS7 caching mechanism « transparent » / « free » meaning that discovering services and characteristics is using cache ?

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