Hi Don, The LE Peripheral is responsible for setting the appropriate connection interval. The App can not control the connection interval directly. The App can however talk to the LE Peripheral over GATT and ask the Peripheral to request a change to the connection interval. There are some restriction on what connection parameters the iPhone 4S will accept. The rules for connection parameters are detailed in the Apple Bluetooth Guidelines, see https://developer.apple.com/hardwaredrivers/BluetoothDesignGuidelines.pdf Looking at an air trace will probably be the best way to help you get a better understanding of what is going on. Thanks, Joakim On Feb 6, 2012, at 10:10 AM, Don Clark wrote:
I'm puzzled about controlling the BLE connection interval. I'm working with a TI CC2540 key fob device, which has default connection interval and slave latency settings. Using IAR I can modify the project that produces the server app that runs in the key fob, and change the minimum and maximum connection interval values, and the slave latency. But this doesn't seem to be having any impact on my connection and data exchange performance. The Bluetooth 4.0 spec available at the SIG site indicates that the master/host specifies these connection parameters at the connection, and it's then possible for the server/slave to negotiate to change them. According to the Core Bluetooth Framework Reference there is an option argument on the CBCentralManager.connectPeripheral method, but there is no documentation that describes it other than to mention that its "A dictionary to customize the behavior of the connection.". I'm assuming that this is how the caller would specify the initial connection interval and slave latency. The TI documentation points out that "In some cases the central device will request a connection with a peripheral device containing connection parameters that are unfavorable to the peripheral device." This also suggests that the connector (the application connecting to the advertising peripheral node) specifies connection parameters. But I see no way to specify the initial parameters via Core Bluetooth. There is a BLE protocol that allows the peripheral to negotiate connection parameters that are more to its liking. I haven't looked in a packet trace yet to see if the negotiation is going on, will do that soon. But I'm still wondering about how to control this, as much as I can, through Core Bluetooth.
Thanks
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