which param is best for fast connection to Android?

[seki]

I'm looking best settings of fast connection to Android4.3

The time of advertise start to connection established average is about 7s I think it is too slowly, may be My connection parameter is bad

what should I set connection parameter for fast connection?

ADV_INTERVAL 125ms MIN_CONN_INTERVAL 50ms MAX_CONN_INTERVAL 1s SLAVE_LATENCY 3

NRF51822 - Nexus7(Android4.3)

please help.

[Hung Bui]

Hi Seki, I handled your question in the support portal. I just copied it here for reference, in case it would be useful for others.

Your advertising interval and connection interval is quite high. It may cause the connecting time longer.

If you can set the advertising interval lower (minimum by spec is 20ms).

However, doing so will make the current consumption higher. You can implement a timeout for the fast advertising, let say when active the advertising interval stays at 20ms, after 2 minutes of inactivity, you can change the adv interval to 100-300 ms.

Depend on the FIRST_CONN_PARAMS_UPDATE_DELAYin your setting, you can request the master to change the connection interval to lower value, the minium conneciton interval is 7.5ms and it is supported by Android device (but not on iOS).

The long connecting time maybe the result of other factors. Please have a try on reducing the adv interval and conninterval.