Quick connection parameters update

[Ziran]

Hello everyone,

I'm currently trying to change the connection parameters to be quick(100ms 0 slave latency) on a button press and after a timer timeout I go back to the low connection parameters.

I'm also sending a notification to an android application at the same time and then send back 2 characteristic ( LED toggle and a string for a LCD) .

It's working but it take quite a long time (10s) for my application to change the connection parameters so the 2 characteristic are not sent at quick connection parameters the first time but if I press a second time it's then updated and send it quickly.

Do you guys know a workaround this problem ?

[Knut Eldhuset]

Hi,

The Bluetooth spec says that the master should allow a minimum of 6 connection events before the new connection parameters are applied. This could easily amount to 10s, depending on the old connection interval.

You could try using a short connection interval and increasing slave latency to send the notifications more quickly. This would also conserve power.

BR

[Ziran]

Ok I fell like i'm on the right path ! So I'm still doing the connection parameter update because I really need a good reponse of the device from the smartphone. So my problem now is that the change seems to work only once( the first time I click on the button) then no response .

I got that [13:41:29.1] Received Connection Parameter Update Request [13:41:29.1] ConnectionParameterUpdateResponse sent with ACCEPTED response [13:41:29.1] Connection Parameters Update sent. ConnInterval:100.0ms, SlaveLatency:0, SupervisionTimeout:4000.0ms [13:41:29.5] Received a HandleValueNotification on handle 000E with value 01 [13:41:35.2] Received Connection Parameter Update Request [13:41:35.2] ConnectionParameterUpdateResponse sent with ACCEPTED response [13:41:35.2] Connection Parameters Update sent. ConnInterval:200.0ms, SlaveLatency:5, SupervisionTimeout:10000.0ms [13:41:38.7] Received Connection Parameter Update Request [13:41:38.7] ConnectionParameterUpdateResponse sent with ACCEPTED respons