android 4.3 Galaxy S4 connection disconnect automatically

[linkQ]

I was using nRF Master Controller app on Samsung S4 to connect to my Ble device. However, after connected a while, the device will be disconnected automatically while I was doing nothing just putting the phone and the device aside.

[Hung Bui]

Hi LinkQ,

Which Android version does your S4 have ? On Andorid 4.3, the minimum connection interval that S4 accepts is 37.5ms. If you have your prefered connection parameter that have minimum connection interval <30ms and/or max connection interval <40ms, the connection paramater request from the nRF51822 will be rejected by the phone.

After 3 requests without success, the nRF51822 will automatically disconnect.

[linkQ]

Thank you very much for your reply. I am using S4 with android 4.3. I will modify the connection interval later to see if it will work. I think this is where the problem is.