cannot scan ble device after awhile

[lydie]

as soon as I built and run my firmware program on SES ARM 4.22, RF connect scanner can find the ble device (NRF52832). But after 10 seconds later, i do rescan in RF Connect, it become disappear.

I cannot find it out the reason. Can anyone suggest me on that?

a million thanks.

[Joakim Jakobsen]

Hi! 

Could be many different reasons that the device is no longer detected by nRF Connect. 

What FW are you running on the nRF52832? How long does your device advertise, i.e what are the advertising timeout? 
Are you sure that the device is in range with nRF Connect?

Best regards, 
Joakim

[lydie]

Hi,

I'm using st7735. APP_ADV_DURATION is 1000, so I tried to increase it to 10000. The disappearance time is longer, but it still becomes disappear. Do you know if I can make this parameter unlimited to have a stable connection?

Thanks for your response.

[Joakim Jakobsen]

Hi. 

The APP_ADV_DURATION is the the advertising duration in units of 10 milliseconds.
So using APP_ADV_DURATION = 1000 will have the device stop advertising after 10 seconds, as expected.

Setting the APP_ADV_DURATION to 0 should make your device advertise indefinitely. 

Best regards, 
Joakim Jakobsen