https://devzone.nordicsemi.com/f/nordic-q-a/68693/can-t-connect-to-nrf52840-after-a-few-days-of-advertisingI have a NRF52840 device which advertises connectable every 2 seconds for unlimited time. I&#39;m running a custom service (based mostly on this code https://github.com/NordicPlayground/nRF5x-custom-ble-service-tutorial ). After a day or two some of theen-USTelligent Community 13Wed, 25 Nov 2020 19:02:35 GMThttps://devzone.nordicsemi.com/thread/281907?ContentTypeID=1Wed, 25 Nov 2020 19:02:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b2978682-036b-43d3-84f8-7bb6af251c5briataman<p>I tracked this down to the following:</p> <p>I had a inactivity app_timer that started at 15 minutes when someone connected to the device. I tracked the issue to this timer triggering immediately on start (on connection) .</p> <p>I found a bunch of people with the same problem on this forum and I fixed it by having a repeated timer constantly running to work around this app_timer bug.</p> <p></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/281586?ContentTypeID=1Tue, 24 Nov 2020 13:45:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:de456bd8-1b77-44dd-a2be-4264bbde4facHung Bui<p>Hi Rataman,</p> <p>The tutorial is pretty old. I would suggest to have a look at our ble_app_uart example as the reference code for developing custom service.&nbsp;</p> <p>What I can find in the sniffer trace is that the nrf52840 device request a connection termination right after a few packets after the connection established with the code: Remote user terminated connection (0x13).<br /><br />I don&#39;t know why it did that. Could be that in your code you have a call to softdevice API to disconnect the connection.&nbsp;</p> <p>Please try testing on the ble_app_uart and check if you get the same issue.&nbsp;</p><div style="clear:both;"></div>