how can I check ble connection

how can I check ble connectionhttps://devzone.nordicsemi.com/f/nordic-q-a/53915/how-can-i-check-ble-connectionHi, I am now studying on the basis of advertising tutorial example. When I connect to the device, I want to turn on the led4 in the main loop(To just study), but I don't know how can check connection. (It has nothing to do with led1) I'd appreciateen-USTelligent Community 13Fri, 01 Nov 2019 08:53:12 GMTRE: how can I check ble connectionhttps://devzone.nordicsemi.com/thread/217899?ContentTypeID=1Fri, 01 Nov 2019 08:53:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:71f31947-7ede-4586-8214-d59d80a519e5MAHI<p>Hi Rita,</p> <p>Nordic has designed the SDK like this when the ble device is advertising the led1 blinks and when the connection is done between 2 ble devices led1 stops blinking and please mention the what services are u using and check where the leds_init is done and modify it. Hope it will help.</p><div style="clear:both;"></div>