https://devzone.nordicsemi.com/f/nordic-q-a/22517/about-connect-supervision-timeoutI use the SDK9.0，When a bluetooth device and android APP to connect, disconnect the bluetooth device power, why wait for 20 seconds, the APP to detect device has been disconnected.Why do I change my SDK9.0 connection timeout short, still doesn&#39;t worken-USTelligent Community 13Mon, 12 Mar 2018 15:18:03 GMThttps://devzone.nordicsemi.com/thread/123988?ContentTypeID=1Mon, 12 Mar 2018 15:18:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:67e68e67-848d-423c-a4aa-932a08d85b15Yuri Ya<p>In fact the reason is in SDK. If you are going to use SDK9.0 you need to modify&nbsp;is_conn_params_ok() function. This is because it doesn&#39;t check Latency and Timeout which are offered by Android. Look at this function in SDK14 to have an idea how to modify it to force Android to accept parameters you need.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/88586?ContentTypeID=1Fri, 02 Jun 2017 10:41:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:18d2c603-6a9c-47ae-9a53-39b6724899a5Hung Bui<p>You need to check if the actual connection supervision timeout of the connection is set to what you expected or not. This can be verify by either a sniffer trace or by checking the BLE event in the application.</p> <p>Anyway, this is entirely the issue with Android , not from Nordic side. Suggest you to post on Android but report forum.</p><div style="clear:both;"></div>