https://devzone.nordicsemi.com/f/nordic-q-a/49952/the-communictaion-is-very-low-when-sending-many-packets-using-delayHi I used the SDK 14.2, and download the android source code from guthub. Because I sent many packets(about 100 packets), so the delay should be set in the Android. I tried from 5ms ~ 20ms, and 20ms is ok and none packet lost. If I used 20ms delay,en-USTelligent Community 13Tue, 23 Jul 2019 14:50:38 GMThttps://devzone.nordicsemi.com/thread/200122?ContentTypeID=1Tue, 23 Jul 2019 14:50:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4e17b1cc-b1de-427c-84a2-fece179f184dtesc<p>Hi,</p> <p>You have provided too little information for us to be able to tell what is happening.</p> <p>What is the &quot;android source code&quot; that you downloaded from Github? There are many source code projects for Android on github, both from us and from others.</p> <p>What is the nRF5 SDK v14.2 project? A modified or unmodified example? (Which one?) What characteristic are you writing to?</p> <p>What are the BLE roles of the device and of the smartphone running the android application? (Which one is peripheral, and which one is central?)</p> <p>What are the connection parameters that you get for the connection? (Connection parameters are decided by the central. Settings on the peripheral side is just a suggestion, which the central can choose to ignore if it wants to.)</p> <p>Regards,<br />Terje</p><div style="clear:both;"></div>