https://devzone.nordicsemi.com/f/nordic-q-a/63080/file-transfer-speed-from-ios-iphone-x-to-nrf52840Hello everyone, In the past few days I have been struggling with the following issue: I have a file on my iPhone, I want to send it to the NRF52840 using BLE (the softdevice). I had a look at the Image Transfer demo app, which although not workingen-USTelligent Community 13Mon, 29 Jun 2020 11:47:29 GMThttps://devzone.nordicsemi.com/thread/257354?ContentTypeID=1Mon, 29 Jun 2020 11:47:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:826071f0-1af0-4cb9-ada2-0dbf84f2d109ovrebekk<p>Hi</p> <p>A couple of follow up questions:</p> <p>1) Have you checked the length of the packets received on the nRF52 side to verify that the 185 byte MTU size is actually used?</p> <p>2) Have you checked how often packets are sent to see if you are able to send more than one packet pr connection interval?</p> <p>3) Have you made sure to use write commands (write without response) rather than write requests to ensure that you don&#39;t get slowed down by having to wait for the write responses from the nRF52?</p> <p>Best regards<br />Torbjørn</p><div style="clear:both;"></div>