https://devzone.nordicsemi.com/f/nordic-q-a/77872/serial-lte-modem-master---automatic-data-mode-exit-by-specifying-number-of-bytes-to-be-sentIn NCS v1.6.99 the HEX data format is removed from data send and receive commands (socket, udp/tcp cli/srv), only ascii and data mode is supported. In case of binary data, there is required double silence both before and after the termination commanden-USTelligent Community 13Tue, 27 Jul 2021 08:19:06 GMThttps://devzone.nordicsemi.com/thread/321975?ContentTypeID=1Tue, 27 Jul 2021 08:19:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d41f1ca6-2c89-4d83-b9a9-0316e1293e66Michal M&#252;hlpachr<p>Without data size provided in AT#XSENDTO there is still possibility to wait for explicit data mode exit procedure, so feature will not reduce the functionality, it will juts allow more energy efficient handling.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/321971?ContentTypeID=1Tue, 27 Jul 2021 08:14:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a28b9910-d5d1-4c59-8403-bb89963a2a10Michal M&#252;hlpachr<p>MCU has full control of exiting data mode because size of data is specified.</p> <p>Why would you like to waste energy for battery operated device to spend 2s just to proceed with explicit data mode exit procedure ?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/321945?ContentTypeID=1Tue, 27 Jul 2021 06:52:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1ae405e3-d3a8-40d0-ab7d-dc9440aca700Jun Qing ZOU<p>Hi Michal, we want to give MCU full control of exiting data mode so automatic exiting based on sending size is currently not our intention.</p> <p>Please enable&nbsp;CONFIG_SLM_CUSTOMIZED and implement by your own.</p><div style="clear:both;"></div>