https://devzone.nordicsemi.com/f/nordic-q-a/75248/mqtt-max-speedHello I need to broadcast large amount of data on MQTT ~ 300K I require to send it as fast as possible how can I best calibrate settings for maximal speed send via MQTT? how can I test speed limit to the maximum? are there any relevant ATen-USTelligent Community 13Wed, 19 May 2021 14:44:52 GMThttps://devzone.nordicsemi.com/thread/310528?ContentTypeID=1Wed, 19 May 2021 14:44:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5313f787-7677-4806-8001-40235e397344Heidi<p>Hi!</p> <p></p> <p></p> <p>Here are the relevant limitations with regard LTE-M and NB-IoT.</p> <p></p> <table height="54" width="321"> <tbody> <tr> <td></td> <td>LTE Cat M2</td> <td>LTE Cat NB2</td> </tr> <tr> <td> <p>Downlink Peak Rate</p> </td> <td>~ 4 Mbit/s</td> <td>127 kbit/s</td> </tr> <tr> <td>Uplink Peak Rate</td> <td>~ 7 Mbit/s</td> <td>159 kbit/s</td> </tr> </tbody> </table> <p>Source: <a href="https://en.wikipedia.org/wiki/Narrowband_IoT#3GPP_LPWAN_standards">Wikipedia&nbsp;</a></p> <p></p> <p>We don&#39;t have any modem-specific AT commands to test this, but the <a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/applications/serial_lte_modem/README.html">Serial LTE Modem application</a> has some <a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/applications/serial_lte_modem/doc/MQTT_AT_commands.html">MQTT-related proprietary AT commands</a>.</p> <p>But if you want to try posting as often as possible to test the maximum amount you should really write a small application that does this. The <a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/nrf/samples/nrf9160/mqtt_simple/README.html">Simple MQTT sample</a>&nbsp;is a good starting point here.</p><div style="clear:both;"></div>