https://devzone.nordicsemi.com/f/nordic-q-a/63064/nrf52840-dk-sending-twice-the-message-if-the-payload-is-under-10-bytesHi community ! I create a model to send a string over mesh and it&#39;s working well ! The only thing which is strange is when my string is 9 bytes long (or under), the message will be send twice and when it&#39;s 10 or 121 bytes long, the message is sendingen-USTelligent Community 13Wed, 01 Jul 2020 07:01:41 GMThttps://devzone.nordicsemi.com/thread/257710?ContentTypeID=1Wed, 01 Jul 2020 07:01:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:15d2a612-917e-4c7d-abf4-f624f96e5f7bPaulGui<p>HI !<br />You were right about the retransmission. Cause this problem was happening when i was in debug mode (The retransmission is at 1 by default) so it reset the current value (which i put at 0 on nRF Mesh). So the message was resend and when the pyload was too much, it didn&#39;t</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/257294?ContentTypeID=1Mon, 29 Jun 2020 08:44:57 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6fdf6890-7715-43da-885e-29f499328b1eMttrinh<p>Hi,</p> <p>I don&#39;t think this is a known issue, not that I am aware of at least. Yes, it is strange that this happens. When you say &quot;the message is sent twice&quot;, is the message sent twice or retransmitted?</p> <p>Have you gone through the code and checked if you have some sort of code that calls the sending function twice when sending 9bytes or under?</p> <p>Could you provide me with some logs for the two scenarios?&nbsp;</p><div style="clear:both;"></div>