https://devzone.nordicsemi.com/f/nordic-q-a/36309/mesh-send-timeoutInitially I had a project in Mesh 1.0. Everything (provisioning, send&amp;receive) was working fine. Since upgrade to the Mesh 2.1 there is an issue: provisioning still works but access_model_reliable_publish() always results in ACCESS_RELIABLE_TRANSFER_TIMEOUTen-USTelligent Community 13Fri, 13 Jul 2018 09:31:30 GMThttps://devzone.nordicsemi.com/thread/140037?ContentTypeID=1Fri, 13 Jul 2018 09:31:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8b348926-c9ae-48c1-9d0c-ca18fbe22b8fMttrinh<p>Hi,</p> <p>I&#39;m not sure what is wrong here. There have been a lot of changes from Mesh SDK 1.0 to Mesh SDK 2.1. If possible I would suggest you to start over with <a href="http://www.nordicsemi.com/eng/nordic/Products/nRF5-SDK-for-Mesh/nRF5-SDK-for-Mesh/62377" target="_blank" rel="noopener noreferrer">Mesh SDK 2.1.1</a></p><div style="clear:both;"></div>