https://devzone.nordicsemi.com/f/nordic-q-a/62159/publish-timeout-handler-of-one-model-called-during-publish-timeout-handler-of-another-modelHi, I just have a small question: say I have two models, both with publish timeout intervals configured. After some time, one model&#39;s publish timeout handler is called. Could it be that the model&#39;s publish timeout handler is called during the handlingen-USTelligent Community 13Thu, 04 Jun 2020 15:17:08 GMThttps://devzone.nordicsemi.com/thread/253350?ContentTypeID=1Thu, 04 Jun 2020 15:17:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:558fbbd2-9b08-4ae6-ad9e-93e78b166611Mathias<p>Ok, thanks for the explanation!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/253342?ContentTypeID=1Thu, 04 Jun 2020 14:55:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cc2772ab-5ca4-4a7f-80d9-68934df30d62Hung Bui<p>Hi Mathias,&nbsp;</p> <p>No, they will run at the same priority level (either&nbsp;<a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.meshsdk.v4.1.0/group__MESH__DEFINES__API.html#ga1f773910993da2538b64bd3d6875a498">NRF_MESH_IRQ_PRIORITY_LOWEST</a>&nbsp;or&nbsp;<a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.meshsdk.v4.1.0/group__MESH__DEFINES__API.html#ga3c75e81adeb76c025c403caed6fae531">NRF_MESH_IRQ_PRIORITY_THREAD</a>&nbsp;depends how you configure your mesh stack). So they will not preempt each other. You don&#39;t need to have a semaphore to handle the access. And in addition, using critical region is not allowed when in mesh call back. Have a look here:&nbsp;<a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.meshsdk.v4.1.0/md_doc_user_guide_mesh_interrupt_priorities.html?cp=7_2_2_5">https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.meshsdk.v4.1.0/md_doc_user_guide_mesh_interrupt_priorities.html?cp=7_2_2_5</a></p><div style="clear:both;"></div>