https://devzone.nordicsemi.com/f/nordic-q-a/70343/could-i-modify-bluetooth-mesh-net-packetHi, I&#39;m use nrf52840 with Light switch example of nRF5 SDK for Mesh v5.0.0 . Could I modify the packet of network layer ? I want to add 2 bytes of UUID in the packet of network layer when it relay , because I want to know the route of packet. en-USTelligent Community 13Thu, 14 Jan 2021 13:14:08 GMThttps://devzone.nordicsemi.com/thread/289214?ContentTypeID=1Thu, 14 Jan 2021 13:14:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2d42aad1-6d57-4d88-9aeb-2e66d28f735aMttrinh<p>Hi,</p> <p>Unfortunately, you can&#39;t modify packet on the network layer. But&nbsp;<span>Bluetooth Mesh implements&nbsp;a Health server model as a root model so by utilizing that you can monitor message delivery across the mesh network. I can read more about this in the <a href="https://www.bluetooth.org/docman/handlers/downloaddoc.ashx?doc_id=457092" rel="noopener noreferrer" target="_blank">Bluetooth Mesh Specification</a>.</span></p><div style="clear:both;"></div>