https://devzone.nordicsemi.com/f/nordic-q-a/30064/mesh-how-does-server-send-message-to-clientBoard: custom board Mesh SDK: V1.0.0 Softdevice: S132 IDE: SEGGER Embedded BLE: nrf52832 When I test the steps specified by “Interactive PyACI”, I can control client send message to server by this commond &quot;d[0].send(PacketSend(8, 0x0001, 15en-USTelligent Community 13Tue, 06 Feb 2018 00:53:44 GMThttps://devzone.nordicsemi.com/thread/119841?ContentTypeID=1Tue, 06 Feb 2018 00:53:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2452599a-391b-455e-a60a-fe1489110e75Beike<p>OK，thanks for your answer!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/119747?ContentTypeID=1Mon, 05 Feb 2018 13:07:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ef762ceb-45fe-441d-8248-a4d2e6a8fd83Hung Bui<p>Yes. You can communicate between nodes directly using unicast address.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/119714?ContentTypeID=1Mon, 05 Feb 2018 11:10:18 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4bf6f114-c52d-428e-b12f-aecc1c97ba29Beike<p>In the end , i use publication and subscription address to achive this need. Add I want to known if node can direct communate to a peer node by unicast address?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/119368?ContentTypeID=1Wed, 31 Jan 2018 13:45:06 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d9a1c95c-cef9-4bf1-b40b-5a9c01ce6dc4Hung Bui<p>Packetsend directly use access layer to send packet there is no client or server here. As long as you use correct address the peer device should receive the packet.</p><div style="clear:both;"></div>