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Last modified by Mengting Qiu on 2025/07/03 18:55
From version 229.1
edited by Mengting Qiu
on 2025/06/16 09:06
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To version 226.2
edited by Mengting Qiu
on 2025/06/13 17:10
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1024 1024  [[image:image-20240226111928-1.png]]
1025 1025  
1026 1026  
1027 -== (% data-sider-select-id="765eceff-93b1-40ee-800b-b7b7d022ef8a" %)6.5 (%%)What is the Downlink Command Format for NB Devices? ==
1027 +== (% data-sider-select-id="765eceff-93b1-40ee-800b-b7b7d022ef8a" %)6.5 What is the Downlink Command by the NB device?(%%) ==
1028 1028  
1029 1029  
1030 1030  Firstly, it is recommended that users upgrade the firmware of the -NB node to the latest version, as the processing method for downlink commands varies depending on the firmware version. Below, we will introduce the latest downlink command format.
1031 1031  
1032 1032  (% data-sider-select-id="bb6e9353-0c3f-473c-938d-4b416c9a03e6" %)
1033 -=== **UDP Protocol:** ===
1033 +=== UDP: ===
1034 1034  
1035 -Only supports valid **HEX-format downlink commands** corresponding to AT command.
1036 1036  
1036 +(% data-sider-select-id="14a4790e-7faa-4508-a4dd-7605a53f1cb3" %)
1037 +Its downlink command is the same as the AT command, but brackets are required.
1038 +Example:
1037 1037  
1040 +{AT+TDC=300}
1038 1038  
1042 +
1039 1039  (% data-sider-select-id="90b80f1a-e924-4c8a-afc5-4429e019a657" %)
1040 1040  === MQTT: ===
1041 1041  
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1079 1079  [[http:~~/~~/wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/>>http://wiki.dragino.com/xwiki/bin/view/Main/End%20Device%20AT%20Commands%20and%20Downlink%20Command/]]
1080 1080  
1081 1081  
1082 -(% style="color:red" %)**Note:**
1083 -
1084 -(% style="color:red" %)**1. Only when the correct and valid download command is used and the format is correct can the device be configured through the download command. Invalid download content cannot be processed by the device and will be automatically restarted.**
1085 -
1086 -(% style="color:red" %)**2. Devices designed with downlink commands can utilize different downlink formats (e.g., JSON or HEX) for configuration. However, regardless of the format, the functionality is strictly limited to the downlink command specifications described in the user manual's AT command explanation.**
1087 -
1088 -(% style="color:red" %)**For example, the HEX-format downlink command corresponding to AT+TDC can only be used to configure TDC and cannot be used for queries. There is no HEX-format downlink command equivalent to AT+TDC=? , so querying TDC via downlink is not supported.**
1089 -
1090 -[[image:1750035004731-376.png||height="276" width="557"]]
1091 -
1092 -
1093 1093  == (% data-sider-select-id="765eceff-93b1-40ee-800b-b7b7d022ef8a" %)6.6 How to get the debug log for further analyze?(%%) ==
1094 1094  
1095 1095  
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