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Last modified by Mengting Qiu on 2025/07/03 18:55
From version 226.1
edited by Mengting Qiu
on 2025/03/08 11:33
Change comment: There is no comment for this version
To version 228.7
edited by Mengting Qiu
on 2025/06/16 09:05
Change comment: There is no comment for this version

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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 by the NB device?(%%) ==
1027 +== (% data-sider-select-id="765eceff-93b1-40ee-800b-b7b7d022ef8a" %)6.5 (%%)What is the Downlink Command Format for NB Devices? ==
1028 1028  
1029 1029  
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 +
1030 1030  (% data-sider-select-id="bb6e9353-0c3f-473c-938d-4b416c9a03e6" %)
1031 -=== UDP: ===
1033 +=== **UDP Protocol:** ===
1032 1032  
1035 +Only supports valid **HEX-format downlink commands** corresponding to AT command.
1033 1033  
1034 -(% data-sider-select-id="14a4790e-7faa-4508-a4dd-7605a53f1cb3" %)
1035 -Its downlink command is the same as the AT command, but brackets are required.
1036 -Example:
1037 -
1038 -{AT+TDC=300}
1039 -
1040 -
1041 1041  (% data-sider-select-id="90b80f1a-e924-4c8a-afc5-4429e019a657" %)
1042 1042  === MQTT: ===
1043 1043  
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1081 1081  [[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/]]
1082 1082  
1083 1083  
1080 +(% style="color:red" %)**Note:**
1081 +
1082 +(% 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.**
1083 +
1084 +(% 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.**
1085 +
1086 +(% 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.**
1087 +
1088 +[[image:1750035004731-376.png||height="276" width="557"]]
1089 +
1090 +
1084 1084  == (% data-sider-select-id="765eceff-93b1-40ee-800b-b7b7d022ef8a" %)6.6 How to get the debug log for further analyze?(%%) ==
1085 1085  
1086 1086  
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