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Last modified by Mengting Qiu on 2025/07/17 10:51
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 229.17
edited by Mengting Qiu
on 2025/06/16 09:26
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 +Take the AT+TDC command of S31-NB as an example, that is, only the valid HEX format downstream command corresponding to the AT+TDC command can be used:
1038 +Downward format: (% style="color:blue" %)**01000384**(%%)  ~/~/ There are no Spaces. 0x0384(H)=900(D), that is, modify TDC to 900 seconds.
1037 1037  
1038 -{AT+TDC=300}
1040 +[[image:1750035991532-434.png||height="237" width="495"]]
1039 1039  
1040 1040  
1041 1041  (% data-sider-select-id="90b80f1a-e924-4c8a-afc5-4429e019a657" %)
1042 -=== MQTT: ===
1044 +=== **MQTT Protocol:** ===
1043 1043  
1046 +Supports both **JSON-format** and **HEX-format** downlink commands (corresponding to AT commands).
1044 1044  
1045 -Json：
1048 +//Example~:// For the S31-NB's uplink interval modification (AT+TDC=900):
1046 1046  
1047 -The Json format in MQTT mode needs to be configured with all commands.
1048 -If you have configurations that need to be changed, please change them in the template below.
1050 +* HEX format: (% style="color:blue" %)**01000384**(%%)  ~/~/ There are no Spaces. 0x0384(H)=900(D), that is, modify TDC to 900 seconds.
1051 +* JSON format: (% style="color:blue" %)**{AT+TDC=900}  **(%%)~/~/ The correct format is (% style="color:blue" %)**{AT Command}**(%%). No extra characters other than valid AT commands can be added within {}.
1052 +
1053 +(% style="color:red" %)**Note:**
1054 +
1055 +(% 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.**
1056 +
1057 +(% 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.**
1058 +
1059 +(% 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.**
1060 +
1061 +[[image:1750035004731-376.png||height="276" width="557"]]
1062 +
1063 +
1064 +**Template for Batch Configuration:**
1065 +
1066 +We can also use templates to configure multiple commands AT once. Users only need to modify the parameters of the required AT commands in the correct template for each device.
1049 1049  Template:
1050 1050  
1051 1051  {
... ... @@ -1071,16 +1071,19 @@
1071 1071  "AT+TEMPALARM3":"0"
1072 1072  }
1073 1073  
1074 -Hex：
1092 +**Instructions for Using the Template:**
1075 1075  
1076 -MQTT's hex format. Since many commands need to support strings, only a few commands are supported.
1094 +1. Modify the parameters for each AT command in the template as needed.
1095 +1. Send the entire template in one downlink command.
1077 1077  
1078 -The supported commands are consistent with LoRaWAN's hex commands.
1079 -Please refer to the following link to obtain the hex format:
1097 +**Note:**
1080 1080  
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/]]
1099 +* The template may vary depending on the device model.
1100 +* If you need a template for your specific device, please contact **Dragino Technical Support** at [[support@dragino.com>>url:https://mailto:support@dragino.com/]] to request the latest downlink template.
1082 1082  
1083 1083  
1103 +
1104 +
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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