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849	849	[[image:image-20240820113015-60.png]]
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851		-== (% data-sider-select-id="765eceff-93b1-40ee-800b-b7b7d022ef8a" %)6.3 What is the Downlink Command by the NB device?(%%) ==
	851	+== (% data-sider-select-id="765eceff-93b1-40ee-800b-b7b7d022ef8a" %)6.3 What is the Downlink Command by the -CB device?(%%) ==
852	852
853	853	(% data-sider-select-id="bb6e9353-0c3f-473c-938d-4b416c9a03e6" %)
854	854	=== UDP: ===
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900	900
901	901	[[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/]]
902	902
	903	+
	904	+== 6.4 What if the signal is good but the domain name resolution fails? ==
	905	+
	906	+
	907	+If the domain name resolution fails, first check whether the domain name is correct, users can use their own website domain name resolution tool to verify the domain name.
	908	+
	909	+[[image:image-20240827150705-6.png||height="489" width="687"]]
	910	+
	911	+If the domain name is correct, but the domain name cannot be resolved, the user can turn off the domain name resolution function(AT+GDNS=1) and use the domain name communication directly.
	912	+
	913	+* Set the DNS
	914	+
	915	+(% style="color:blue" %)**AT Command: AT+GDNS**
	916	+
	917	+**AT+GDNS=0**  ~/~/Default. Automatically resolves the domain name and uses the resolved IP to communicate.
	918	+
	919	+**AT+GDNS=1    **~/~/Disabling Domain name resolution. Use the domain name directly to communicate.
	920	+
	921	+(% style="color:red" %)**Note: For -CB products, with the exception of AT+PRO=2,5, all protocols and payload formats support direct domain communication.**
	922	+
	923	+Example:
	924	+
	925	+[[image:image-20240827150121-5.png||height="476" width="680"]][[image:image-20240827145055-4.png||height="484" width="678"]]
	926	+
	927	+
	928	+== 6.5 GPS debugging ==
	929	+
	930	+
	931	+The following are three related AT commands that introduce GPS functions.
	932	+
	933	+* **Turn on/off GPS**
	934	+
	935	+(% style="color:blue" %)**AT Command: **(% style="color:#037691" %)**AT+GPS **
	936	+
	937	+**Ex1:  **AT+GPS=0  ~/~/ Turn off GPS
	938	+
	939	+**Ex2:  **AT+GPS=1  ~/~/ Turn on GPS
	940	+
	941	+(% style="color:blue" %)**Downlink command:**(%%)** (% style="color:#037691" %)0x11(%%)**
	942	+
	943	+Format: Command Code (0x11) followed by 1 byte.
	944	+
	945	+Example:  Downlink Payload: **11 01   **~/~/ AT+GPS=1
	946	+
	947	+
	948	+* **Set GNSS open time**
	949	+
	950	+Extend the time to turn on GNSS. The automatic GPS location time is extended when the node is activated.
	951	+
	952	+(% style="color:blue" %)**AT Command: **(% style="color:#037691" %)**AT+GNSST**
	953	+
	954	+Example: AT+GNSST=30  ~/~/ Set the GPS positioning time to 30 seconds
	955	+
	956	+(% style="color:blue" %)**Downlink command:**(%%)** (% style="color:#037691" %)0x10(%%)**
	957	+
	958	+Format: Command Code (0x10) followed by 2 bytes.
	959	+
	960	+Example:  Downlink Payload: **10 00 1E    **~/~/ AT+GNSST=30
	961	+
	962	+
	963	+* **Set GPS positioning interval**
	964	+
	965	+Feature: Set GPS positioning interval (unit: hour).
	966	+
	967	+When GPS is enabled, the node automatically locates and uplinks each time it passes **GTDC time** after activation.
	968	+
	969	+(% style="color:blue" %)**AT Command: **(% style="color:#037691" %)**AT+GTDC**
	970	+
	971	+Example: AT+GTDC=24  ~/~/ Set the GPS positioning interval to 24h.
	972	+
	973	+(% style="color:blue" %)**Downlink command:**(%%)** (% style="color:#037691" %)0x12(%%)**
	974	+
	975	+Format: Command Code (0x12) followed by 3 bytes.
	976	+
	977	+Example: 24 hours:  24(D)=0x18(H)
	978	+
	979	+ Downlink Payload: **12 00 00 18   **~/~/ AT+GTDC=24
	980	+
	981	+
	982	+Indoor GPS signal is very weak, outdoor positioning is generally recommended.
	983	+
	984	+
	985	+
	986	+
	987	+
	988	+
	989	+
	990	+
903	903
904		-​

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