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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		-​
905	905
906	906	== 6.4 What if the signal is good but the domain name resolution fails? ==
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908	908
909	909	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.
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	909	+[[image:image-20240827150705-6.png||height="489" width="687"]]
	910	+
911	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	912
913	913	* Set the DNS
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917	917	**AT+GDNS=0**  ~/~/Default. Automatically resolves the domain name and uses the resolved IP to communicate.
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919		-**AT+GDNS=1  **~/~/Disabling Domain name resolution. Use the domain name directly to communicate.
	919	+**AT+GDNS=1    **~/~/Disabling Domain name resolution. Use the domain name directly to communicate.
920	920
921	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.**
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923	923	Example:
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	925	+[[image:image-20240827150121-5.png||height="476" width="680"]][[image:image-20240827145055-4.png||height="484" width="678"]]
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	928	+== 6.5 GPS debugging ==
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	931	+The following are three related AT commands that introduce GPS functions.
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	933	+* **Turn on/off GPS**
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	935	+(% style="color:blue" %)**AT Command: **(% style="color:#037691" %)**AT+GPS **
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	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	+
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