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851		-== (% data-sider-select-id="765eceff-93b1-40ee-800b-b7b7d022ef8a" %)6.3 What is the Downlink Command by the -CB device?(%%) ==
	851	+== (% data-sider-select-id="765eceff-93b1-40ee-800b-b7b7d022ef8a" %)6.3 What is the Downlink Command by the NB device?(%%) ==
852	852
853	853	(% data-sider-select-id="bb6e9353-0c3f-473c-938d-4b416c9a03e6" %)
854	854	=== UDP: ===
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902	902
903	903
904	904	​
905		-
906		-== 6.4 What if the signal is good but the domain name resolution fails? ==
907		-
908		-
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.
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		-
926		-
927		-
928		-
929		-
930		-
931		-
932		-

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