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1	1	(((
2		-(% style="color:blue" %)**Note when using MQTT:**
	2	+**Note when using MQTT:**
3	3	)))
4	4
5	5	(((
6		-1）**AT+CLIENT **cannot be set to NULL
	6	+1）AT+CLIENT cannot be set to NULL
7	7	)))
8	8
9	9	(((
10		-2) **AT+SERVADDR** length should not exceed 21 bytes
	10	+2) AT+SERVADDR length should not exceed 21 bytes
11	11	)))
12	12
13	13	(((
14	14	3) It is not recommended to use a domain name, as it will take a long time for the MQTT service to resolve the domain name for the first time and increase power consumption. It is recommended to use IP instead of domain name.
15		-
16		-
17	17	)))
18	18
19	19	(((
20		-If you don't know the domain name IP, you can enter the command **AT+QNDS **to resolve the domain name when it is not working (this process may take a long time)
21		-
22		-
23		-(% style="color:blue" %)**Example:**
24		-
25		-[[image:image-20220722171355-1.png]]
	18	+If you don’t know the domain name IP, you can enter the command AT+QNDS to resolve the domain name when it is not working (this process may take a long time)
26	26	)))
27	27
	21	+[[image:image-20220530094905-1.png]]
28	28
29		-
	23	+Example