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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）(% style="color:#037691" %)AT+CLIENT (%%)**cannot be set to NULL
	6	+1）AT+CLIENT cannot be set to NULL
7	7	)))
8	8
9	9	(((
10		-**2) (% style="color:#037691" %)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		-**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.
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16		-
	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.
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19	19	(((
20		-If you don't know the domain name IP, you can enter the command (% style="color:#037691" %)**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	)))
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28		-
	21	+[[image:image-20220530094905-1.png]]
	22	+
	23	+Example