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6		-1）**AT+CLIENT **cannot be set to NULL
	6	+**1）(% style="color:#037691" %)AT+CLIENT **(%%)cannot be set to NULL
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10		-2) **AT+SERVADDR** length should not exceed 21 bytes
	10	+**2) (% style="color:#037691" %)AT+SERVADDR**(%%) length should not exceed 21 bytes
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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.
	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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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)
	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)
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23	23	(% style="color:blue" %)**Example:**