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2	2	**Note when using MQTT:**
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6	6	1）AT+CLIENT cannot be set to NULL
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10	10	2) AT+SERVADDR length should not exceed 21 bytes
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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.
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18	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)
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21	21	[[image:https://wiki.dragino.com/images/thumb/6/6e/MQTT_BROKER.png/600px-MQTT_BROKER.png||height="159" width="600"]]
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