Ebyte E840-DTU User Manual page 31

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Send: AT+ MQTT_SUBSCRIBE_TOPIC =<topicName><qos> <CR>
Returns: <CR><LF>+OK<CR><LF>
Inquire
Send: AT+ MQTT_SUBSCRIBE_TOPIC<CR>
Returns: <CR><LF>+OK=<topicName><qos><CR><LF>
Parameters: the subject name of the topicName subscription
The level of the message read by qos, the value of qos can be taken, 0, 1, 2
AT+MQTT_PUBLISH_TOPIC
Function: set / query MQTT platform address, port
Format: Configuration
Send: AT+ MQTT_PUBLISH_TOPIC =<topicName><qos> <CR>
Returns: <CR><LF>+OK<CR><LF>
Inquire
Send: AT+ MQTT_PUBLISH_TOPIC<CR>
Returns: <CR><LF>+OK=<topicName><qos><CR><LF>
Parameters: the subject name of the message published by topicName
The level of the message read by qos, the value of qos can only take 0
AT+MQTT_ALIAUTH
Function: Set/query the three elements of Alibaba Cloud platform. When MQTT mode is set to 1, it needs to
be configured when accessing Alibaba Cloud.
Format: Configuration
Send: AT+ MQTT_ALIAUTH =<value0><value1><value2> <CR>
Returns: <CR><LF>+OK<CR><LF>
Inquire
Send: AT+ MQTT_ALIAUTH<CR>
Returns: <CR><LF>+OK=<value0><value1><value2><CR><LF>
Parameters: <value0> product key
<value1>device name
<value2> device key
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E840-DTU(4G-02E) User Manual
31