AT+HMSUB

该指令用于订阅自定义主题。

指令	参数	参数缺省处理	AT响应结果	使用示例
AT+HMSUB=qos, topic	qos：topic的qos	默认值：0	+HMSUB OK when success	AT+HMSUB=0,"$oc/devices/my_deviceid/user/my_subtopic"
AT+HMSUB=qos, topic	topic：自定义主题	自定义	+HMSUB ERR:code code:reference to en_oc_mqtt_err_code_t defines	AT+HMSUB=0,"$oc/devices/my_deviceid/user/my_subtopic"

父主题： 模组AT指令参考

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