MQTT print job

After the terminal connects to the MQTT server, it waits for the print message issued by the server

{
    "dvsno":"xxx",
    "kind":"PRINT_TASK",
    "count":"1",
    "list":[
        {
            "task_id":"C147956F-C688-40CB-B0C5-A68E9677AA41",
            "usbidx":"0",
            "file_size":"0",
            "target_file":"xxx"
        }
    ]
}

Field	Type	Description
dvsno	String	Terminal ID
kind	String	Command ID, default is PRINT_TASK
count	String	the number of print jobs
list	JSON array	Print task list
task_id	String	Task ID, which is maintained by the business platform itself
usbidx	String	printer interface identifier, the value is 0~2, representing 3 USB interfaces respectively
file_size	Int	packet size 0: download and print content by URL, >0: print data packet target_file field data length
target_file	String	When the value of file_size is 0, this field is the URL address for the print server to obtain the print data. When the value of file_size is greater than 0, this field is the data sent directly to the printer, encoded in BASE64

    Note: The data size of this message package should not exceed 1MB

作者：admin 创建时间：2023-03-31 08:45
最后编辑：admin 更新时间：2023-12-18 22:31