File System AT Commands

Note

The File System AT commands are enable by default and cannot be disabled.
AT+FS command performs corresponding operations in the AT directory of the file system.
AT+CERT command performs corresponding operations in the CERT directory of the file system.
If you want to preload files, refer to Preload Example.

AT+FS

Perform file system operations, including deleting files, reading files, writing files, getting file sizes, and listing files.

AT+FS=<operation>[,<filename>,<offset>,<length>]

Successful Response:

OK

Error Response:

ERROR: <error_no>

<operation>:

File operation type

<filename>:

File name string

<offset>:

Starting position for reading or writing

<length>:

Length to read or write

Note

When <operation> is set to write, the system will enter Transparent Transmission (TT) Mode mode.

Write 100 bytes of data to the file new.dat:

AT+FS=4,"new.dat",0,100
>>>
<send 100 bytes of data>

OK

Query the certificate components of the server or client

AT+CERT=<role>,<index>

Successful Response:

<Certificate name 1>
<Certificate content 1>

<Certificate name 2>
<Certificate content 2>

<Certificate name 3>
<Certificate content 3>

OK

Error Response:

ERROR: <error_no>

<role>:

Certificate component type

<index>:

Certificate component index