File System AT Commands

Note

The File System AT commands are enable by default and cannot be disabled.

AT+FS commands perform corresponding operations in the AT directory of the file system.

AT+CERT commands perform corresponding operations in the CERT directory of the file system.

If you want to preload files, please 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>

Note

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

List files in directory:

AT+FS=0

OK

Delete file “test.txt”:

AT+FS=1,"test.txt"

OK

Get size of file “data.bin”:

AT+FS=2,"data.bin"
+FS: 1024

OK

Read 50 bytes from file “log.txt” starting at offset 100:

AT+FS=3,"log.txt",100,50
+FS: <read data>

OK

Write 100 bytes of data to 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>