Novatel MT 3060 R, Command Reference Manual, Page: 175 / 330

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AT$FFS Generic Flash File System Access
[…]
Response for Free and used space (<op> = 5):
$FFS: <free_bytes> Free Bytes, <used_bytes> Used Bytes
Response for Delete All (<op> = 86):
OK
Read Syntax
N/A
Response
N/A
Execute Syntax N/A
Response N/A
Parameter Values
<op>
FFS Operation
0 = write
1 = read
2 = delete
3 = directory
4 = directory with file size
5 = FFS free space and used space
6 = Output flash device name
86 = delete all files
<filename>
The filename in double quotes (i.e. “test.txt”)
Maximum length is 15 characters.
Filename parameter is required for the write (0), read (1), and delete (2) operations.
<seek> The position in the file to read or write given as a byte offset.
Seek parameter is required for the write (0) and read (1), operations.
Range: 0 - 524287.
<length>
The number of bytes to read or write.
Length parameter is only required for read and write operations.