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Table Of Contents
SARA-R4 series-AT commands manual
UBX-17003787 - R16
17File System
Page 202 of 401
17.7Partial download file +UDWNBLOCK
+UDWNBLOCK
SARA-R410M-02B SARA-R410M-52B SARA-R410M-63B SARA-R410M-73B SARA-R410M-83B
SARA-R412M
Modules
SARA-N4
Syntax PIN required Settings saved Can be aborted Response time Error referenceAttributes
full No No No - +CME Error
17.7.1Description
Stores (writes) a file to the file system:
• The stream of bytes can be entered after the '>' prompt has been provided to the user. The file transfer is
terminated exactly when <size> bytes have been sent entered and either "OK" final result code or an error
result code is returned. The feed process cannot be interrupted i.e. the command mode is re-entered once
the user has provided the declared the number of bytes.
• If the file already exists, the data will be appended to the file already stored in the file system.
• If the data transfer stops, after 20 s the command is stopped and the "+CME ERROR: FFS TIMEOUT" error
result code (if +CMEE=2) is returned.
• If the module shuts down during the file storing, all bytes of the file will be deleted.
• If an error occurs during the file writing, the transfer is aborted and it is up to the user to delete the file.
Differently from +UDWNFILE AT command, this command allows the user to write only a portion of the
file, indicating the offset and amount of bytes.
17.7.2Syntax
Type Syntax Response Example
Set AT+UDWNBLOCK=<filename>,
<offset>,<size>,<filesize>[,<tag>]
>
<text>
OK AT+UDWNBLOCK="filename",0,36,
500,"USER"
>
The 36 downloaded bytes of the file!
OK
17.7.3Defined values
Parameter Type Description
<filename> String Filename. For file system filename and data size limits, see File system limits.
<offset> Number Offset in bytes from the beginning of the file.
<size> Number Number of bytes to be written starting from the <offset>.
<filesize> Number The size of the file to be written
<tag> String The optional parameter <tag> specifies a different application file type. FILE TAGS
table lists the allowed <tag> strings.
17.7.4Notes
• The <tag> parameter is supported only for "USER".
17.8File system limits
17.8.1Allowed characters in filenames
A filename cannot contain the following characters: / * : % | " < > ?
17.8.2Limits
Here below are listed the maximum file name length, the maximum data size of the file system and the
maximum number of files for the u-blox cellular modules.
Maximum file name length: