About AnyNet Secure SIM files

Read AnyNet Secure SIM files using AT+CRSM. For more information, see AT+CRSM – reading files from the SIM.

File format

All files follow the same basic format:

<length><checksum><package>

where:

Variable	Parameter	Description
length	2-byte unsigned 16-bit integer	package byte length, part of the file header
checksum	4-byte unsigned 32-bit integer, stored by most significant byte first	package CRC-32 checksum, part of the file header
package	Binary data	The data field. Encryption keys and certificates may require some post-processing. For information about file location and post-processing requirements, see Available files and sizes.

Available files and sizes

Eseye delivers the following files to your AnyNet Secure SIM. File Max Size indicates the maximum amount of data available. The file header describes the length of the actual data.

Usable Bytes refers to the number of bytes available after the header is accounted for. For more information, see Reading the file header.

File Name	File ID (decimal)	File ID (hexadecimal)	File Max Size (bytes)	Usable bytes
Thing Name	28640	6FE0	256	250
Root CA	28641	6FE1	2048	2042
Public signed certificate	28642	6FE2	2048	2042
Private key	28643	6FE3	2048 (not encrypted) 4096 (encrypted)	2042   4090
MQTT Endpoint	28644	6FE4	256	250

The default path ID for the available files is: "3F007FEE". For more information, see AT+CRSM – reading files from the SIM.

For information about the basic data read process for each of the listed files, see Basic data read process.