User Guide to PL131
Document Number 1155-4713 Rev E
Page 27
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6.2.1 FOTA protocol message definitions
There are four message types utilized in FOTA.
6.2.1.1 File header
Table 6-1: FOTA file header message
Field Name
Data
Type Size
Notes
Opcode
Message opcode
U8
1 byte
Set to 0x3D
EndSeqNo
Total pkts in download - 1
U16
2 bytes
Checksum
Checksum of entire file after
compression
U16
2 bytes
FileId
(not used)
U8
1 byte
FileSize
Size of file after compression U32
24 bits
Unused
(not used)
4 bits
Reboot
1 bit
Set to 1
IsCompressed
1 bit
Set to 1 if file is compressed
IsNew
(not used)
1 bit
IsConcat
(not used)
1 bit
FileName
[MAX_FILENAME_LEN]
char
Set to NULL or “APL.BIN”.
MAX_FILENAME_LEN is set
to 64.
LastPacketSize
Size of the last packet
U32
4 bytes
additiveCRC;
(not used)
U16
2 bytes
6.2.1.2 Data
There are at most seven message packets per window.
Table 6-2: FOTA data message
Field Name
Data
Type Size
Notes
Opcode
Message opcode
U8
1 byte
Set to 0x3C
SeqNo
Sequence number of packet
starting at 0
U16
2 bytes
Checksum
Window checksum for at most 7
pkts
U16
2 bytes
Buff
[MAX_DATA_BUF_SIZE]
The data packet
U8
1 byte
MAX_DATA_BUF_SIZE
is set to 265.
