Image Block Request - Digi XBee 3 ZigBee User Manual

Over-the-air firmware/file system upgrade process for Zigbee 3.0
Frame data fields
Data ZCL
payload frame
header
ZCL
payload
Checksum

Image Block request

The Client generates Image Block requests to request the server for bytes of the FOTA image. Each
image block is 64 byte long. The client also sends the file offset as a way to keep the synchronization
of every block intact.
The Image Block requests are repeated by the client until all the blocks of the image are successfully
obtained. The size of the FOTA upgrade image is usually obtained by the client in the Query Next
Image response message and hence it knows the exact number of Image Block requests it needs to
send.
Digi XBee® 3 Zigbee® RF Module
Offset Example Comments
Frame control 23 0x09
Transaction 24 0x01
sequence
number
Command ID 25 0x02
Status 26 0x00
Manufacturer LSB 0x1E
ID 27
MSB 0x10
28
Image type LSB 0x00
29
MSB 0x00
30
Firmware LSB 0x01
version 31
32 0x10
33 0x00
MSB 0x00
34
Image Size LSB 0x2E
35
36 0xF3
37 0x02
MSB 0x00
38
39 0xE5
Image Block request
Query Next Image Response
Success = 0x00
No Image Available = 0x98
Not Authorized = 0x7E
Firmware version of the new update file in
Little Endian. In this example, the version is
0x1001
328