Multitech MultiConnect xDot MTXDOT-NA1 Series Developer's Manual page 76

APPENDIX A RELEASE NOTE ARCHIVE
What's New in Firmware Version 4.0
The new release includes the following changes:
Configuration Persistence
FOTA Enhancements
New and updated AT Commands
Configuration Persistence
To safeguard your configuration, the device offers configuration persistence in the form of configuration
redundancy and wear leveling.
Note: These features change the configuration storage and make the firmware update a one way process. The
configuration is not backward compatible to any version less than 4.0.x. Once a device is flashed with 4.0.x
firmware, the configuration is converted to a new format. Any versions earlier than 4.0.x cannot parse this new
format.
FOTA Enhancements
Required Flash Components
In order to use FOTA on xDot, an external flash device is required.
Several flash parts have been tested and are recommended. A set of flash parameters are documented for
replacement part selection. Refer to External Flash Components for FOTA section in this guide for more details.
Bootloader Update
Bootloader can install firmware upgrades from regular files, compressed files, or patch files. Firmware upgrade
images cannot contain a bootloader (application only). Use mbed tools to merge bootloader with application
firmware.
xDot bootloader detects compatible external flash devices and installs new firmware if an upgrade file is present.
Firmware image manifest
Firmware file manifests allow full images, compressed images, and differential updates.
Image Compression and Diff images
BSDiff and LZ4 compression can be used to reduce the size of firmware upgrades sent over-the-air. Smaller files
reduce the time required to deliver an update. Smaller FOTA sessions increase end-device battery life.
Multicast Session Scheduling
Multicast sessions are now scheduled using LowPowerTimeout instead of events. Session schedules are maintained
while sleeping.
AT Command Additions and Modifications
Note: For AT Command details, refer to:
From LoRaWAN changes:
Added AT+BTO - Class B timeout 0-120s.
Added AT+CTO - Class C timeout 0-120s.
76
S000768 xDot AT Command Reference Guide .
®
xDot Developer Guide