SARA-G3 and SARA-U2 series - System Integration Manual
UBX-13000995 - R08
Objective Specification
System description
Page 77 of 188
The use of hybrid positioning requires a connection via the DDC (I
2
C) bus between the SARA-G340 / SARA-G350
cellular modules and the u-blox GNSS receiver (see section 2.6.4).
See
GNSS Implementation Application Note
[24] for the complete description of the feature.
u-blox is extremely mindful of user privacy. When a position is sent to the CellLocate server u-blox is
unable to track the SIM used or the specific device.
1.13.13
Firmware upgrade Over AT (FOAT)
Overview
This feature allows upgrading the module Firmware over the UART interface, using AT Commands.
AT command AT+UFWUPD triggers a reboot followed by the upgrade procedure at specified a baud rate
(see
u-blox AT Commands Manual
[3] for more details)
Both Xmodem-1k protocol (1024 bytes packets) and Xmodem protocol (128 bytes packets) can be used for
downloading the new firmware image via a terminal application
A special boot loader on the module performs firmware installation, security verifications and module reboot
Firmware authenticity verification is performed via a security signature during the download. The firmware is
then installed, overwriting the current version. In case of power loss during this phase, the boot loader
detects a fault at the next wake-up, and restarts the firmware download from the Xmodem-1k handshake.
After completing the upgrade, the module is reset again and wakes-up in normal boot
FOAT procedure
The application processor must proceed in the following way:
Send the AT+UFWUPD command through UART interface, specifying the file type and the desired baud rate
Reconfigure serial communication at selected baud rate, without flow control with the used protocol
Send the new FW image via the used protocol
For more details, see the
Firmware Update Application Note
1.13.14
Firmware upgrade Over The Air (FOTA)
Not supported by SARA-G300 and SARA-G310 modules.
Supported upon request on SARA-G340, SARA-G350 and SARA-U2 modules.
This feature allows upgrading the module firmware over the air, i.e. over the cellular network. The main idea
with updating firmware over the air is to reduce the amount of data required for transmission to the module.
This is achieved by downloading only a “delta file” instead of the full firmware. The delta contains only the
differences between the two firmware versions (old and new), and is compressed.
For more details, see the
Firmware Update Application Note
