I’m trying to develop a procedure to upgrade the RAK3172 firmware from an attached linux SBC in the field.
I was able to flash the firmware via ST-Link, as well as with the Firmware Upgrade Tool.
What i’ve learned from https://forum.rakwireless.com/t/upgrade-rak4270-fw-from-external-mcu/4249 is, that the upgrade should work through:
- Send new firmware using Ymodem protocol to upgrade.
I successfully completed steps 1 and 2 but i’m seeing the same behaviour as stated in https://forum.rakwireless.com/t/automating-rui-v2-programming/4922
I’ve tried picocom, minicom and several ymodem libraries, but with no success. Sadly, the Firmware Upgrade Tool seems to be closed source, but i would appreciate some help here on how this should work.