Need of Image Transfer Protocol for firmware upgrade through uart of mkm35z512vll7

By Jayakumar, 2 September, 2025
Forums
DLMSDirector

I am using the NXP AN12837SW reference design for my smart metering project with the MKM35Z512VLL7 controller. Now I want to transfer/send my .bin file to uart terminal through serial wire(not in gsm) for firmware upgrade.
Could you please clarify the following points:
1. How to load the (.bin) file in Gurux, How to divide it into 256-byte chunks and How to add CRC/AES Encryption data for transmission?
2. What is protocol/documentation available for image transfer?
3. Can we send the firmware without OBIS code through uart?
4. There is any relation available for firmware upgrade and OBIS code?
5. Any software tool is available to test firmware upgrade through uart?

Kurumi

4 months 1 week ago

Hi,

Image transfer is defined in DLMS standards, and you must use DMS to update the image. You can't just send the bytes. You need to establish the secured connection to the meter before you can update the image.

You can use GXDLMSDirector to update the firmware. You can find more information from Image transfer:

https://www.gurux.fi/Gurux.DLMS.Objects.GXDLMSImageTransfer

BR,
Mikko