DFU OTA Mesh - pre-save update

[SET]

Hi,

I already achieved the update of all available nodes in a mesh network, where the update is injected over a serial connection to one node.

Now my question is, if I can load the whole update into the flash of the nRF52833 and then start the update if the whole dfu is on the device.

If this is possible, where should I start? Can I somehow overwrite the current serial connection in the DFU Mesh example with flow control to give back a successful 

response when I saved the packet?

[SET]

I have seen, that the serial packets come into the serial_handler_openmesh_rx function, where the opcode is SERIAL_OPCODE_CMD_OPENMESH_DFU_DATA. So I want to write my own example to fasten up the dfu speed to one controller.

How does the serial protocol look like to achieve this? There must be some header and CRC check, but I don't have the overview at the moment.