Today I've done EEPROM emulation inside FLASH (stm32f103 does not have EEPROM)

Also implemented settings that can be edited from CLI

Now I have commands:

get <setting>
set <setting> <value>
dump

After tracker starts, processor checking settings version and if it different from hex it just set default values.

Now I have that settings can be tuned:

set serial_baud 115200
set gps_baud 9600

In feature I will migrate all constants to settings value.