Debugging with gdb

[sonman]

I want to play around with the code and debugging it.
After flashing I started openocd and then gdb to connect to it.
But unfortunately
When executing gdb nrf52810_xxaa_s112_patched.elf it says No debugging symbols found.
How enable debugging ?

[sonman]

nrf52810_xxaa.out has the debug information. But due to converting it to a .hex file it got lost I assume.
The hex file convert is necessary to merge it with the soft device (what's that?) I assume.