Implement zephyr logger

[victor999]

Using zephyr logger:
#include <logging/log.h>
LOG_MODULE_REGISTER(foo); /* One per given log_module_name */
LOG_ERR - Level 1
LOG_WRN - Level 2
LOG_INF - Level 3
LOG_DBG - Level 4
Or LOG_HEXDUMP_ERR... and so on

[pcppcp]

Good. As I found out yesterday, there's another function that suits the output of shell submodules better (fprintf_shell()) - my bad.
Could you continue by adding a logger to the zephyr/web3_rpc and update some of the submodules' logging to use fprintf (see zephyr/erc20_shell.c for example)? The general idea is to use the logger for services that run as a background threads/libraries, and fprintf for the shell.
By the way, are you using NRF52 target or QEMU?

[victor999]

So you want to use logger (log.h) for the background threads, but for the shell submodules use fprintf_shell(), correct?
I use NRF52 target (nrf52840 dk), but I guess I need to use qemu as well.
May I use qemu that comes with Ubuntu 18.04 or I should compile it from source?

[pcppcp]

yes that's correct. You can use qemu from your distribution, I use -DBOARD=qemu_x86 as the target and it works just fine.