Disable SHELL logger backend at runtime

[Ahmed Samir]

Hi,

I have the logging module activated with two backends UART and RTT. The SHELL module is using UART. I'm trying to control the SHELL UART logging backend at runtime, as I need to disable logs going through UART at certain conditions and re-enable them later.

This is the .conf file flags

CONFIG_USE_SEGGER_RTT=y

CONFIG_LOG_BACKEND_RTT=y

CONFIG_LOG_BACKEND_UART=y

CONFIG_SHELL_LOG_BACKEND=y

I used the z_shell_log_backend_disable() API, but I'm still seeing logs on the SHELL/UART. Is there other way to disable the shell uart logging backend?

    // disable shell log backend
    z_shell_log_backend_disable(shell_backend_uart_get_ptr()->log_backend);

[Charlie]

Hi Ahmed,

Yes, I think you can try runtime log filter to disabled log output on target backend with LOG_LEVEL_NONE.

You can search log_filter_set in ncs/v2.6.0 to learn its usage.

Best regards,

Charlie

[Ahmed Samir]

Is there a similar API in ncs/v2.4.1?

Is this log_filter_set could filter only SHELL UART without affecting the RTT logger?

[Charlie]

Ahmed Samir said:

Is there a similar API in ncs/v2.4.1?

Yes, I can find this function in Search — nRF Connect SDK 2.4.3 documentation (nordicsemi.com).

Ahmed Samir said:

Is this log_filter_set could filter only SHELL UART without affecting the RTT logger?

It should be since you need to specify backend argument uint32_t log_filter_set(struct log_backend const *const backend, uint32_t domain_id, int16_t source_id, uint32_t level).

Best regards,

Charlie

[Ahmed Samir]

I managed to get it working.
 

I used log_backend_disable() api for both SHELL and UART to completely disable logs then used log_backend_enable()  to re-enable logging.

// to disable
    log_backend_disable(log_backend_get_by_name("shell_uart_backend"));
    log_backend_disable(log_backend_get_by_name("log_backend_uart"));
    
// to enable

log_backend_enable(
        log_backend_get_by_name("log_backend_uart"),
        NULL,
        LOG_LEVEL_INF);

log_backend_enable(
        log_backend_get_by_name("shell_uart_backend"),
        (void*) shell_backend_uart_get_ptr(),
        LOG_LEVEL_INF);