Function register_context 

pub unsafe extern "C" fn register_context(
    handle: &Context,
    context_id: &Id,
    description: *const c_char,
    desc_len: usize,
    level: LogLevel,
    trace_status: TraceStatus,
    level_changed_cb: Option<LogLevelChangedCallback>,
) -> ReturnValue

Register a context in the daemon with pre-defined log level and pre-defined trace status.

This function has to be called before first usage of the context.

• @param handle pointer to an object containing information about one special logging context
• @param contextid four byte long character array with the context id
• @param description long name of the context
• @param desc_len strlen of the description
• @param level This is the log level to be pre-set for this context (DLT_LOG_DEFAULT is not allowed here)
• @param status This is the trace status to be pre-set for this context (DLT_TRACE_STATUS_DEFAULT is not allowed here)
• @param level_changed_cb This is the fn which will be called when log level is changed
• @return Value from DltReturnValue enum