log.h

#include <string>

#if defined(ARDUINO)
void initlogger();
#endif

namespace logging {
        typedef enum { ll_debug, ll_info, ll_warning, ll_error } log_level_t;

	log_level_t parse_ll(const std::string & str);

#if defined(ARDUINO)
        extern log_level_t log_level_syslog;

	void sendsyslog(const logging::log_level_t ll, const char *const component, const std::string context, const char *fmt, ...);

#define DOLOG(ll, component, context, fmt, ...) do {  \
		if (ll >= logging::log_level_syslog)  {  \
			sendsyslog(ll, component, context, fmt, ##__VA_ARGS__);  \
		}  \
	} while(0)
#else
        extern log_level_t log_level_file, log_level_screen;

	void initlogger();
        void setlog(const char *lf, const log_level_t ll_file, const log_level_t ll_screen);
        void dolog (const logging::log_level_t ll, const char *const component, const std::string context, const char *fmt, ...);

#define DOLOG(ll, component, context, fmt, ...) do {                            \
                if (ll >= logging::log_level_file || ll >= logging::log_level_screen)           \
                        logging::dolog(ll, component, context, fmt, ##__VA_ARGS__);     \
        } while(0)
#endif
}

#if defined(ARDUINO)
#include <optional>
#include <string>
extern std::optional<std::string> syslog_host;
void init_logger(const std::string & name);
#endif