serial_console_frontend interface can be implemented by
devices that want to retrieve the character stream passing through the text
console. Objects implementing this interface can be attached to a text
console and will receive output in the same way as a telnet connection.
SIM_INTERFACE(serial_console_frontend) {
void (*write)(conf_object_t *NOTNULL obj, uint8 value);
};
#define SERIAL_CONSOLE_FRONTEND_INTERFACE "serial_console_frontend"