+
+void cli_putc(char c);
+uint16_t cli_getc(void);
+uint16_t cli_getc_cecho(void);
+uint8_t cli_getsn(char* s, uint16_t n);
+void cli_putstr(char* s);
+void cli_putstr_P(PGM_P s);
+void cli_hexdump(void* data, uint16_t length);
+void cli_hexdump2(void* data, uint16_t length);