+void cli_putc(char c);
+uint16_t cli_getc(void);
+uint16_t cli_getc_cecho(void);
+uint8_t cli_getsn(char* s, size_t n);
+uint8_t cli_getsn_cecho(char* s, uint16_t n);
+void cli_putstr(const char* s);
+void cli_putstr_P(PGM_P s);
+void cli_hexdump_byte(uint8_t byte);
+void cli_hexdump(const void* data, size_t length);
+void cli_hexdump_rev(const void* data, size_t length);
+void cli_hexdump2(const void* data, size_t length);
+void cli_hexdump_block(const void* data, size_t length, uint8_t indent, uint8_t width);
+
+void echo_ctrl(char* s);
+int8_t cmd_interface(PGM_VOID_P cmd_desc);