diff --git a/board/meson.build b/board/meson.build
index 0c515fc..003b4f1 100644
--- a/board/meson.build
+++ b/board/meson.build
@@ -9,6 +9,7 @@ board_lib = static_library(
     sources : [
         'io3.c',
         'io3.h',
+        'slider-cmd.h',
         'slider-frame.c',
         'slider-frame.h',
     ],
diff --git a/board/slider-cmd.h b/board/slider-cmd.h
new file mode 100644
index 0000000..8a19ca7
--- /dev/null
+++ b/board/slider-cmd.h
@@ -0,0 +1,36 @@
+#pragma once
+
+#include "board/slider-frame.h"
+
+enum {
+    SLIDER_CMD_AUTO_SCAN = 0x01,
+    SLIDER_CMD_SET_LED = 0x02,
+    SLIDER_CMD_AUTO_SCAN_START = 0x03,
+    SLIDER_CMD_AUTO_SCAN_STOP = 0x04,
+    SLIDER_CMD_RESET = 0x10,
+    SLIDER_CMD_GET_BOARD_INFO = 0xF0,
+};
+
+struct slider_req_set_led {
+    struct slider_hdr hdr;
+    struct {
+        uint8_t unk; /* 0x28, decimal 40. meaning unknown. */
+        uint8_t rgb[32][3];
+    } payload;
+};
+
+union slider_req_any {
+    struct slider_hdr hdr;
+    struct slider_req_set_led set_led;
+    uint8_t bytes[260];
+};
+
+struct slider_resp_get_board_info {
+    struct slider_hdr hdr;
+    char version[32];
+};
+
+struct slider_resp_auto_scan {
+    struct slider_hdr hdr;
+    uint8_t pressure[32];
+};