/ {
  keymap {
    compatible = "zmk,keymap";

    default_layer {
      bindings = <
        &kp ESC   &kp A   &kp B
        &kp SPACE &kp C   &kp D
      >;
    };

    fn_layer {
      bindings = <
        &kp F1  &kp F2  &kp F3
        &kp F4  &kp F5  &kp F6
      >;
    };
  };
};