MIN_RLX_CMD_BYTES
if (cmd_buffer_end <= MIN_RLX_CMD_BYTES + cmd) {
(cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) {
(cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) {
if (cmd_buffer_end - MIN_RLX_CMD_BYTES <= cmd) {