CMD_FRC
ret = scd30_command_read(state, CMD_FRC, &val);
ret = scd30_command_write(state, CMD_FRC, val);
[CMD_FRC] = 0x5204,
[CMD_FRC] = 0x0039,
if ((cmd != CMD_FRC) && (cmd != CMD_SET_AMB_PRESSURE)) {
ret = scd4x_write(state, CMD_FRC, arg);
ret = scd4x_write_and_fetch(state, CMD_FRC, arg, &val, sizeof(val));