No Service to sleep/wake up IMU.

[brolin-botsync]

I tried creating a service to implement the sleep/wake feature but it does not seem to work.

std::vector<uint8_t> Wt901c::genSleepCall() const
{
    return std::vector<uint8_t>{0xFF, 0xAA, 0x22, 0x01, 0x00};
}

This is the function which is similar to the other calibration services. The service is also being listed when I run the node. But when I call the service the IMU does not seem to sleep. I am able to see datas coming in the /data_raw topic.

@strv Any suggestion on how to implement this feature would be appreciated.