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Problems with 'Packed Mode' using MMS

giovanni_dqgiovanni_dq
edited February 2022 in Python

When I use the sensors in streaming mode I would like to send the data in packets and I saw that there is a function (packed) to send multiple samples in one bluetooth packet. However, if I use the code that is among the examples (the one of the gyroscopes) it gives me as error "segmentation fault". Can you tell me how I can solve ? also I would like to know if the packed mode is usable also in logging mode (I tried but I failed).

Thanks

Comments

  • MattMatt
    edited February 2022

    @giovanni_dq I had no problem running the stream_gyro_packed.py script. Are you using the latest version of the SDK?

    We can see the epoch is the same for clusters of 3 samples indicating that packets are coming in packed.

    GYRO: XX:XX:XX:XX:XX:XX -> epoch: 1645140821318, data: {x : 0.061, y : 0.000, z : 0.122}
    GYRO: XX:XX:XX:XX:XX:XX -> epoch: 1645140821318, data: {x : 0.122, y : -0.030, z : 0.091}
    GYRO: XX:XX:XX:XX:XX:XX -> epoch: 1645140821318, data: {x : -0.030, y : -0.122, z : -0.091}
    GYRO: XX:XX:XX:XX:XX:XX -> epoch: 1645140821378, data: {x : 0.122, y : -0.152, z : 0.091}
    GYRO: XX:XX:XX:XX:XX:XX -> epoch: 1645140821378, data: {x : -0.122, y : 0.000, z : 0.244}
    GYRO: XX:XX:XX:XX:XX:XX -> epoch: 1645140821378, data: {x : 0.091, y : -0.091, z : -0.091}

    Packed mode does not really save meaningful overhead when using the logger so I would not recommend trying to. It may or may not actually work, I do not think this would be among our unit tests. It is possible to simultaneously log unpacked while streaming packed so neither setup should limit how you use the device.

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