Hi, I purchased the LTE V2 Pro with Sierra North America modem installed ( https://www.modalai.com/collections/blue-uas-framework-components/products/m0130-3?variant=48186331726128 ). I am trying to set it up on my VOXL2 with a Canadian sim card from Rogers. I know the SIM card works (and APN is correct) since I have used it in another Quectel modem. I run the "voxl-configure-modem" command and set the following: Type of modem: 1) v2 connect to ModalLink: 2) no APN: 7) custom custom APN: lteinternet.apn modem region: 1) Americas After this it just gets stuck at "Waiting for ttyUSB2..." and does not proceed further. I have tried this a couple of times but without any success. Previously I was using a wifi dongle connected via the USB3.0/UART expander. I have removed it to plug in the LTE modem. Kindly help to set me up with the LTE modem. Thanks.

@ h3robotics It seems as though the modem itself is not being detected. Can you ensure that the add-on board is fully seated onto the VOXL and that both connectors are fully connected?

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Unable to configure LTE modem

Unsolved ESCs, Sensors and Accessories

21 Posts 4 Posters 6.0k Views 3 Watching

A Alex Kushleyev

@h3robotics , I see, thanks for clarifying.

Is the ESC detected by PX4? What you can do is stop the px4 service using systemctl stop voxl-px4 and then run the px4 in a terminal : voxl-px4 -d , this will start px4 with an interactive px4 shell. You can also see debug prints from different modules that are starting up. Look for the voxl_esc module, it should say whether it was able to detect the ESC and, if so, then it will print some information about the ESC, such as its type, firmware version, etc.

If the ESC is not detected, then you may have ESC parameters set up for incorrect baud rate (your PX4 params expect 2mbit, but perhaps your ESC is using lower bit rate, so you can update your ESC params to 2mbit). It is possible that your ESC is using 250K baud rate which is what it may ship with, so you can try 250K in PX4 to test that. If your ESC is set up for the lower bit rate, i would suggest updating that to at least 921600, or 1mbit or 2mbit in order to reduce delay and support the throughput for the ESC commands and telemetry.

Alex
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h3robotics

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#21

@Alex-Kushleyev That was it! I first tried with a lower baud rate of 250K on PX4 and I started getting the battery info. Then as you recommended, I uploaded new parameters to the ESC. I used:

python3 voxl-esc-upload-params.py --params-file ../voxl-esc-params/D0014_starling_1504_3000kv_ms_props/D0014_starling_1504_3000kv_ms_props.xml

because I will be using it on a drone of similar size and performance. Then with 2M baud rate in PX4, I was able to make it work!

Thank you.
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