What keeps a 3G USB dongle active?

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What keeps a 3G USB dongle active?

Post by davef » Wed Aug 26, 2020 1:27 am

I am running an ESP32 dev board from a powered USB hub connected to my laptop. I need usb_modeswicth to power up the3G dongle, but was hoping that after the whole system was working that I could remove the laptop.
(still keeping the 3G dongle powered up from an external supply).

However, the blue light goes out on the 3G dongle. What signals or conditions on the laptop's USB port keep the 3G dongle active? Appreciate a keyword and I'll hit Google again.

Just checking ... I assume that there isn't way to perform the functionality of usb_modeswitch in MicroPython ... easily.


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