ModemManager - connecting multiple modems simultaneously always fail

[Lucas Pelegrino]

Thanks, Lars.

I looked up and found this
https://github.com/raspberrypi/firmware/issues/582

So I should be able to use up to 6 modems before I ran into this issue if
I'm not mistaken.

Em ter., 28 de set. de 2021 às 07:58, Lars Melin <larsm17 at gmail.com>
escreveu:

> On 9/28/2021 02:24, Lucas Pelegrino wrote:
>
>  > This modem works when I connect it by itself. I also tested
>  > different permutations and it seems it’s always the third modem that>
> can’t get a connection, independently of which one I put on first.
>  > This is the full log with debug on: https://pastebin.com/L3QWBppt
>  > <https://pastebin.com/L3QWBppt>
>  >
>  > Any ideas?
>  >
>
> Your host controller has a limit of 16 hostchannels (see
> /drivers/usb/dwc2/core.h) which means that it can only handle 16
> endpoints at a time.
> Your hardware is a Raspberry Pi and it is using an out-of-tree kernel
> driver (dwc_otg) which is known to be extremely buggy, one of many bugs
> is that it takes long time for it to release a hostchannel that is not
> in use.
>
> cheers
> Lars
>
>
>
>
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