Hi David, Il giorno mer 15 lug 2020 alle ore 19:06 David Guillen Fandos <david@xxxxxxxxxxx> ha scritto: > > Since I'm not aware of any other commercial solutions (apart from FTDI) > that use more than 2 ACM ports, could that be the issue? Meaning > there's a bug somewhere and no commercial hardware that can trigger it. > Telit modems like LE910V2 or LE910EU1 expose 6 cdc-acm ports and are working fine. Regards, Daniele