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filter: require >1 AT-capable cdc-acm interfaces

Aleksander Morgado requested to merge aleksm/ModemManager:aleksander/plugin-multiple-acm into master

Instead of blindly allowing to be probed all ttyACM ports that report them as AT-capable, we will now instead forbid all ttyACM ports that don't report themselves as AT-capable. And, in addition to that, we will also now require the modem to expose more than one such AT-capable ttyACM port.

This update should avoid automatically probing Arduino devices that wrongly report their exposed single ttyACM port as AT-capable.

https://github.com/arduino/ArduinoCore-avr/pull/92 #140 (closed) #127 (closed) https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=930264

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