Werner Wolfrum

Extented slcan.py to use "L" command optional to "O" command.

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Added additional parameter "listen_only" to open interface/channel with "L" command (in opposite to "O" command).

Design issue: Using "notifier" inside "with can.Bus(…) as bus" statement has no sufficient clean-up for reader threads

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## Description up to exception list: There are some community posts, as well as some Python examples, suggest to create a bus object using the "with" statement. See also section...