@GL as @alemabrahao posted, the upgrade version for those models (when in a mixed network set to run r31-1) would be latest GA r30 release (MR 30.7.1)
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Moderator note: Marking @GreenMan's reply as the solution to this thread as it seems to answer the question. @GL you can un-mark it as the solution if you need more details.
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The MT12 leak detector might work. It presumably works by sensing the change in current through the sensor cable, so I'd think you could use it as an open/closed detector.
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You can use BXD SFP's on Meraki managed/monitored Catalyst switches but on native MS switches it is NOT supported. The choice of switch is not fitting for this requirement.
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