for vehicle tracking and e.g. building temperature control. Sometimes one can find IoT, tracking, radiomodems etc. devices with bluetooth on.

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Lidl xBeacon
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Frogblue control system, for e.g. alarms, heating ...
https://play.google.com/store/apps/details?id=com.frogblue.go&hl=fi&gl=US
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MC7010 5G wireless router (for outdoor use), sometimes with default PIN code.
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