Hello @SSpitters,
Some of the Pepwave & Pepxim models have “Ignition Sense”, could you use that feature as a GPI (General Purpose Input)? You can find some of the fourms past discussion on this subject at Peplink | Pepwave - Forum or look on the main Peplink website.
The Pepxim Smart Readers have some additional GPI/O connections that may be of benefit to you, there is some information here on the forum at Introducing Pepxim, the TA App, and the Smart Reader!.
Happy to Help,
Marcus 
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