The AG24 Asset IoT gateway can be paired with Samsara DM11 Door Monitor sensor for tracking of door open/close status of a trailer while in use. The Samsara door monitor can be used on swing doors and roll-up doors.
For swing doors: The magnet is placed on one door and the sensor on the opposing door or directly on the trailer. The magnet and sensor should be placed in such a way that they only come close when the door is closed.
It is possible to test different mounting locations by placing the sensor and magnet by hand before mounting with adhesive tape or screws. The sensor will flash orange three times when the magnet enters or leaves the sensing range - to test the range before mounting, keep the magnet and sensor more than 6 inches apart and then bring together until the LED blinks to indicate they are in range. Sensors can be placed inside of the trailer or outside.
For roll-up doors: The magnetic bar can be discarded. The sensor should be mounted at the top of the door, with the arrow pointing up, so that it lies horizontally when the door is rolled up. Ensure that the door frame won’t catch the sensor if mounting on the outside of the door. The sensor can be placed inside the trailer or outside.
More details on installing the DM11 can be found in the install guide: https://www.samsara.com/pdf/docs/door-monitor-installation-guide-thumb.pdf.