I am new to this forum. I have been looking to find an answer to this question and I hope I didn't miss the right post.
It is my understanding that device mapper output scripts are stateless. Is there a way to prevent a datum being updated when ignition is off? We have a device transmitting CAN data with a custom app using the GPSGATE Generic device. This device is transmitting 102% fuel level when the ignition is off. Is there a way in the Device Mapper Scripting to prevent the datum from being saved and keep the last one when ignition is off? returning null let the wrong datum pass through. Unfortunately we don't have access to the third party application.
Thanks in advance for your help