In doing our license plate recognition (LPR, aka ALPR, aka ANPR) integration, we think we spotted a bug.
The bug is with the Send Test Webhook. We tried to send it a few times but it did not seem to work. This issue is in Step 2 of Set Meraki Camera Webhooks to Plate Recognizer from our Integration Steps: https://platerecognizer.com/integrations/meraki/
Basically, sharedSecret is "" but should be "secret".
However, I don't think you should be using webhooks. You need a single image of when a vehicle is spotted. Webhooks send you many frames of motion collapsed (a motion recap image) onto a single frame, which will screw up ALPR. There is an option to disable this in the GUI - but when I tried this it will it still sends motion recap images.
Hi Philip - thanks for the reply! I should have searched harder for the Test Webhooks bug. This seems to be an easy fix so I'm surprised it's a long-running bug. 😞
As for using the webhooks, actually, based on our tests, the Meraki webhooks is sending over a single image (one jpeg), not a motion recap. So we were able to decode the image and also show the results in our online dashboard.