Last year, I had raised the issue that one of our devices was sending data but nothing was delivered to our backend. The related issue was this one (Add tool to grab bytes sent through service).
We are currently encountering this same issue with a different device. The device has been sending messages for more than a year, but suddenly, the messages are not reaching the backend though we can see that they are reaching the network. Nothing has been delivered to our server from that device for 5 days. Our devices are not updated in the field and our service has not changed on the backend. Messages from other identical devices are working properly with their messages delivered.
I ask again if there is any way to debug this as my previous support request was supposed to be passed to customer support but I heard nothing further and it was automatically closed.