AMR Isolated client
Manage client printers just via email.
Sometimes your customer is afraid of external attacks and does not want any external communication other than email.
The AMR controller (DCA) for isolated clients sends meter reads through the email channel. At the other extreme, the system will automatically upload those emails and add them to the database as a normal meter reading.
In this scenario, the printer reseller has standard clients with normal Internet access and some other clients that only allow email reporting. All the data that comes from both types of customers is combined in one database, no matter where is it coming from.
The mail server can be an AMR server, which makes setup easier and more reliable, or it can also be the client's mail server. It will take some testing to make sure the emails get delivered.