The most common reasons for a device to stop returning meters and supplies are:
The device IP address changed
The installation/data collection agent (DCA) is offline
The device was replaced and is no longer used
The device is temporarily turned off
The device tracking was disabled
The device > settings > SNMP timeout may need to be increased to 3000
The device > settings > SNMP version or community entry may no longer match what the device is using
The device may have SNMP disabled
SNMP port 161 communication between the DCA and device is blocked
If there is a replacement DCA, it may be that the new DCA just needs to discover/scan for the device.
Recommendations
If the DCA is online submit a job for the DCA to run an on-demand scan of the device IP address if known, else scan the network segments as described at https://docs.printtrackerpro.com/docs/guides/discovery#on-demand-scans.
If DCA is online and 'View Devices' is displaying the device's correct IP address, then submit a job to upload device meters as described at https://docs.printtrackerpro.com/docs/guides/meters#on-demand-uploads
If the DCA is online, the 'View Devices' screen lists the device's current IP address, and jobs to upload meters and supplies fail, then submit a job for the DCA to run a network topology scan on the device IP address.
The scan results will indicate if the DCA detected: a PING response, SNMP, embedded web server, printing device SNMP
