Hello,
i have solved this issue few days ago. The MIB file provided by Grandstream was still bad and weirdly enough, MIB file for HT8xx worked. I dont know why, but thanks for your help! Appreciate it!
Ah, the blank result just means that your model doesn't report 'health' values. You should see something like the following (on most models) when checking 'resource' values:
[admin@router-01] > /system resource print oid
used-memory: .1.3.6.1.2.1.25.2.3.1.6.65536
uptime: .1.3.6.1.2.1.1.3.0
build-time: .1.3.6.1.4.1.14988.1.1.7.6.0
total-memory: .1.3.6.1.2.1.25.2.3.1.5.65536
cpu-frequency: .1.3.6.1.4.1.14988.1.1.3.14.0