Influxdb-telegraf

Hi Team,
I’m new in this group , recently I installed grafana, influxdb and telegraf in my company.
I have a big problem, the problem is that when i try to run snmpwalk from cli to discovery my device in lan everything works fine, I can see every OID but, when i try to build a query into grafana I don’t see anything.
I add in my telegraf.conf information about my device, when i try to run telegraf --test I don’t see any information that I inserted before into the file…as a conseguence, in influxdb nothing is reported.
Could you help me to fix the problem ?

Many thanks in advanced for yout time and consideration.
Awaiting your news.
Rgds
Paolo