New device (PIC Microcontroller runing snmp agent with sensors)

I developed a board with a microcontroller that provides some variables from sensors.
Using SNMP commands in comand line with a MIB file I created, I am able to retrive all sensors values
I installed Librenms on a virtual machine and added the device to WEBUI.
How can I add graphs for sensors?

I executed discovery.php and my board is found but no sensors are discovered.

On the other hand I created a new os called Microchip adding a yaml file to Os’s but every time I executed discovery.php Os is changed from Microchip to ServersCheck and from ServersCheck to Microchip alternatively-

I would appreciatte some help to be able to record and graph my sensors on librenms.