Hellow,
I am using B-L072Z-LPWAN1 with GrumpyOldPizza/ **[ArduinoCore-stm32l0] (LORAWAN library) for INDIA (IN865) using Arduino Board but it shows that the selected serial port does not exist or your board is not connected.
can you tell me what is the problem exactly?
what are the drivers i have to install where i am using WINDOWS 10.
You should probably ask this on the support site for that port of the Arduino core, as the issue is there, not anything having to do with TTN or LoRaWAN.