Resolve "Add an option to send gNMI Subscribe requests via SBI"

Description

#227 (closed)

controller/nucleus/deviceWatcher.go

@@ -70,6 +70,8 @@ func (d *DeviceWatcher) callSubscribe(pndID string, device device.Device, opts *
 	}
 }
 
+// handleSubscribeResponse takes the subscribe response and additional information about the device to distinguish
+// from which device a subscribe response was sent including improved error handling
 func handleSubscribeResponse(resp *gpb.SubscribeResponse, pndID, deviceID, deviceName string) {
 	switch resp := resp.Response.(type) {
 	case *gpb.SubscribeResponse_Error: