Cope with deviceInstance changes, update dbus-native

Make sure that the cache copes with deviceInstance changes (which
happen with virtual nodes).
And also start depending on dbus-native-victron instead of
dbus-native.

package.json

@@ -3,7 +3,7 @@
     "description": "Custom Node-RED Nodes for Victron Energy",
     "version": "1.5.23",
     "dependencies": {
-        "dbus-native": "^0.4.0",
+        "dbus-native-victron": "^0.4.2",
         "debug": "^4.3.7",
         "lodash": "^4.17.21",
         "promise-retry": "^2.0.1",

src/services/dbus-listener.js

@@ -3,7 +3,7 @@
  * https://github.com/sbender9/signalk-venus-plugin/blob/master/dbus-listener.js
  */
 
-const dbus = require('dbus-native')
+const dbus = require('dbus-native-victron')
 const debug = require('debug')('node-red-contrib-victron:dbus')
 const _ = require('lodash')
 
@@ -167,12 +167,14 @@ class VictronDbusListener {
           service.fluidType = data.FluidType
         }
 
+        const deviceInstance =  data['/DeviceInstance'] != null ? data['/DeviceInstance'] : service.deviceInstance;
+
         const messages = _.keys(data).map(path => {
           return {
             path: '/' + path.replace(/^\/+/, ''),
             senderName: service.name.split('.').splice(0, 3).join('.'),
             value: data[path],
-            deviceInstance: (service.deviceInstance != null ? service.deviceInstance : ''),
+            deviceInstance,
             fluidType: service.fluidType
           }
         })
@@ -228,6 +230,9 @@ class VictronDbusListener {
           if (!service || !service.name) {
             return
           }
+          if (m.path === '/DeviceInstance') {
+            service.deviceInstance = m.value
+          }
           m.senderName = service.name.split('.').splice(0, 3).join('.')
           if (service.deviceInstance === null) {
             service.deviceInstance = searchDeviceInstanceByName(this.services, m.senderName, '')