make WOL setup more resilient to platform (?) specific issues

- HACK: TO BE FIXED properly as soon as core issue fully understood

  on macOs we get Error: send EADDRNOTAVAIL 255.255.255.255:9
  when sending the magic packets.

  targeting TV's address fixes that and WOL then works...

  OTOH this is not a general purpose solution as elsewhere we actually
  need to target 255.255.255.255 for WOL to work.

  issue spoted while chasing #90

- en passant src/upnpsub.ts renamed to src/networkUtils.ts

Signed-off-by: António Meireles <antonio.meireles@reformi.st>

src/accessory.ts

@@ -421,7 +421,17 @@ class VieramaticPlatformAccessory {
     else if (nextState === this.Characteristic.Active.ACTIVE && this.userConfig.mac) {
       this.log.info('sending WOL packets to awake TV')
       // takes 1 sec (10 magic qpkts sent with 100ms interval)
-      await wakeOnLan(this.userConfig.mac, { address: this.device.address, packets: 10 })
+      try {
+        await wakeOnLan(this.userConfig.mac, { packets: 10 })
+      } catch {
+        // XXX on macOs above returning: Error: send EADDRNOTAVAIL 255.255.255.255:9
+        //     setting TV's address fixes that and WOL then works...
+        //     OTOH that is not a general purpose solution as elsewhere we actually need to
+        //     target 255.255.255.255 for WOL to work
+        // XXX fully understand root issue here as this is too hackish...
+        this.log.warn('fallback WOL route. (%s instead of 255.255.255.255)', this.device.address)
+        await wakeOnLan(this.userConfig.mac, { address: this.device.address, packets: 10 })
+      }
       // wait another sec for older sets with slowish CPUs
       await sleep(1000)
       await this.updateTVstatus(nextState)

src/ui/server.ts

@@ -1,7 +1,7 @@
 import { HomebridgePluginUiServer, RequestError } from '@homebridge/plugin-ui-utils'
 
 import { Abnormal, Outcome } from '../helpers'
-import { vieraFinder } from '../upnpsub'
+import { vieraFinder } from '../networkUtils'
 import { VieraAuth, VieraSpecs, VieraTV } from '../viera'
 
 const enum UIServerRequestErrorType {

src/viera.ts

@@ -8,7 +8,7 @@ import { decode } from 'html-entities'
 import { InputVisibility } from './accessory'
 import { Abnormal, EmptyObject, isEmpty, isValidIPv4, Ok, Outcome, prettyPrint } from './helpers'
 import { xml2obj, xml } from './helpers.server'
-import { UPnPSubscription } from './upnpsub'
+import { UPnPSubscription } from './networkUtils'
 
 // helpers and default settings
 const AudioChannel: string = xml({ Channel: 'Master', InstanceID: 0 })