Upgrade experience from ISY to EISY

[maxnorth]

Overall, my upgrade experience was fine and I found the migration documentation to be fine. A few points to be aware of:

- If you want the IP address of your EISY to be the same as of your ISY, as I did, then you might want to make that happen before doing the migration.  In my case, I use static mapping in my Ubiquiti router, so I deleted the old mapping and added a new one using the mac address of the EISY.  The EISY admin console itself does not permit static mapping anymore, but this worked fine for me.  It's just more difficult to do it after the migration, as there will be more reboots and anxious moments.

- I did not realize that the EISY now forces you to use port 8080 for http access to the unit rather than port 80.  Unfortunately, I have numerous outside integrations using REST and such that all needed to be changed manually. For example, from "http://10.20.30.xx/rest/programs" to  "http://10.20.30.xx:8080/rest/programs".

- I did not realize that the EISY would break my integration with Homebridge, in which I used the ISYMaker and isy-njs plugins.  This means it also broke my integrations with HomeKit and HomeKit automations. (And when a HomeKit device goes missing, a HomeKit automation using the device is automatically deleted, so it's a real pain to recreate them). These plugins simply would not work for me (and they are no longer being supported), even after changing the port to 8080.  I am now implementing Home Assistant instead. So far, I can do everything I need to do in HA, and it's actually better in some ways as others have pointed out on this forum.

- The experience with PG3 has been good.  In many ways, I even prefer the experience with the Elk server to the old integrated experience. However, I was on an old version of PG2. So, migration was not available -- no problem.  But delete your old PG2 servers before you install any PG3 ones. Also, PG2 authentication was not integrated with ISY, as it is now for EISY.  So, your old PG2 password may not work on PG3.  Use your EISY password to log in to PG3. Magically, many of my polyglot devices were preserved in the transition, in my programs, which reduced the editing task.

- Be sure that you first do an export of all of your programs into a text file. This made editing programs for replaced devices so much easier. 

- A minor pain updating the network resources.  Click on them to open in edit mode, then click save, then click save again at the bottom of the list of resources.  I did this for each one just to make sure each was saved after I opened it. That was all that was needed.