I can confirm that Drobo5N2 and Drobo5N also are showing similar issues when installed with 1.13.6.5339-115f087d6 in terms of being “available”.
Previously I had 1.13.4.5271 installed and earlier versions did not have these issues.
However, I believe that the root cause is that the process running on all Linux OS based architectures (x86, x64, ARM) is actually stopping on its own in less than 1 minute.
Why do I come to this hypothesis?
Using the Windows-based Drobo Dashboard app, after installing the latest app and starting PMS 1.13.6.5339-115f087d6,the Drobo Dashboard would show that the app was not actually running after about 35 seconds, but was definitely running for the first 30 seconds. (Time confirmed by refreshing the PMS app status window within the Drobo Dashboard).
This also corresponds to the fact that the Drobo5N2 and Drobo5N would show up as available on my local network (didn’t check internet) for about 30 seconds after I pressed start on the Plex app start button in Drobo Dashboard, but then would stop showing up as being available shortly there after.
After the PMS app stops, neither the Drobo5N nor Drobo5N2 show up as being available on my local network (Ethernet) or over the internet.
My two x64 Windows 10 64-bit based PCs running the latest version PMS 1.13.6.5339 do not have these issues thankfully. Once PMS starts, it keeps running and show up as being available both locally as well as over the internet.
For any other Drobo users that might be curious, I am running 3.2.0 [99430] of Drobo Dashboard on my Windows 10 PCs.
My Drobo5N is running “firmware” version: 3.5.16-8.109.96116.
My Drobo5N2 is running “firmware” version: 4.0.5-13.28.96115.
Not sure what Linux kernel those firmware numbers correspond to that are both running on these ARM-based NAS machines.
After performing an “update” using the Drobo Dashboard to the Drobo5N, it reverts to Version 1.13.2.5154 and of course stops complaining that the app needs to be updated (a totally different issue that Drobo needs to work out in the Drobo Dashboard) but the PMS app has been running on the Drobo5N for hours now.
I hope this insight helps.