[mh] Insteon PLM scene issue

Hi folks,

I recently had an issue with my 13 year old PLM 2413U where 
communication with other devices on my Insteon network become 
increasingly unreliable, and ultimately ended up re-capping the PLM. 
This seems to have otherwise restored the functionality of the PLM and 
now controlling all of my devices is working again, but I have one 
remaining issue with scenes that I can't track down. Scenes in MH had 
been working prior to the PLM starting to exhibit issues, so I'm not 
quite sure what might have changed to cause this. The error suggests 
that the PLM no longer has a link defined, but sync links was run just 
prior and suggests the link is present.

MHT extract:

/INSTEON_SWITCHLINC, 43.2C.E3, upstairs_sconce_light, Lights|Upstairs # 
the upstairs stairway sconce light//
//INSTEON_SWITCHLINC, 43.35.95, downstairs_sconce_light, 
Lights|Downstairs # the downstairs stairway sconce light//
//# Link the upstairs and downstairs staircase sconce lights together//
//INSTEON_ICONTROLLER, A1, sconce_lights, Lights|Scenes//
//SCENE_BUILD, sconce_lights, downstairs_sconce_light,   1, 1, 100%, 0.5s//
//SCENE_BUILD, sconce_lights, upstairs_sconce_light,     1, 1, 100%, 0.5s/

Log links extract after syncing links:

11/25/2022 14:39:23  [Insteon::ALDB_PLM] responder record to 
$upstairs_sconce_light(01) (d1=00, d2=00, d3=00)
11/25/2022 14:39:23  [Insteon::ALDB_PLM] cntlr($sconce_lights (a1)) 
record to $upstairs_sconce_light (d1=01, d2=00, d3=a1)
11/25/2022 14:39:23  [Insteon::ALDB_PLM] responder record to 
$downstairs_sconce_light(01) (d1=00, d2=00, d3=00)
11/25/2022 14:39:23  [Insteon::ALDB_PLM] cntlr($sconce_lights (a1)) 
record to $downstairs_sconce_light (d1=01, d2=00, d3=a1)

Attempts to control:

11/25/2022 14:40:04  Running: sconce lights on
11/25/2022 14:40:04  [Insteon_PLM] WARN: PLM ALDB does not have a link 
for this scene defined: obj=$sconce_lights; command=on; extra=00
11/25/2022 14:40:24  Running: sconce lights sync links
11/25/2022 14:40:25  [Insteon::BaseController] Completed sync links for: 
$sconce_lights
11/25/2022 14:40:44  Running: sconce lights off
11/25/2022 14:40:44  [Insteon_PLM] WARN: PLM ALDB does not have a link 
for this scene defined: obj=$sconce_lights; command=off; extra=00

However, if I attempt to scan the PLM link table and then log links I 
get this:

11/26/2022 12:06:11  Running: PLM plm - scan PLM link table
11/26/2022 12:06:12  [Insteon::ALDB_PLM] Link table health: empty

11/26/2022 12:20:47  Running: PLM plm - log links
11/26/2022 12:20:47  [Insteon::ALDB_PLM] Link table health: empty

Has anyone seen something like this before? It suggests there is an 
EEPROM on the PLM that may have failed as well.

PLMs are still in short supply, and it looks like the Insteon Hub v2 
doesn't support the raw TCP PLM interface that the Hub v1 had, so it 
might warrant adding support for the new authenticated HTTP method that 
the Hub v2 uses..


TIA!

-Brian

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