How to "Use a device override to define the device type"?

Configuration
1

Using HA .89, with an insteon PLM, trying to link it to a wall switch.

In the HA logs I get:
2019-03-10 18:50:21 WARNING (MainThread) [insteonplm.devices] Device 3C.EF.62 returned a pre-NAK message
2019-03-10 18:50:21 WARNING (MainThread) [insteonplm.devices] Checking status to confirm if message was processed
2019-03-10 18:50:27 WARNING (MainThread) [insteonplm.devices] Device 3C.EF.62 did not respond to an ID request
2019-03-10 18:50:27 WARNING (MainThread) [insteonplm.devices] Use a device override to define the device type

I have seen documentation about device class, but nothing about device type. Does anyone know about the syntax for making a manual entry for this? Using
insteon:
device_override:

  • address: 3C.EF.62
    doesn’t seem to work.
2 
insteon:
  port: /dev/ttyUSB0
  device_override:
    - address: 1a2b3c
      cat: 0x12
      subcat: 0xab