Zigbee parent device ID FFFF, no device with that ID

Lately I’ve had a lot of users having issues with their Sylvania lights falling off their ZigBee network. When they rejoin the bulb to the network it’s parent ID is from a device that isn’t on their network. I first assume these devices are connecting to previously paired device but I’ve seen multiple users Osram device connecting to the same parent ID FFFF. Any idea what this is?

zbjoin: {“dni”:“BD14”,“d”:“84182600000DC372”,“capabilities”:“8E”,“endpoints”:[{“simple”:“03 0104 0101 02 07 0000 0003 0004 0005 0006 0008 FC0F 01 0019”,“application”:“01”,“manufacturer”:“OSRAM”,“model”:“LIGHTIFY A19 ON/OFF/DIM”}],“parent”:“FFFF”,“joinType”:255}

zbjoin: {“dni”:“64D1”,“d”:“84182600000DC7DE”,“capabilities”:“8E”,“endpoints”:[{“simple”:“03 0104 0101 02 07 0000 0003 0004 0005 0006 0008 FC0F 01 0019”,“application”:“01”,“manufacturer”:“OSRAM”,“model”:“LIGHTIFY A19 ON/OFF/DIM”}],“parent”:“FFFF”,“joinType”:255}

I’ve also seen this with other manufacture’s devices.

Could parent FFFF be the hub itself?

The hub has

Node ID: 0000

This is the default ID correct?

Hope this is useful - from @tpmanley - a great developer!

So - it’s probably because the Osrams can serve as repeaters. (“Router” = “Repeater” in Zigbee terminology)

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Thank you, very helpful :grinning: