@chris Fwiw, I managed to bring the device online, but only by hacking around in the source further. First of all, I manually selected a channel (11) and restarted the device. That seemed to do something different and in the logs I then found more, including this:
2018-09-20 01:56:04.746 [DEBUG] [e.ember.internal.ash.AshFrameHandler] - TX EZSP: EzspFormNetworkRequest [parameters=EmberNetworkParameters [extendedPanId=9718C936F401670F, panId=65535, radioTxPower=255, radioChannel=11, joinMethod=EMBER_USE_MAC_ASSOCIATION, nwkManagerId=65535, nwkUpdateId=0, channels=00000800]]
2018-09-20 01:56:04.749 [DEBUG] [e.ember.internal.ash.AshFrameHandler] - --> TX ASH frame: AshFrameData [frmNum=1, ackNum=4, reTx=false, data=93 00 1E 0F 67 01 F4 36 C9 18 97 FF FF FF 0B 00 FF FF 00 00 08 00 00]
2018-09-20 01:56:04.860 [DEBUG] [e.ember.internal.ash.AshFrameHandler] - <-- RX ASH frame: AshFrameData [frmNum=4, ackNum=2, reTx=false, data=93 80 1E 70]
2018-09-20 01:56:04.864 [DEBUG] [e.ember.internal.ash.AshFrameHandler] - ASH: Frame acked and removed AshFrameData [frmNum=1, ackNum=4, reTx=false, data=93 00 1E 0F 67 01 F4 36 C9 18 97 FF FF FF 0B 00 FF FF 00 00 08 00 00]
2018-09-20 01:56:04.868 [DEBUG] [e.ember.internal.ash.AshFrameHandler] - RX EZSP: EzspFormNetworkResponse [status=EMBER_INVALID_CALL]
It seems that panID was always being set to 65535, even though I entered different values. I made a change in ZigBeeCoordinatorHandler.java around line 147 to set it to 0xfffe instead because the logs showed it was executing that branch and using 0xffff there though. That was just a guess, but the right one apparently: It seems that the device does not like 0xffff as a panId.
After I made that change and yet again reinitialized the device, the device came online. I then searched for the bulb (the Innr one) and it was found, colors, switching, etc. all works!
I think we just need to figure out now what steps are required to properly initialize this stick from the start. I’ll be happy to help with that tomorrow and investigate further, for now I need some sleep