I have 5 GWPN6 devices and 4 FGWP101 devices and they all produces these error messages in the openhab.log file.
2016-12-30 20:09:38.841 [ERROR] [ocol.ZWaveController$ZWaveSendThread] - NODE 16: Timeout while sending message. Requeueing - 2 attempts left!
2016-12-30 20:09:38.853 [ERROR] [l.serialmessage.SendDataMessageClass] - NODE 16: Got an error while sending data. Resending message.
2016-12-30 20:09:43.859 [ERROR] [ocol.ZWaveController$ZWaveSendThread] - NODE 16: Timeout while sending message. Requeueing - 1 attempts left!
2016-12-30 20:09:43.861 [ERROR] [l.serialmessage.SendDataMessageClass] - NODE 16: Got an error while sending data. Resending message.
2016-12-30 20:09:48.865 [ERROR] [ocol.ZWaveController$ZWaveSendThread] - NODE 16: Timeout while sending message. Requeueing - 0 attempts left!
2016-12-30 20:09:48.866 [ERROR] [l.serialmessage.SendDataMessageClass] - NODE 16: Got an error while sending data. Resending message.
2016-12-30 20:09:53.874 [WARN ] [ocol.ZWaveController$ZWaveSendThread] - NODE 16: Too many retries. Discarding message: Message: class=SendData[0x13], type=Request[0x00], priority=Get, dest=16, callback=14, payload=10 03 71 04 00
Saw the same issue for another device here
https://community.openhab.org/t/zwave-questions/12809
Chris, is this a polling issue as well?
Everything is working with the devices. I get the power, energy updates and I can switch them on/off.