OK got it !!! It was a combination of more failures - with the main one not having read the name of the status message carefully enough : ItemStateChanged(!!!)Event. So as long as battery level is the same ...
@TimO said in Openhab multiple gateways:
@niccodemi yes, you need to use different names for different things in Openhab. Name it as you like.
The node id is unique per gateway, so you may use the same node id on different gateways/networks.
I have problem with 2 MQTT gateways, mysensors binding prasing only one mqtt topic. Also in new OH2.5 is problem selecting Mysensors Mqtt Gateway.
Found a work around. Instead of configuring the things in PaperUI, I configure the MQTT Gateway and the sensor through the openHab things file. I followed the example that @dakipro wrote in the openHab controller main Web page (https://www.mysensors.org/controller/openhab). Thanks @dakipro.