Please read carefully documentation for HA. https://www.home-assistant.io/integrations/mysensors/
You need to send initial state of your sensors. There is example code for doing it. Basically you check in loop if the node just started and send some values to HA. After that your sensor will appear in HA.
I have encountered the same situation trying to use a switch to control some blinds.
Has there been any update on this issue from either Home Assistant or MySensors, or any workaround developed?
Same issue here. HA receives data from Ethernet Gateway for only a few minutes and then:
DEBUG (MainThread) [mysensors.gateway_tcp] Connection lost with <_SelectorSocketTransport closing fd=42 read=idle write=<idle, bufsize=0>>
I also have MYSController connected to the GW and it remains connected. There is an open issue as others are also having the same problem. Am wondering if anyone here is having success with Ethernet Gateway connected to HA.