Feed In Mode Indication

[AndyBowden]

I've just observed that a parameter 'emsWorkMode' in the JTS1_EMS_HEARTBEAT report, takes value 0 normally, but 1 when my dual inverter single phase Power Ocean System is in feed-in mode.
I'm not aware of any existing parameter read by this integration which gives a feed-in mode indication.
I will publish a new 86.json file when I've done some further checks.