We should be able to connect directly to the EmonTX (with EmonESP) from the OpenEVSE via the WebSockets and grab the data directly from that with out the need for an external MQTT server. This should be more cost effective and easier to setup compared with an EmonPi for simpler use-cases where just trying to do PV divert and/or grid limiting.
This would also be improved by doing an EmonTX with WiFi directly on board and no RFM69.
Actually, really what we want for Solar divert / Grid limiting is current, voltage is only needed co convert back to current from power, but I guess that is a separate issue from this.
We should be able to connect directly to the EmonTX (with EmonESP) from the OpenEVSE via the WebSockets and grab the data directly from that with out the need for an external MQTT server. This should be more cost effective and easier to setup compared with an EmonPi for simpler use-cases where just trying to do PV divert and/or grid limiting.
This would also be improved by doing an EmonTX with WiFi directly on board and no RFM69.