I have been looking at the Rapi for the OpenEVSE is it possible to send a HTTP Rapi command to enable “eco/solar” mode?
Also they is a dead link on the page
RAPI
RAPI commands can be used to control and check the status of all OpenEVSE functions. RAPI commands can be issued via the direct serial, web-interface, HTTP and MQTT. We recommend using RAPI over MQTT.
A full list of RAPI commands can be found in the OpenEVSE plus source code.