Yeah, well they should have made the iBoost+ IoT capable like some other manufacturers. I have an iBoost+ and on Agile its annoying that it kicks in when exporting from my battery (I have the differential set to max of 500W, but thats not enough). I asked the manufacturer if they could do a firmware/software update that would allow it to stop kicking in on a schedule, but apparently thats not possible (wait for the next hardware version is what they said, yeah like I'm going to pay them again...).
I installed the WiFi enabled switch below which uses the Toya App a few weeks ago. Says its suitable for up to 3kWh immersion load. It's worked well so far, but guess time will tell... Of course I'm not recommending it, install at your own risk!
https://companyblue.co.uk/products/wifi-timer-fused-spur-wall-controller-electric-towel-rail?variant=16979543162951
P.S. I notice ALL the reviews on Marlec web site for their iBoost+ are 5. I left a 4 review on the basis it works really well, except this issue. They haven't published it!