Is Conman an addon? if so, just uninstall it
How did you conclude that connman generates "millions of requests"? That sounds more like a DoS attempt to me.
connman is the connection manager that I'd integral to LibreELEC. It might be possible to disable it but I would advise against it. I would have a guess that something else is broken unless you can prove it is actually connman.
Connman is integral to networking in our OS and something is abnormal for it to generate that many requests. If possible please capture and share a pcap of the box coming on to the network along with the system journal log for that boot.
Seems you are blocking request to status.html which is how connman get's online status. It is designed this way and disabling causes troubles (as you just find out).
Obviously sending requests in a loop is not nice from connman.
cp /etc/connman/main.conf /storage/.config/connman_main.conf^ now edit EnableOnlineCheck to false and it will not perform the check. However, reading the text in the file it will remain in READY state and may not go ONLINE automatically. I'm not sure what the implications of that are (and I'm not near a box to test).
chewitt. You are my Hero now 
I knew about that "main.conf" thing but i dont knew how about to change it in the readonly system of libreelec. now the connman is silence. I will test what is going on now without the check.
the config files in the ".config" outdoes the ones in the program directorys?
Many thanks to all people that wanted to help me!
One of the connman devs has confirmed that READY and ONLINE are basically the same; only with ONLINE you know it's capable of reaching the public internet without proxies, captive portals etc. in the way. Not relevant for your needs but something I'll bank in the brain. I forget why I added the connman_main.conf trick now, but glad it's come in useful eventually
Things that override in /storage/.config are limited - it's not everything but most of the useful ones.