How do Ethereum main chain and SONM sidechain communicate?

Any resources to read about this in more details? Thanks!

Sonm sidechain is something similar to bitcoin lightning network.
You can find more info by reading this article:
https://blog.sonm.io/sonm-is-going-to-build-an-ethereum-sidechain-4590cb3e112c

How do Ethereum main chain and SONM sidechain communicate?

Any resources to read about this in more details? Thanks!

https://cdn-images-1.medium.com/max/1000/1*1FgeHpVRnGcJE8bjEmD-Iw.png

https://blog.sonm.io/sonm-masternodes-details-draft-38edb5c81921

As I understood there will be masternodes to secure and maintain gates between the chains.

Question was about sidechains, not the masternodes. It's not the same.