What he is looking at is a crossed Remote Server setup. He wants to have its DTT channels from box A in box B (so watching the channels through streaming), and the DVB-S channels from B into box A so watching them with streaming accross his LAN.
So probably via a plugin like: enigma2-plugin-extensions-remotechannelstreamconverter will do the job for him.
So monassat
- install the plugin enigma2-plugin-extensions-remotechannelstreamconverter
But there is a limitation if you plan to use both STB to watch TV at the same time you will only be able to watch the channels from the same Transpondeur remotely has the one that act has a server is watching or recording (this is true if you have a basic setup). So it is better to have the remote box in standby when watching channels from it.
So for testing always ensure to standby the "server" box to test the different channels.