Connect to a node already connected to about python-p2p-network

[macsnoeren]

Within Blockchain you form a network between the nodes. When nodeA and nodeB are connected somehow (inbound or outbound), they already have a connection together within this network. This connection is bi-directional. Both nodes are able to start communication with each other. So, there is no need to make on TCP/IP level two connections. Another aspect is, when allowing two TCP/IP connections between the same nodes, it makes things more complex than needed. Thus, for the blockchain network you just need a connection between the two. How this has been established is not relevant.

[macsnoeren]

Now your question "If in the previous setup a nodeB calls send_to_nodes, will it reach nodeA?". In this case ... no ... but you can implement this. It is application specific. This Python library tends to be a framework in which you can implement peer-to-peer decentralized applications. In your example, you can implement that nodeB relays the message to nodeA. In fact, within peer-to-peer decentralized application, this is very common to have. For example, you could send a discovery message in order to see how big the network is. If a node gets this discovery message, it should relay it further into the network. To prevent circulation of messages like these, you need to do some administration.

[macsnoeren]

I assume your question has been answered ;).