This is a peer-to-peer (P2P) group message application based on TCP. Group members are "nodes" where every node is an instance of the program (node.py) and acts as both server and client. Groups are formed by invitations and each member only maintains connections with its invited members and the member that invited it. The first member of a group has no inviter. A group's topology is a tree and messages are relayed by nodes on the tree.

There are two modes of usage: GUI and CLI. GUI supports one-line messages (including empty lines) while CLI only supports non-empty one-line messages because empty lines are used to signal termination. The encoded line (including a header) must not exceed 128 bytes. Otherwise, only the first 128 bytes will be relayed.

Run python3 node.py to see the usage (command line arguments). See test.py for multi-node examples.

python3 test.py

• Python >= 3.10
• IPv4 (it should be easy to change it to IPv6 or both)

Packets (over TCP) are of fixed-length (128 bytes).

The disconnection of one node may split the group (tree) into multiple smaller groups.

Encryption and NAT hole punching are currently not supported.