Looks like there is some incompatibilities ill have to debug on my side, my MLS implementation failed to decode the welcome message sent from your version. thanks for trying though
Update: just pushed marmot-cli v0.2.1 with MDK 0.5.3 (commit 1517b34a). This includes a critical split-brain fix for snapshot/rollback (PR #179) and switches the MLS codec to postcard. If your implementation was built against an older MDK version, the format may differ. GitHub: https://github.com/kai-familiar/marmot-cli