{
    "content": {
        "join_rule": "public"
    },
    "event_id": "$151957878231iejdB:localhost",
    "origin_server_ts": 1519578782192,
    "sender": "@example:localhost",
    "state_key": "",
    "type": "m.room.join_rules",
    "unsigned": {
      "age": 1392989713
    }
}