diff --git a/src/modules/room/RoomChatForm.tsx b/src/modules/room/RoomChatForm.tsx
index c279494..7b31a94 100644
--- a/src/modules/room/RoomChatForm.tsx
+++ b/src/modules/room/RoomChatForm.tsx
@@ -2,7 +2,7 @@ import { FC } from "react";
 import { Form, Field } from "react-final-form";
 import { useDispatch } from "react-redux";
 
-import { roomMessage } from "modules/room/slice";
+import { roomSendMessage } from "modules/room/slice";
 
 interface Props {
   roomName: string;
@@ -18,7 +18,7 @@ const RoomChatForm: FC<Props> = ({ roomName, loginUserName }) => {
 
   const onSubmit = ({ message }: Fields, form: any) => {
     dispatch(
-      roomMessage({
+      roomSendMessage({
         roomName,
         userName: loginUserName,
         message,
diff --git a/src/modules/room/message.ts b/src/modules/room/message.ts
index eb97709..01d85c6 100644
--- a/src/modules/room/message.ts
+++ b/src/modules/room/message.ts
@@ -1,53 +1,107 @@
 import { AppDispatch } from "app/store";
-import { roomMessage, roomGetAll, roomSetAll } from "modules/room/slice";
+import {
+  RoomMembership,
+  RoomMessagePayload,
+  RoomState,
+  roomReceiveMessage,
+  roomSendMessage,
+  roomGetAll,
+  roomSetAll,
+} from "modules/room/slice";
 import { SocketMessage, SocketMessageMiddleware } from "modules/socket/message";
 
 function roomListRequest(): SocketMessage {
   return "RoomListRequest";
 }
 
-// TODO: Adapt to new response format.
-function handleRoomListResponse(dispatch: AppDispatch, outerFields: any[]) {
-  if (outerFields.length !== 1) {
-    console.log("RoomListResponse has wrong number of fields:", outerFields);
-    return;
+function roomMessageRequest({ roomName, message }: RoomMessagePayload) {
+  return {
+    RoomMessageRequest: {
+      room_name: roomName,
+      message,
+    },
+  };
+}
+
+function convertMembership(membership: string): RoomMembership {
+  switch (membership) {
+    case "NonMember":
+      return RoomMembership.Left;
+    case "Joining":
+      return RoomMembership.Joining;
+    case "Member":
+      return RoomMembership.Joined;
+    case "Leaving":
+      return RoomMembership.Leaving;
   }
+}
 
-  const { rooms } = outerFields[0];
-  if (rooms === undefined) {
-    console.log("RoomListResponse field has wrong shape:", outerFields[0]);
-    return;
+function convertMessages(messages: any[]): RoomMessage[] {
+  const result = [];
+  for (const message of messages) {
+    result.push({
+      userName: message.user_name,
+      message: message.message,
+    });
   }
+  return result;
+}
 
-  dispatch(roomSetAll(rooms));
+function convertRoomListEntry(name: string, room: any): RoomState {
+  return {
+    name,
+    membership: convertMembership(room.membership),
+    visibility: room.visibility,
+    operated: room.operated,
+    userCount: room.user_count,
+    owner: room.owner,
+    operators: room.operators,
+    members: room.members,
+    messages: convertMessages(room.messages),
+    tickers: room.tickers,
+  };
 }
 
-// TODO: Adapt to new response format.
-function handleRoomMessageResponse(dispatch: AppDispatch, outerFields: any[]) {
-  if (outerFields.length !== 1) {
-    console.log("RoomMessageResponse has wrong number of fields:", outerFields);
+function handleRoomListResponse(dispatch: AppDispatch, response) {
+  const { rooms } = response;
+  if (rooms === undefined) {
+    console.log("RoomListResponse has wrong shape:", response);
     return;
   }
 
-  dispatch(roomMessage(outerFields[0]));
+  const map = {};
+  for (const [name, room] of rooms) {
+    map[name] = convertRoomListEntry(name, room);
+  }
+
+  dispatch(roomSetAll(map));
+}
+
+function handleRoomMessageResponse(dispatch: AppDispatch, response) {
+  dispatch(
+    roomReceiveMessage({
+      roomName: response.room_name,
+      userName: response.user_name,
+      message: response.message,
+    })
+  );
 }
 
 export const roomSocketMessageMiddleware: SocketMessageMiddleware = {
   // TODO: Adapt to new response format.
-  handleMessage: (dispatch, { variant, fields }) => {
-    switch (variant) {
-      case "RoomListResponse":
-        handleRoomListResponse(dispatch, fields);
-        break;
-      case "RoomMessageResponse":
-        handleRoomMessageResponse(dispatch, fields);
-        break;
+  handleMessage: (dispatch, message) => {
+    if ("RoomListResponse" in message) {
+      handleRoomListResponse(dispatch, message["RoomListResponse"]);
+    } else if ("RoomMessageResponse" in message) {
+      handleRoomMessageResponse(dispatch, message["RoomMessageResponse"]);
     }
   },
 
   handleAction: (send, action) => {
     if (roomGetAll.match(action)) {
       send(roomListRequest());
+    } else if (roomSendMessage.match(action)) {
+      send(roomMessageRequest(action.payload));
     }
   },
 };
diff --git a/src/modules/room/slice.ts b/src/modules/room/slice.ts
index 267595e..63cd3d9 100644
--- a/src/modules/room/slice.ts
+++ b/src/modules/room/slice.ts
@@ -24,7 +24,7 @@ export interface RoomState {
   operators: string[];
   members: string[];
   messages: RoomMessage[];
-  tickers: string[];
+  tickers: [string, string][];
   // showUsers: boolean;
 }
 
@@ -99,7 +99,7 @@ export const roomSlice = createSlice({
 
       room.membership = membership;
     },
-    roomMessage: (
+    roomReceiveMessage: (
       state: RoomSliceState,
       action: PayloadAction<RoomMessagePayload>
     ) => {
@@ -115,6 +115,21 @@ export const roomSlice = createSlice({
 
       room.messages.push({ userName, message });
     },
+    roomSendMessage: (
+      state: RoomSliceState,
+      action: PayloadAction<RoomMessagePayload>
+    ) => {
+      const { roomName, userName, message } = action.payload;
+      const room = state.rooms[roomName];
+      if (room === undefined) {
+        console.log(
+          `Cannot send message to unknown room ${roomName}: ${message}`
+        );
+        return;
+      }
+
+      room.messages.push({ userName, message });
+    },
     roomSetAll: (state: RoomSliceState, action: PayloadAction<Room[]>) => {
       state.rooms = {};
       for (const room of action.payload) {
@@ -125,8 +140,13 @@ export const roomSlice = createSlice({
   },
 });
 
-export const { roomSetMembership, roomMessage, roomGetAll, roomSetAll } =
-  roomSlice.actions;
+export const {
+  roomSetMembership,
+  roomReceiveMessage,
+  roomSendMessage,
+  roomGetAll,
+  roomSetAll,
+} = roomSlice.actions;
 
 export function selectAllRooms(state: RootState): RoomMap {
   return state.rooms.rooms;
diff --git a/src/modules/socket/message.ts b/src/modules/socket/message.ts
index 79da047..71694a3 100644
--- a/src/modules/socket/message.ts
+++ b/src/modules/socket/message.ts
@@ -5,10 +5,7 @@ import { PayloadAction } from "@reduxjs/toolkit";
 import { AppDispatch } from "app/store";
 
 // The type of a message exchanged over a websocket.
-export interface SocketMessage {
-  variant: string;
-  fields: any[];
-}
+export type SocketMessage = any;
 
 // Serializes the given message for sending over the wire.
 export function serializeMessage(message: SocketMessage): string {
@@ -18,12 +15,7 @@ export function serializeMessage(message: SocketMessage): string {
 // Attempts to parse a message out of the given data.
 // Throws an error if unsuccessful.
 export function parseMessage(serialized: string): SocketMessage {
-  const { variant, fields } = JSON.parse(serialized);
-  if (typeof variant === "undefined") {
-    throw new Error('Missing "variant" field in socket message');
-  }
-
-  return { variant, fields };
+  return JSON.parse(serialized);
 }
 
 // An interface passed to socket message middleware, used to send messages.