diff --git a/chat-android/src/main/java/com/ably/chat/ChatClient.kt b/chat-android/src/main/java/com/ably/chat/ChatClient.kt
index 6a1d06d..e65e617 100644
--- a/chat-android/src/main/java/com/ably/chat/ChatClient.kt
+++ b/chat-android/src/main/java/com/ably/chat/ChatClient.kt
@@ -1,7 +1,8 @@
+@file:Suppress("StringLiteralDuplication", "NotImplementedDeclaration")
+
 package com.ably.chat
 
 import io.ably.lib.realtime.AblyRealtime
-import io.ably.lib.types.ClientOptions
 
 typealias RealtimeClient = AblyRealtime
 
@@ -35,3 +36,26 @@ interface ChatClient {
      */
     val clientOptions: ClientOptions
 }
+
+fun ChatClient(realtimeClient: RealtimeClient, clientOptions: ClientOptions): ChatClient = DefaultChatClient(realtimeClient, clientOptions)
+
+internal class DefaultChatClient(
+    override val realtime: RealtimeClient,
+    override val clientOptions: ClientOptions,
+) : ChatClient {
+
+    private val chatApi = ChatApi(realtime)
+
+    override val rooms: Rooms = DefaultRooms(
+        realtimeClient = realtime,
+        chatApi = chatApi,
+        clientOptions = clientOptions,
+        clientId = clientId,
+    )
+
+    override val connection: Connection
+        get() = TODO("Not yet implemented")
+
+    override val clientId: String
+        get() = realtime.auth.clientId
+}
diff --git a/chat-android/src/main/java/com/ably/chat/Messages.kt b/chat-android/src/main/java/com/ably/chat/Messages.kt
index a43259c..8bc9241 100644
--- a/chat-android/src/main/java/com/ably/chat/Messages.kt
+++ b/chat-android/src/main/java/com/ably/chat/Messages.kt
@@ -1,3 +1,5 @@
+@file:Suppress("StringLiteralDuplication", "NotImplementedDeclaration")
+
 package com.ably.chat
 
 import io.ably.lib.realtime.Channel
@@ -173,3 +175,53 @@ data class SendMessageParams(
      */
     val headers: MessageHeaders? = null,
 )
+
+class DefaultMessages(
+    private val roomId: String,
+    private val clientId: String,
+    private val realtimeClient: RealtimeClient,
+    private val chatApi: ChatApi,
+) : Messages {
+
+    /**
+     * the channel name for the chat messages channel.
+     */
+    private val messagesChannelName = "$roomId::\$chat::\$chatMessages"
+
+    override val channel: Channel
+        get() = realtimeClient.channels.get(messagesChannelName, ChatChannelOptions())
+
+    override fun subscribe(listener: Messages.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override fun unsubscribe(listener: Messages.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun get(options: QueryOptions): PaginatedResult<Message> {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun send(params: SendMessageParams): Message {
+        return chatApi.sendMessage(roomId, params).let {
+            Message(
+                timeserial = it.timeserial,
+                clientId = clientId,
+                roomId = roomId,
+                text = params.text,
+                createdAt = it.createdAt,
+                metadata = params.metadata ?: mapOf(),
+                headers = params.headers ?: mapOf(),
+            )
+        }
+    }
+
+    override fun onDiscontinuity(listener: EmitsDiscontinuities.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override fun offDiscontinuity(listener: EmitsDiscontinuities.Listener) {
+        TODO("Not yet implemented")
+    }
+}
diff --git a/chat-android/src/main/java/com/ably/chat/Occupancy.kt b/chat-android/src/main/java/com/ably/chat/Occupancy.kt
index 0ebe721..62a6bb0 100644
--- a/chat-android/src/main/java/com/ably/chat/Occupancy.kt
+++ b/chat-android/src/main/java/com/ably/chat/Occupancy.kt
@@ -1,3 +1,5 @@
+@file:Suppress("StringLiteralDuplication", "NotImplementedDeclaration")
+
 package com.ably.chat
 
 import io.ably.lib.realtime.Channel
@@ -63,3 +65,30 @@ data class OccupancyEvent(
      */
     val presenceMembers: Int,
 )
+
+internal class DefaultOccupancy(
+    private val messages: Messages,
+) : Occupancy {
+    override val channel: Channel
+        get() = messages.channel
+
+    override fun subscribe(listener: Occupancy.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override fun unsubscribe(listener: Occupancy.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun get(): OccupancyEvent {
+        TODO("Not yet implemented")
+    }
+
+    override fun onDiscontinuity(listener: EmitsDiscontinuities.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override fun offDiscontinuity(listener: EmitsDiscontinuities.Listener) {
+        TODO("Not yet implemented")
+    }
+}
diff --git a/chat-android/src/main/java/com/ably/chat/Presence.kt b/chat-android/src/main/java/com/ably/chat/Presence.kt
index c2c55b1..ba49296 100644
--- a/chat-android/src/main/java/com/ably/chat/Presence.kt
+++ b/chat-android/src/main/java/com/ably/chat/Presence.kt
@@ -1,3 +1,5 @@
+@file:Suppress("StringLiteralDuplication", "NotImplementedDeclaration")
+
 package com.ably.chat
 
 import android.text.PrecomputedText.Params
@@ -132,3 +134,47 @@ data class PresenceEvent(
      */
     val data: PresenceData,
 )
+
+internal class DefaultPresence(
+    private val messages: Messages,
+) : Presence {
+
+    override val channel: Channel
+        get() = messages.channel
+
+    override suspend fun get(params: List<Params>): List<PresenceMember> {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun isUserPresent(clientId: String): Boolean {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun enter(data: PresenceData?) {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun update(data: PresenceData?) {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun leave(data: PresenceData?) {
+        TODO("Not yet implemented")
+    }
+
+    override fun subscribe(listener: Presence.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override fun unsubscribe(listener: Presence.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override fun onDiscontinuity(listener: EmitsDiscontinuities.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override fun offDiscontinuity(listener: EmitsDiscontinuities.Listener) {
+        TODO("Not yet implemented")
+    }
+}
diff --git a/chat-android/src/main/java/com/ably/chat/Room.kt b/chat-android/src/main/java/com/ably/chat/Room.kt
index 3f6616e..7ce66b8 100644
--- a/chat-android/src/main/java/com/ably/chat/Room.kt
+++ b/chat-android/src/main/java/com/ably/chat/Room.kt
@@ -1,3 +1,5 @@
+@file:Suppress("StringLiteralDuplication", "NotImplementedDeclaration")
+
 package com.ably.chat
 
 /**
@@ -80,3 +82,53 @@ interface Room {
      */
     suspend fun detach()
 }
+
+internal class DefaultRoom(
+    override val roomId: String,
+    override val options: RoomOptions,
+    realtimeClient: RealtimeClient,
+    chatApi: ChatApi,
+    clientId: String,
+) : Room {
+
+    override val messages: Messages = DefaultMessages(
+        roomId = roomId,
+        realtimeClient = realtimeClient,
+        chatApi = chatApi,
+        clientId = clientId,
+    )
+
+    override val presence: Presence = DefaultPresence(
+        messages = messages,
+    )
+
+    override val reactions: RoomReactions = DefaultRoomReactions(
+        roomId = roomId,
+        realtimeClient = realtimeClient,
+    )
+
+    override val typing: Typing = DefaultTyping(
+        roomId = roomId,
+        realtimeClient = realtimeClient,
+    )
+
+    override val occupancy: Occupancy = DefaultOccupancy(
+        messages = messages,
+    )
+
+    override val status: RoomStatus get() {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun attach() {
+        messages.channel.attachCoroutine()
+        typing.channel.attachCoroutine()
+        reactions.channel.attachCoroutine()
+    }
+
+    override suspend fun detach() {
+        messages.channel.detachCoroutine()
+        typing.channel.detachCoroutine()
+        reactions.channel.detachCoroutine()
+    }
+}
diff --git a/chat-android/src/main/java/com/ably/chat/RoomReactions.kt b/chat-android/src/main/java/com/ably/chat/RoomReactions.kt
index 3ced2e2..f3a2d58 100644
--- a/chat-android/src/main/java/com/ably/chat/RoomReactions.kt
+++ b/chat-android/src/main/java/com/ably/chat/RoomReactions.kt
@@ -1,3 +1,5 @@
+@file:Suppress("StringLiteralDuplication", "NotImplementedDeclaration")
+
 package com.ably.chat
 
 import io.ably.lib.realtime.Channel
@@ -100,3 +102,33 @@ data class SendReactionParams(
      */
     val headers: ReactionHeaders? = null,
 )
+
+internal class DefaultRoomReactions(
+    roomId: String,
+    private val realtimeClient: RealtimeClient,
+) : RoomReactions {
+    private val roomReactionsChannelName = "$roomId::\$chat::\$reactions"
+
+    override val channel: Channel
+        get() = realtimeClient.channels.get(roomReactionsChannelName, ChatChannelOptions())
+
+    override suspend fun send(params: SendReactionParams) {
+        TODO("Not yet implemented")
+    }
+
+    override fun subscribe(listener: RoomReactions.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override fun unsubscribe(listener: RoomReactions.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override fun onDiscontinuity(listener: EmitsDiscontinuities.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override fun offDiscontinuity(listener: EmitsDiscontinuities.Listener) {
+        TODO("Not yet implemented")
+    }
+}
diff --git a/chat-android/src/main/java/com/ably/chat/Rooms.kt b/chat-android/src/main/java/com/ably/chat/Rooms.kt
index e4fd7ff..b860fbf 100644
--- a/chat-android/src/main/java/com/ably/chat/Rooms.kt
+++ b/chat-android/src/main/java/com/ably/chat/Rooms.kt
@@ -1,5 +1,8 @@
 package com.ably.chat
 
+import io.ably.lib.types.AblyException
+import io.ably.lib.types.ErrorInfo
+
 /**
  * Manages the lifecycle of chat rooms.
  */
@@ -35,3 +38,43 @@ interface Rooms {
      */
     suspend fun release(roomId: String)
 }
+
+/**
+ * Manages the chat rooms.
+ */
+internal class DefaultRooms(
+    private val realtimeClient: RealtimeClient,
+    private val chatApi: ChatApi,
+    override val clientOptions: ClientOptions,
+    private val clientId: String,
+) : Rooms {
+    private val roomIdToRoom: MutableMap<String, Room> = mutableMapOf()
+
+    override fun get(roomId: String, options: RoomOptions): Room {
+        return synchronized(this) {
+            val room = roomIdToRoom.getOrPut(roomId) {
+                DefaultRoom(
+                    roomId = roomId,
+                    options = options,
+                    realtimeClient = realtimeClient,
+                    chatApi = chatApi,
+                    clientId = clientId,
+                )
+            }
+
+            if (room.options != options) {
+                throw AblyException.fromErrorInfo(
+                    ErrorInfo("Room already exists with different options", HttpStatusCodes.BadRequest, ErrorCodes.BadRequest),
+                )
+            }
+
+            room
+        }
+    }
+
+    override suspend fun release(roomId: String) {
+        synchronized(this) {
+            roomIdToRoom.remove(roomId)
+        }
+    }
+}
diff --git a/chat-android/src/main/java/com/ably/chat/Typing.kt b/chat-android/src/main/java/com/ably/chat/Typing.kt
index c6532af..fa75bc2 100644
--- a/chat-android/src/main/java/com/ably/chat/Typing.kt
+++ b/chat-android/src/main/java/com/ably/chat/Typing.kt
@@ -1,3 +1,5 @@
+@file:Suppress("StringLiteralDuplication", "NotImplementedDeclaration")
+
 package com.ably.chat
 
 import io.ably.lib.realtime.Channel
@@ -77,3 +79,41 @@ interface Typing : EmitsDiscontinuities {
  * Represents a typing event.
  */
 data class TypingEvent(val currentlyTyping: Set<String>)
+
+internal class DefaultTyping(
+    roomId: String,
+    private val realtimeClient: RealtimeClient,
+) : Typing {
+    private val typingIndicatorsChannelName = "$roomId::\$chat::\$typingIndicators"
+
+    override val channel: Channel
+        get() = realtimeClient.channels.get(typingIndicatorsChannelName, ChatChannelOptions())
+
+    override fun subscribe(listener: Typing.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override fun unsubscribe(listener: Typing.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun get(): Set<String> {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun start() {
+        TODO("Not yet implemented")
+    }
+
+    override suspend fun stop() {
+        TODO("Not yet implemented")
+    }
+
+    override fun onDiscontinuity(listener: EmitsDiscontinuities.Listener) {
+        TODO("Not yet implemented")
+    }
+
+    override fun offDiscontinuity(listener: EmitsDiscontinuities.Listener) {
+        TODO("Not yet implemented")
+    }
+}
diff --git a/chat-android/src/main/java/com/ably/chat/Utils.kt b/chat-android/src/main/java/com/ably/chat/Utils.kt
new file mode 100644
index 0000000..5b84ba6
--- /dev/null
+++ b/chat-android/src/main/java/com/ably/chat/Utils.kt
@@ -0,0 +1,45 @@
+package com.ably.chat
+
+import io.ably.lib.realtime.Channel
+import io.ably.lib.realtime.CompletionListener
+import io.ably.lib.types.AblyException
+import io.ably.lib.types.ChannelOptions
+import io.ably.lib.types.ErrorInfo
+import kotlin.coroutines.resume
+import kotlin.coroutines.resumeWithException
+import kotlin.coroutines.suspendCoroutine
+
+suspend fun Channel.attachCoroutine() = suspendCoroutine { continuation ->
+    attach(object : CompletionListener {
+        override fun onSuccess() {
+            continuation.resume(Unit)
+        }
+
+        override fun onError(reason: ErrorInfo?) {
+            continuation.resumeWithException(AblyException.fromErrorInfo(reason))
+        }
+    })
+}
+
+suspend fun Channel.detachCoroutine() = suspendCoroutine { continuation ->
+    detach(object : CompletionListener {
+        override fun onSuccess() {
+            continuation.resume(Unit)
+        }
+
+        override fun onError(reason: ErrorInfo?) {
+            continuation.resumeWithException(AblyException.fromErrorInfo(reason))
+        }
+    })
+}
+
+@Suppress("FunctionName")
+fun ChatChannelOptions(init: (ChannelOptions.() -> Unit)? = null): ChannelOptions {
+    val options = ChannelOptions()
+    init?.let { options.it() }
+    options.params = options.params + mapOf(
+        // TODO replace with the actual version (e.g. using BuildConfig plugin https://github.com/gmazzo/gradle-buildconfig-plugin)
+        "agent" to "chat-js/0.0.0",
+    )
+    return options
+}
diff --git a/detekt.yml b/detekt.yml
index cc8eda1..9a47ad1 100644
--- a/detekt.yml
+++ b/detekt.yml
@@ -999,7 +999,7 @@ style:
   UseCheckOrError:
     active: true
   UseDataClass:
-    active: true
+    active: false
     allowVars: false
   UseEmptyCounterpart:
     active: false