diff --git a/client/component/src/ConnectedPlot.tsx b/client/component/src/ConnectedPlot.tsx
index ba14b38..828faee 100644
--- a/client/component/src/ConnectedPlot.tsx
+++ b/client/component/src/ConnectedPlot.tsx
@@ -147,12 +147,20 @@ interface ClientScatterParametersMessage {
   pointSize: number;
 }
 
+/**
+ * A client status message
+ */
+interface ClientConfigMessage {
+  config: Map<string, string>;
+}
+
 type ClientMessage =
   | ClientStatusMessage
   | ClientSelectionMessage
   | ClientLineParametersMessage
   | ClientScatterParametersMessage
   | ClearSelectionsMessage
+  | ClientConfigMessage
   | BatonRequestMessage
   | BatonDonateMessage;
 
@@ -224,6 +232,8 @@ interface ConnectedPlotProps {
   hostname?: string;
   /** The port */
   port?: string;
+  /** A configuration map */
+  config?: object;
   /** The universally unique identifier */
   uuid: string;
 }
@@ -238,6 +248,7 @@ function ConnectedPlot({
   plotId = 'plot_0',
   hostname = '127.0.0.1',
   port = '80',
+  config,
   uuid,
 }: ConnectedPlotProps) {
   const [plotProps, setPlotProps] = useState<AnyPlotProps | null>();
@@ -246,6 +257,7 @@ function ConnectedPlot({
     useState<PlotConfig>(defaultPlotConfig);
   const [scatterData, setScatterData] = useState<ScatterData>();
 
+  const [configMap, setConfigMap] = useState(config);
   const mountState = useRef('');
   const plotServerURL = `ws://${hostname}:${port}/plot/${uuid}/${plotId}`;
   const { sendMessage, lastMessage, readyState, getWebSocket } = useWebSocket(
@@ -271,6 +283,10 @@ function ConnectedPlot({
     };
   }, []);
 
+  if (config != configMap) {
+    setConfigMap(config);
+  }
+
   const sendClientMessage = useCallback(
     (data: ClientMessage) => {
       console.log('%s: sending', plotId, data);
@@ -338,6 +354,12 @@ function ConnectedPlot({
     }
   }, [getWebSocket, plotId, readyState, sendStatusMessage]);
 
+  useEffect(() => {
+    if (readyState === ReadyState.OPEN && configMap) {
+      sendClientMessage({config: configMap} as ClientConfigMessage);
+    }
+  }, [readyState, configMap]);
+
   const clearLineData = () => {
     setLineData([]);
     setLinePlotConfig(defaultPlotConfig);
diff --git a/client/example/src/App.tsx b/client/example/src/App.tsx
index a7cc798..73735ff 100644
--- a/client/example/src/App.tsx
+++ b/client/example/src/App.tsx
@@ -131,6 +131,7 @@ class AppMain extends React.Component<AppMainProps, AppMainStates> {
       ...heatmapProps.plotConfig,
       title: 'Sample Heatmap Plot (no toolbar)',
     };
+    const config = {pvName: 'MY_DEVICE'};
 
     const host = import.meta.env.VITE_WS_HOST ?? window.location.hostname;
     const port = import.meta.env.VITE_WS_PORT ?? window.location.port;
@@ -157,6 +158,7 @@ class AppMain extends React.Component<AppMainProps, AppMainStates> {
               uuid={this.uuid}
               hostname={host}
               port={port}
+              config={config}
             />
           </div>
           <div style={{ display: 'grid', height: '49vh' }}>
diff --git a/server/davidia/models/messages.py b/server/davidia/models/messages.py
index e2a2923..4e72a9f 100644
--- a/server/davidia/models/messages.py
+++ b/server/davidia/models/messages.py
@@ -1,3 +1,4 @@
+from pydantic import BaseModel
 from enum import auto
 from typing import Any
 from uuid import uuid4
@@ -343,6 +344,20 @@ class ClearPlotMessage(DvDModel):
 
     plot_id: str
 
+class ConfigModel(DvDModel):
+    """Class for representing any config"""
+
+class EpicsPVAccessConfig(ConfigModel):
+    pvName: str
+
+class ProfileToolConfig(ConfigModel):
+    profile: str
+
+class ClientConfigMessage(DvDModel):
+    """Class for representing a client config"""
+
+    config: EpicsPVAccessConfig | ProfileToolConfig
+
 
 class ClientStatusMessage(DvDModel):
     """Class for representing a client status"""
@@ -375,13 +390,12 @@ class ClientScatterParametersMessage(DvDModel):
 
 
 ClientMessage = (
-    ClientStatusMessage
+    ClearSelectionsMessage
+    | ClientConfigMessage
+    | ClientStatusMessage
     | ClientSelectionMessage
     | ClientLineParametersMessage
     | ClientScatterParametersMessage
-    | ClearSelectionsMessage
-    | BatonRequestMessage
-    | BatonDonateMessage
 )
 
 
@@ -395,6 +409,7 @@ class ClientScatterParametersMessage(DvDModel):
     BatonRequestMessage,
     SelectionsMessage,
     ClearSelectionsMessage,
+    ClientConfigMessage,
     ClientStatusMessage,
     ClientSelectionMessage,
     ClientLineParametersMessage,
@@ -411,6 +426,8 @@ class ClientScatterParametersMessage(DvDModel):
     SurfaceData,
     TableData,
     PlotConfig,
+    EpicsPVAccessConfig,
+    ProfileToolConfig,
 ) + ALL_MESSAGES
 
 if __name__ == "__main__":
diff --git a/server/davidia/server/plotserver.py b/server/davidia/server/plotserver.py
index d7426af..2594b62 100644
--- a/server/davidia/server/plotserver.py
+++ b/server/davidia/server/plotserver.py
@@ -19,6 +19,7 @@
     _PlotDataMessage,
     ClearPlotMessage,
     ClearSelectionsMessage,
+    ClientConfigMessage,
     ClientSelectionMessage,
     ClientStatusMessage,
     ClientLineParametersMessage,
@@ -242,7 +243,7 @@ async def send_baton_approval_request(self, message: BatonRequestMessage) -> Non
         """Sends message to current baton holder to request baton
         Parameters
         ----------
-        message : ClientMessage
+        message : BatonRequestMessage
         """
         requester = message.requester
         if self.baton is None:
@@ -262,7 +263,7 @@ async def take_baton(self, message: BatonDonateMessage) -> bool:
         """Updates baton and sends new baton messages
         Parameters
         ----------
-        message : ClientMessage
+        message : BatonDonateMessage
 
         Returns
         -------
@@ -801,6 +802,9 @@ async def handle_client(server: PlotServer, plot_id: str, socket: WebSocket, uui
                 continue
 
             match received_message:
+                case ClientConfigMessage():
+                    logger.debug("Received config from client for %s: %s", plot_id, received_message)
+                    pass # TODO update plot server state (does client need baton?)
                 case ClientStatusMessage():
                     status = received_message.status
                     if status == StatusType.ready:
@@ -819,7 +823,6 @@ async def handle_client(server: PlotServer, plot_id: str, socket: WebSocket, uui
                             "Websocket closing for %s:%s", client.name, client.uuid
                         )
                         update_all = await server.remove_client(plot_id, client)
-                        break
                 case BatonRequestMessage():
                     await server.send_baton_approval_request(received_message)
                 case BatonDonateMessage():
@@ -837,7 +840,7 @@ async def handle_client(server: PlotServer, plot_id: str, socket: WebSocket, uui
                         client.uuid,
                         received_message,
                     )
-                    is_valid = client.uuid == server.baton
+                    is_valid = received_message is not None and client.uuid == server.baton
                     if is_valid:
                         omit = client  # omit originating client
                     else:
@@ -847,6 +850,7 @@ async def handle_client(server: PlotServer, plot_id: str, socket: WebSocket, uui
                         )
 
                     if is_valid:
+                        assert isinstance(received_message, ClientMessage)
                         await server.prepare_client(
                             plot_id, received_message, omit_client=omit
                         )