diff --git a/lib/tunnelbroker/secondary-tunnelbroker-connection.js b/lib/tunnelbroker/secondary-tunnelbroker-connection.js
--- a/lib/tunnelbroker/secondary-tunnelbroker-connection.js
+++ b/lib/tunnelbroker/secondary-tunnelbroker-connection.js
@@ -1,14 +1,19 @@
 // @flow
 
 import type { MessageToDeviceRequest } from '../types/tunnelbroker/message-to-device-request-types.js';
+import type { MessageToTunnelbrokerRequest } from '../types/tunnelbroker/message-to-tunnelbroker-request-types.js';
 
 type RemoveCallback = () => void;
 
 export type SecondaryTunnelbrokerConnection = {
   // Used by an inactive tab to send messages
-  +sendMessage: MessageToDeviceRequest => mixed,
+  +sendMessage: (
+    MessageToDeviceRequest | MessageToTunnelbrokerRequest,
+  ) => mixed,
   // Active tab receives messages from inactive tabs
-  +onSendMessage: ((MessageToDeviceRequest) => mixed) => RemoveCallback,
+  +onSendMessage: (
+    (MessageToDeviceRequest | MessageToTunnelbrokerRequest) => mixed,
+  ) => RemoveCallback,
 
   // Active tab sets the message status of messages from inactive tabs
   +setMessageStatus: (messageID: string, error: ?string) => mixed,
diff --git a/lib/tunnelbroker/tunnelbroker-context.js b/lib/tunnelbroker/tunnelbroker-context.js
--- a/lib/tunnelbroker/tunnelbroker-context.js
+++ b/lib/tunnelbroker/tunnelbroker-context.js
@@ -14,6 +14,7 @@
 import { isWebPlatform } from '../types/device-types.js';
 import type { MessageSentStatus } from '../types/tunnelbroker/message-to-device-request-status-types.js';
 import type { MessageToDeviceRequest } from '../types/tunnelbroker/message-to-device-request-types.js';
+import type { MessageToTunnelbrokerRequest } from '../types/tunnelbroker/message-to-tunnelbroker-request-types.js';
 import {
   type TunnelbrokerMessage,
   tunnelbrokerMessageTypes,
@@ -59,6 +60,7 @@
     message: TunnelbrokerClientMessageToDevice,
     messageID: ?string,
   ) => Promise<void>,
+  +sendMessageToTunnelbroker: (payload: string) => Promise<void>,
   +addListener: (listener: TunnelbrokerSocketListener) => void,
   +removeListener: (listener: TunnelbrokerSocketListener) => void,
   +socketState: TunnelbrokerSocketState,
@@ -309,7 +311,7 @@
   ]);
 
   const sendMessageToDeviceRequest: (
-    request: MessageToDeviceRequest,
+    request: MessageToDeviceRequest | MessageToTunnelbrokerRequest,
   ) => Promise<void> = React.useCallback(
     request => {
       return new Promise((resolve, reject) => {
@@ -349,6 +351,20 @@
     [sendMessageToDeviceRequest],
   );
 
+  const sendMessageToTunnelbroker: (payload: string) => Promise<void> =
+    React.useCallback(
+      (payload: string) => {
+        const clientMessageID = uuid.v4();
+        const messageToTunnelbroker: MessageToTunnelbrokerRequest = {
+          type: tunnelbrokerMessageTypes.MESSAGE_TO_TUNNELBROKER_REQUEST,
+          clientMessageID,
+          payload,
+        };
+        return sendMessageToDeviceRequest(messageToTunnelbroker);
+      },
+      [sendMessageToDeviceRequest],
+    );
+
   React.useEffect(
     () =>
       secondaryTunnelbrokerConnection?.onSendMessage(message => {
@@ -419,12 +435,19 @@
   const value: TunnelbrokerContextType = React.useMemo(
     () => ({
       sendMessage,
+      sendMessageToTunnelbroker,
       socketState,
       addListener,
       removeListener,
       setUnauthorizedDeviceID,
     }),
-    [sendMessage, socketState, addListener, removeListener],
+    [
+      sendMessage,
+      sendMessageToTunnelbroker,
+      socketState,
+      addListener,
+      removeListener,
+    ],
   );
 
   return (