diff --git a/lib/firefly.ts b/lib/firefly.ts
index f977a5f..6d10d66 100644
--- a/lib/firefly.ts
+++ b/lib/firefly.ts
@@ -344,6 +344,10 @@ export default class FireFly extends HttpBase {
     return this.getOne<FireFlyTokenPoolResponse>(`/tokens/pools/${nameOrId}`, options);
   }
 
+  async deleteTokenPool(nameOrId: string, options?: FireFlyDeleteOptions) {
+    await this.deleteOne(`/tokens/pools/${nameOrId}`, options);
+  }
+
   mintTokens(transfer: FireFlyTokenMintRequest, options?: FireFlyCreateOptions) {
     return this.createOne<FireFlyTokenTransferResponse>('/tokens/mint', transfer, options);
   }
@@ -608,26 +612,34 @@ export default class FireFly extends HttpBase {
     subscriptions: string | string[] | FireFlySubscriptionBase,
     callback: FireFlyWebSocketCallback,
     socketOptions?: WebSocket.ClientOptions | http.ClientRequestArgs,
-    afterConnect?: FireFlyWebSocketConnectCallback,
+    fireflySocketOptions?: Partial<FireFlyWebSocketOptions> | FireFlyWebSocketConnectCallback,
   ): FireFlyWebSocket {
+    if (typeof fireflySocketOptions === 'function') {
+      // Legacy compatibility (afterConnect callback passed as 4th arg)
+      fireflySocketOptions = <FireFlyWebSocketOptions>{
+        afterConnect: fireflySocketOptions,
+      };
+    }
     const options: FireFlyWebSocketOptions = {
       host: this.options.websocket.host,
       namespace: this.options.namespace,
       username: this.options.username,
       password: this.options.password,
-      subscriptions: [],
-      autoack: false,
       reconnectDelay: this.options.websocket.reconnectDelay,
       heartbeatInterval: this.options.websocket.heartbeatInterval,
-      socketOptions: socketOptions,
-      afterConnect: afterConnect,
+      autoack: false,
+      ...fireflySocketOptions,
+      socketOptions,
+      subscriptions: [],
     };
 
     const handler: FireFlyWebSocketCallback = (socket, event) => {
       this.queue = this.queue.finally(() => callback(socket, event));
-      this.queue.then(() => {
-        socket.ack(event);
-      });
+      if (!options.noack) {
+        this.queue.then(() => {
+          socket.ack(event);
+        });
+      }
     };
 
     if (Array.isArray(subscriptions)) {
diff --git a/lib/interfaces.ts b/lib/interfaces.ts
index 0438aa5..3f89324 100644
--- a/lib/interfaces.ts
+++ b/lib/interfaces.ts
@@ -76,7 +76,8 @@ export interface FireFlyWebSocketOptions {
   username?: string;
   password?: string;
   ephemeral?: FireFlyEphemeralSubscription;
-  autoack: boolean;
+  autoack?: boolean;
+  noack?: boolean;
   reconnectDelay: number;
   heartbeatInterval: number;
   socketOptions?: WebSocket.ClientOptions | http.ClientRequestArgs;
@@ -171,7 +172,8 @@ export interface FireFlyEnrichedEvent extends FireFlyEventResponse {
   operation?: FireFlyOperationResponse;
 }
 
-export interface FireFlyEventDelivery extends FireFlyEnrichedEvent {
+export interface FireFlyEventDelivery extends Omit<FireFlyEnrichedEvent, 'type'> {
+  type: FireFlyEnrichedEvent['type'] | 'protocol_error';
   subscription: {
     id: string;
     name: string;
diff --git a/package-lock.json b/package-lock.json
index bc914ef..cdaa705 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@hyperledger/firefly-sdk",
-  "version": "1.2.12",
+  "version": "1.2.15",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "@hyperledger/firefly-sdk",
-      "version": "1.2.12",
+      "version": "1.2.15",
       "license": "Apache-2.0",
       "dependencies": {
         "axios": "^0.26.1",
diff --git a/package.json b/package.json
index 902afd0..27ef704 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@hyperledger/firefly-sdk",
-  "version": "1.2.14",
+  "version": "1.2.15",
   "description": "Client SDK for Hyperledger FireFly",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",