diff --git a/src/debug/WARDuino.ts b/src/debug/WARDuino.ts
index ac859a8..f5fe5ea 100644
--- a/src/debug/WARDuino.ts
+++ b/src/debug/WARDuino.ts
@@ -11,6 +11,20 @@ export namespace WARDuino {
         tableIndexes: number[]
     }
 
+    export enum Inspect {
+        counter = '01',
+        breakpoints = '02',
+        callstack = '03',
+        globals = '04',
+        table = '05',
+        memory = '06',
+        branching = '07',
+        stack = '08',
+        callbacks = '09',
+        events = '0a',
+        io = '0b'
+    }
+
     export enum Interrupt {
         run = '01',
         halt = '02',
@@ -71,5 +85,6 @@ export namespace WARDuino {
         br_table?: BRTable;
         callbacks?: CallbackMapping[];
         events?: InterruptEvent[];
+        io?: string[];
     }
 }
\ No newline at end of file
diff --git a/src/messaging/Message.ts b/src/messaging/Message.ts
index 649e362..376aae6 100644
--- a/src/messaging/Message.ts
+++ b/src/messaging/Message.ts
@@ -28,6 +28,7 @@ export interface Request<R> {
 }
 
 export namespace Message {
+    import Inspect = WARDuino.Inspect;
     export const run: Request<Ack> = {
         type: Interrupt.run,
         parser: (line: string) => {
@@ -83,10 +84,11 @@ export namespace Message {
         };
     }
 
-    export function inspect(payload: string): Request<State> {
+    export function inspect(fields: Inspect[]): Request<State> {
         return {
             type: Interrupt.inspect,
-            payload: () => payload,
+            payload: () => fields.length.toString(16).padStart(4, '0') + fields.join('')
+            ,
             parser: stateParser
         }
     }
@@ -211,7 +213,7 @@ export namespace Message {
         parser: stateParser
     }
 
-    export const proxifyRequest: Request<string> =  {
+    export const proxifyRequest: Request<string> = {
         type: Interrupt.proxify,
         parser: identityParser
     };