diff --git a/code/wbstream_poc_datachannel.py b/code/wbstream_poc_datachannel.py
index 3428fc7..45cbfef 100755
--- a/code/wbstream_poc_datachannel.py
+++ b/code/wbstream_poc_datachannel.py
@@ -2,8 +2,9 @@
 """PoC: WB Stream DataChannel over LiveKit."""
 
 import asyncio
+import base64
+import json
 import logging
-import uuid
 import requests
 
 try:
@@ -20,6 +21,22 @@ HARDCODED_ROOM_ID = "019e23c2-a580-7550-b08a-7ac5342ca21f"
 TEST_ATTEMPTS = 60
 TEST_MESSAGES = [f"WB Stream DataChannel attempt {idx:02d}" for idx in range(1, TEST_ATTEMPTS + 1)]
 
+
+def _decode_jwt_payload(token: str) -> dict:
+    """Decode JWT payload without verifying the signature; useful for inspecting LiveKit grants."""
+    try:
+        payload = token.split(".")[1]
+        payload += "=" * (-len(payload) % 4)
+        return json.loads(base64.urlsafe_b64decode(payload))
+    except Exception as exc:
+        return {"decode_error": str(exc)}
+
+
+def _print_token_grants(label: str, token: str) -> None:
+    payload = _decode_jwt_payload(token)
+    print(f"     {label} token identity={payload.get('sub')} name={payload.get('name')}")
+    print(f"     {label} video grants={json.dumps(payload.get('video', {}), ensure_ascii=False, sort_keys=True)}")
+
 def _get_room_token(room_id: str, display_name: str) -> tuple[str, str]:
     """Retrieves the room token via the guest API."""
     headers = {
@@ -47,7 +64,15 @@ def _get_room_token(room_id: str, display_name: str) -> tuple[str, str]:
 async def run_poc() -> dict:
     """Runs the complete PoC flow."""
     print("\n--- WB Stream PoC ---")
-    results = {"server_ok": False, "client_ok": False, "sent": 0, "recv": 0, "errors": []}
+    results = {
+        "server_ok": False,
+        "client_ok": False,
+        "sent": 0,
+        "server_recv": 0,
+        "echo_sent": 0,
+        "client_recv": 0,
+        "errors": [],
+    }
     
     server, client = rtc.Room(), rtc.Room()
     shared_room_id = HARDCODED_ROOM_ID
@@ -56,15 +81,30 @@ async def run_poc() -> dict:
     try:
         shared_room_id, server_tok = _get_room_token(shared_room_id, "OlcRTC-Server")
         _, client_tok = _get_room_token(shared_room_id, "OlcRTC-Client")
+        _print_token_grants("server", server_tok)
+        _print_token_grants("client", client_tok)
 
         @server.on("data_received")
         def on_server_data(dp: rtc.DataPacket):
             if dp.topic == "olcrtc":
-                asyncio.create_task(server.local_participant.publish_data(f"Echo: {dp.data.decode()}".encode(), topic="olcrtc"))
+                msg = dp.data.decode(errors="replace")
+                results["server_recv"] += 1
+                print(f" <- Server recv #{results['server_recv']:02d}: {msg}")
+
+                async def echo() -> None:
+                    try:
+                        await server.local_participant.publish_data(f"Echo: {msg}".encode(), topic="olcrtc")
+                        results["echo_sent"] += 1
+                    except Exception as exc:
+                        results["errors"].append(f"Echo failed: {exc}")
+
+                asyncio.create_task(echo())
 
         @client.on("data_received")
         def on_client_data(dp: rtc.DataPacket):
-            results["recv"] += 1
+            if dp.topic == "olcrtc":
+                results["client_recv"] += 1
+                print(f" <- Client recv #{results['client_recv']:02d}: {dp.data.decode(errors='replace')}")
 
         await server.connect(WS_URL, server_tok)
         results["server_ok"] = True
@@ -98,10 +138,14 @@ async def run_poc() -> dict:
 def print_results(res: dict):
     print("\n--- TEST RESULTS ---")
     print(f"Server: {':P' if res['server_ok'] else 'X'} / Client: {':P' if res['client_ok'] else 'X'}")
-    print(f"Messages: Sent {res['sent']} / Recv {res['recv']}")
+    print(
+        "Messages: "
+        f"Client sent {res['sent']} / Server recv {res['server_recv']} / "
+        f"Echo sent {res['echo_sent']} / Client recv {res['client_recv']}"
+    )
     if res['errors']:
         for e in res['errors']: print(f" Error: {e}")
-    print(f"\n{':P SUCCESS' if res['sent'] and res['sent'] == res['recv'] else 'X FAILED'}\n")
+    print(f"\n{':P SUCCESS' if res['sent'] and res['sent'] == res['client_recv'] else 'X FAILED'}\n")
 
 if __name__ == "__main__":
     try: