diff --git a/parser.py b/parser.py
index 863f19a..301b8e9 100644
--- a/parser.py
+++ b/parser.py
@@ -3,7 +3,7 @@
 import pyshark
 
 def parse_pcap(filename):
-  pkts = pyshark.FileCapture(input_file=filename, use_json=True, include_raw=True)#._packets_from_tshark_sync()
+  pkts = pyshark.FileCapture(input_file=filename, use_json=True, include_raw=True)
   return pkts
 
 
diff --git a/requirements.txt b/requirements.txt
index bc0dcd5..7423140 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1,2 @@
 pyshark
+nest_asyncio
diff --git a/target.py b/target.py
index 2e56eee..abea669 100755
--- a/target.py
+++ b/target.py
@@ -1,35 +1,48 @@
 #!/usr/bin/python3
-
+  
 import socket
 import pyshark
+import nest_asyncio
 
 import config
 import parser
 
 if __name__ == "__main__":
+  # pyshark async problem resolve
+  nest_asyncio.apply()
+
   with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as conn:
     conn.connect((config.HOST_IP, config.FUZZ_PORT))
-    
+
     # recv pcap data
-    pcap_data = b""
     while True:
-      data = conn.recv(1024)
-      if not data or len(data) != 1024:
-        break
-      else:
+      pcap_data = b""
+      while True:
+        data = conn.recv(1024)
+        if not data:
+          break
+
         pcap_data += data
-    
+
+        if len(data) != 1024:
+          break
+      
+      if config.DEBUG:
+        print("pcap len :", len(pcap_data))
+
       # save file and parse it
       with open("rcv.pcap", "wb") as f:
         f.write(pcap_data)
       pkts = parser.parse_pcap("rcv.pcap")
-  
+
+      if config.DEBUG:
+        pkts.set_debug()
+
       raw_sock = socket.socket(socket.AF_PACKET, socket.SOCK_RAW)
       raw_sock.bind((config.INTERFACE_NAME, 0))
-  
+
       for pkt in pkts:
         raw_sock.send(bytearray.fromhex(pkt.frame_raw.value))
       pkts.close()
-      
-      conn.sendall("NXT")
 
+      conn.sendall(b"NXT")