diff --git a/bug.py b/bug.py
deleted file mode 100644
index c8a1b96..0000000
--- a/bug.py
+++ /dev/null
@@ -1,15 +0,0 @@
-class A:
-    def __init__(self, arg=None):
-        if arg is None:
-            self.arg = {}
-
-    def set(self):
-        self.arg['something'] = 'something'
-
-
-a1 = A()
-a1.set()
-a2 = A()
-
-print(a2.arg)
-# output is {'something': 'something'}
diff --git a/config.py b/config.py
index d3e2706..0d80de3 100644
--- a/config.py
+++ b/config.py
@@ -1,6 +1,7 @@
 import threading
 import json
 import time
+import queue
 
 
 class Jsondata:
@@ -11,7 +12,7 @@ class Jsondata:
         self.raw_jsondata = jsondata
         self.auto_save = auto_save
         self.auto_save_time = auto_save_time
-        self.thread = threading.Thread(target=self.run, args=())
+        self.thread = threading.Thread(target=self.run, args=(), daemon=True)
         self.thread.start()
 
     def try_to_read_jsondata(self, key, or_value, template=0, output=True):
@@ -36,5 +37,6 @@ class Jsondata:
             if self.auto_save:
                 pass
 
-global_config = {}  
+global_config = {}
+msw_queue = queue.Queue()
 jsondata = Jsondata()
\ No newline at end of file
diff --git a/forwarder.py b/forwarder.py
index b45957a..a73d428 100644
--- a/forwarder.py
+++ b/forwarder.py
@@ -51,5 +51,5 @@ def process_reforware(dp):
         return dp.app, dp
 
 
-thread = threading.Thread(target=send_queue_function, args=())
+thread = threading.Thread(target=send_queue_function, args=(), daemon=True)
 thread.start()
diff --git a/logger.log b/logger.log
index d7e22a5..c62018d 100644
--- a/logger.log
+++ b/logger.log
@@ -3,3 +3,9 @@ plugins.input: asdfasf
 plugins.input: alskdfaj
 plugins.input: alsdkfj
 plugins.input: testtest
+plugins.input: hello
+plugins.input: asldjfalsdjf
+plugins.input: lajsdflajsdlkf
+plugins.input: alsdjflasjdlkfjasldfjalsdfj
+network: 
+network: 
diff --git a/main.py b/main.py
new file mode 100644
index 0000000..6393e55
--- /dev/null
+++ b/main.py
@@ -0,0 +1,10 @@
+import os
+import os.path
+import sys
+
+python = sys.executable
+
+while True:
+    code = os.system('python msw.py')
+    if code:
+        break
\ No newline at end of file
diff --git a/msw.py b/msw.py
index 6964ea2..d94ca7c 100644
--- a/msw.py
+++ b/msw.py
@@ -4,9 +4,9 @@ PATH = os.path.dirname(os.path.abspath(__file__))
 sys.path.append(PATH)
 os.chdir(PATH)
 
-from mswp import Datapack
 import threading
-from config import jsondata, global_config
+from mswp import Datapack
+from config import jsondata, global_config, msw_queue
 
 
 print('Building plugins import script...')
@@ -36,3 +36,6 @@ import plugins
 print('Plugins import finished')
 
 
+# restart
+code = msw_queue.get()
+sys.exit(code)
diff --git a/mswp.py b/mswp.py
index 6bdf27f..a74dbce 100644
--- a/mswp.py
+++ b/mswp.py
@@ -1,6 +1,9 @@
 import os
+import random
+import hashlib
 from config import jsondata
 
+
 '''
 A datapack must like:
 ---------------------
@@ -22,7 +25,7 @@ BUFFSIZE = jsondata.try_to_read_jsondata('buffsize', 4096)
 
 class Datapack:
     def __init__(self, method='post', app='all', version='msw/0.1', head=None, body=b'', 
-    check_head=True, file=None):
+    check_head=True, file=None, gen_flag=True):
         self.id = jsondata.try_to_read_jsondata('id', 'unknown_id')
         if head is None:
             head = {}
@@ -41,6 +44,11 @@ class Datapack:
             self.head = head
         self.body = body
         self.encode_data = b''
+        if gen_flag:
+            randseed = str(random.random()).encode()
+            h = hashlib.blake2b(digest_size = 4)
+            h.update(randseed)
+            self.head['flag'] = h.hexdigest()
 
     def encode(self):
         if self.method == 'file':
diff --git a/plugins/input.py b/plugins/input.py
index 2dbc03b..a379784 100644
--- a/plugins/input.py
+++ b/plugins/input.py
@@ -3,16 +3,32 @@ import copy
 import os
 from mswp import Datapack
 from forwarder import receive_queues, send_queue
+from config import msw_queue
 receive_queue = receive_queues[__name__]
 
 
 def main():
+    while True:
+        try:
+            _main()
+        except Exception as e:
+            print('Error in %s, %s: %s' % (__name__, type(e), str(e)))
+
+
+def _main():
     file_flag = False
     while True:
         file_flag = False
         net_flag = False
         raw_data = input()
 
+        if raw_data == 'restart':
+            msw_queue.put(0)
+            break
+        if raw_data == 'exit':
+            msw_queue.put(1)
+            break
+
         if raw_data[:6] == '(file)': # like "(file)log: filename.exe"
             raw_data = raw_data[6:]
             file_flag = True
@@ -61,5 +77,5 @@ def find_the_last(indata):  # find the last ":" index
     return first_index, last_index
 
 
-thread = threading.Thread(target=main, args=())
+thread = threading.Thread(target=main, args=(), daemon=True)
 thread.start()
diff --git a/plugins/log.py b/plugins/log.py
index ba3ed10..b0bdbe7 100644
--- a/plugins/log.py
+++ b/plugins/log.py
@@ -14,6 +14,6 @@ def main():
                 from_app_name = 'Unknown'
             f.write(from_app_name + ': ' + dp.body.decode() + '\n')
 
-thread = threading.Thread(target=main, args=())
+thread = threading.Thread(target=main, args=(), daemon=True)
 thread.start()
 
diff --git a/plugins/net.py b/plugins/net.py
index c4d56f9..b045694 100644
--- a/plugins/net.py
+++ b/plugins/net.py
@@ -26,13 +26,13 @@ class Network_controller: # manage id and connection
         self.all_connection_list = []
         self.wheel_queue = queue.Queue()
 
-        self.start_wheel_thread = threading.Thread(target=self.start_wheel, args=())
+        self.start_wheel_thread = threading.Thread(target=self.start_wheel, args=(), daemon=True)
         self.start_wheel_thread.start()
 
-        self.start_accpet_connection_thread = threading.Thread(target=self.start_accpet_connection, args=())
+        self.start_accpet_connection_thread = threading.Thread(target=self.start_accpet_connection, args=(), daemon=True)
         self.start_accpet_connection_thread.start()
 
-        self.start_sending_dp_thread = threading.Thread(target=self.start_sending_dp, args=())
+        self.start_sending_dp_thread = threading.Thread(target=self.start_sending_dp, args=(), daemon=True)
         self.start_sending_dp_thread.start()
     
 
@@ -127,21 +127,21 @@ class Connection:
         self.buff = b''
         self.padding_queue = queue.Queue()
 
-        self.thread_recv = threading.Thread(target=self._init, args=())
+        self.thread_recv = threading.Thread(target=self._init, args=(), daemon=True)
         self.thread_recv.start()
 
         self.thread_send = None
 
 
     def _init(self): # init to check connection id, threading
-        err_code = self.check_id()
+        err_code, flag = self.check_id()
         if err_code:
-            print('Init connection failed, connection closed')
+            print('<%s> Init connection failed, connection closed, code: %s' % (flag, err_code))
             self.conn.close()
 
         self.netowrk_controller.set_connection(self.id, self)
         
-        self.thread_send = threading.Thread(target=self.send_func, args=())
+        self.thread_send = threading.Thread(target=self.send_func, args=(), daemon=True)
         self.thread_send.start()
 
         self.receive()
@@ -213,19 +213,29 @@ class Connection:
         length: 0
         
         -------------------------------
+        error code list:
+        1: not get "id" in head
+        2: receive data failed
+        3: appname is not handshake
         '''
         data = self.conn.recv(BUFFSIZE)
         if not data:
-            return 2
+            return 2, ''
 
         self.buff += data
         dp = Datapack()
         dp.encode_data = self.buff # maybe here needs to use copy.copy(self.buff)
         self.buff = dp.decode(only_head=True)
         if not dp.head.get('id'):
-            return 1
+            return 1, dp.head.get('flag')
+
+        if not dp.app == 'handshake':
+            return 3, dp.head.get('flag')
+
         self.id = dp.head['id']
 
+        return 0, dp.head.get('flag')
+
 
     def sendall(self, dp):
         self.padding_queue.put(dp)
@@ -246,5 +256,5 @@ class Connection:
                 self.conn.sendall(dp.encode_data)
 
 
-thread = threading.Thread(target=main, args=())
+thread = threading.Thread(target=main, args=(), daemon=True)
 thread.start()
diff --git a/plugins/update.py b/plugins/update.py
index d4f542d..d57dbec 100644
--- a/plugins/update.py
+++ b/plugins/update.py
@@ -70,5 +70,5 @@ class Compresser:
         return filelist
 
 
-thread = threading.Thread(target=main, args=())
+thread = threading.Thread(target=main, args=(), daemon=True)
 thread.start()
diff --git a/test_tool.py b/test_tool.py
index 742464c..f4c3c13 100644
--- a/test_tool.py
+++ b/test_tool.py
@@ -6,6 +6,7 @@ s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
 id = b'''post handshake msw/1.0
 id: miku2
 length: 0
+flag: ee20aeff
 
 '''