diff --git a/server.py b/server.py
index 35a1bee..6c67619 100644
--- a/server.py
+++ b/server.py
@@ -2,15 +2,39 @@
 #coding:utf-8
 import socketserver
 import subprocess
+import pickle
+
+
+
 offs = 0    #偏移量
 p ={}
 #保存终端信息，ccid与地址对
 #p={ccid=addr,}
 #缓存未能正常发送消息的客户端
 pp={}
-cache=[]
+# cache={}
+from collections import defaultdict 
+cache=defaultdict(list)
 
 
+def save_cache(dic):
+    '''缓存未发送成功的消息'''
+
+    # f=open("./cache.txt",mode='w+')
+    # f.write(str(dic))
+    # f.close
+    pickle.dump(dic,open("./cache.txt",'wb'))
+
+def load_cache():
+    try:
+        # f=open("./cache.txt")
+        # c = eval(f.read())
+        # f.close()
+        c=pickle.load(open("./cache.txt",'rb'))
+        return c
+    except:
+        return None
+
 def update_pairs(addr,ccid,clear=0):
     '''更新终端库
     addr:绑定tcp地址
@@ -59,13 +83,25 @@ def get_ccid(addr):
 +--------+--------------+----------+----------+--------------+------------------------+--------+
 '''
 
+def send(fd,data):
+    try:
+        fd.send(data)
+        return 0
+    except:
+        return -1
+
 def tt_hh(addr,data):
     '''处理心跳'''
 
     # 更新pairs
-    update_pairs(addr,data[7+offs:11+offs])
+    ccid = data[7+offs:11+offs]
+    update_pairs(addr,ccid)
     # 组帧再返回
 
+    # 从缓存中匹配数据并重发
+    if ccid in cache:
+        for i in cache[ccid]:
+            addr.send(i)
 
     return 0
 
@@ -74,27 +110,37 @@ def tt_trans(addr,data):
 
     tccid = data[7+offs:11+offs]
     taddr = get_addr(tccid)
-    if not taddr:
-        print("未找到在线终端，可能终端未在线或ccid错。")
-        return 0
-    print("找到匹配终端：",tccid,"<--->",taddr)
     # 组帧
     msg = bytearray(data[:])
-    msg[:5]=b'$TMMX'
+    msg[:5]=b'$TTMX'
     msg[7+offs:11+offs] = get_ccid(addr)
 
     # 计算校验和
     crc = 0
-    for i in msg[:-2]:
+    for i in msg[:-1]:
         crc = crc ^ i
     msg[-1]=crc
 
+    if not taddr:
+        #更新缓存
+        #{tccid1=[msg1,msg2,...],...}
+        cache[tccid].append(msg)
+        save_cache(cache)
+        print("未找到在线终端，可能终端未在线或ccid错。")
+        return 0
+    print("找到匹配终端：",tccid,"<--->",taddr)
+    
+
     # 发送
     try:
         taddr.send(msg)
     except Exception:
-        # 更新pairs
+        # 更新pairs，清空对应终端
         update_pairs(taddr,tccid,1)
+        #更新缓存
+        #{tccid1=[msg1,msg2,...],...}
+        cache[tccid].append(msg)
+        save_cache(cache)
         print("终端已掉线。",taddr)
     return 0
 
@@ -114,7 +160,7 @@ def tt_decode(addr,data):
     '''处理收到的数据'''
 
     
-    if  data[:5].hex() != "2454544d53" or len(data) <12:
+    if  data[:5] != b'$TTMS' or len(data) <12:
         # 数据长度不可能小于12，考虑非法接入的可能，主动断开连接
         return -1
     
@@ -151,8 +197,13 @@ class MyServer(socketserver.BaseRequestHandler):
 
 
 if __name__ == '__main__':
+    # load_cache
+    cache = load_cache()
+
     server = socketserver.ThreadingTCPServer(('localhost',8005), MyServer)
     ip, port = server.server_address
     print ("服务端已建立：",ip, port)
     server.serve_forever()
 
+    
+