diff --git a/a8/udplistener.cc b/a8/udplistener.cc
index 9018886..52c3bfe 100644
--- a/a8/udplistener.cc
+++ b/a8/udplistener.cc
@@ -12,6 +12,7 @@
 #include <functional>
 #include <thread>
 
+#include <a8/a8.h>
 #include <a8/udplistener.h>
 
 namespace a8
@@ -19,7 +20,10 @@ namespace a8
 
     long long UdpPacket::GetRemoteKey()
     {
-        return 0;
+        unsigned long addr = remote_addr.sin_addr.s_addr;
+        int port = remote_addr.sin_port;
+        long long key = a8::MakeInt64(addr, port);
+        return key;
     }
 
     struct UdpListenerImpl
@@ -101,8 +105,8 @@ namespace a8
         {
             if(!ActiveStart())
                 return;
-            struct sockaddr_in destAddr;
-            socklen_t addrLen = sizeof(sockaddr_in);
+            struct sockaddr_in from_addr;
+            socklen_t addr_len = sizeof(sockaddr_in);
             char recv_buf[1024 * 64];
             int buflen = sizeof(recv_buf);
             while (!shutdown) {
@@ -110,10 +114,15 @@ namespace a8
                                      recv_buf,
                                      buflen,
                                      0,
-                                     (struct sockaddr*)&destAddr,
-                                     (socklen_t*)&addrLen);
+                                     (struct sockaddr*)&from_addr,
+                                     (socklen_t*)&addr_len);
                 if(ret > 0) {
-                    master->on_recv_packet(nullptr);
+                    a8::UdpPacket* pkt = new a8::UdpPacket();
+                    pkt->buf = (char*)malloc(ret + 1);
+                    memmove((void*)pkt->buf, recv_buf, ret);
+                    pkt->buf_len = ret;
+                    pkt->remote_addr = from_addr;
+                    master->on_recv_packet(pkt);
                 }
             }
         }
@@ -153,6 +162,12 @@ namespace a8
 
     void UdpListener::SendUdpPacket(UdpPacket* pkt)
     {
+        //a8::XPrintf("SendUdpPacket buflen:%d\n", {pkt->buf_len});
+        ::sendto(impl_->listen_socket,
+                 pkt->buf,
+                 pkt->buf_len,
+                 0,
+                 (struct sockaddr*)&pkt->remote_addr, sizeof(pkt->remote_addr));
 
     }
 
diff --git a/a8/udplistener.h b/a8/udplistener.h
index c257ec7..efc2516 100644
--- a/a8/udplistener.h
+++ b/a8/udplistener.h
@@ -9,7 +9,7 @@ namespace a8
 {
     struct UdpPacket
     {
-        char* buf = nullptr;
+        const char* buf = nullptr;
         int buf_len = 0;
         sockaddr_in remote_addr;