diff --git a/quicp2p.nim b/quicp2p.nim
index 3b9ecc9..2304953 100644
--- a/quicp2p.nim
+++ b/quicp2p.nim
@@ -20,8 +20,10 @@ from openssl import DLLSSLName, EVP_PKEY
 from posix import IOVec
 from strutils import parseUInt
 
-const certChainPath = "./certs/server-certchain.pem"
-const keyPath = "./certs/server-cert.key"
+const serverCertChainPath = "./certs/server-certchain.pem"
+const serverKeyPath = "./certs/server-cert.key"
+const clientCertChainPath = "./certs/server-certchain.pem"
+const clientKeyPath = "./certs/server-cert.key"
 
 type
   QuicP2PContext = ref object
@@ -66,6 +68,7 @@ proc onReceiveReset(stream: ptr quicly_stream_t, err: cint) {.cdecl.} =
 
 proc onServerReceive(stream: ptr quicly_stream_t, offset: csize_t, src: pointer,
                      len: csize_t) {.cdecl.} =
+  echo "onServerReceive"
   if quicly_streambuf_ingress_receive(stream, offset, src, len) != 0:
     return
   let input = quicly_streambuf_ingress_get(stream)
@@ -77,6 +80,7 @@ proc onServerReceive(stream: ptr quicly_stream_t, offset: csize_t, src: pointer,
 
 proc onClientReceive(stream: ptr quicly_stream_t, offset: csize_t,
                       src: pointer, len: csize_t) {.cdecl.} =
+  echo "onClientReceive"
   if quicly_streambuf_ingress_receive(stream, offset, src, len) != 0:
     return
   let input = quicly_streambuf_ingress_get(stream)
@@ -109,13 +113,17 @@ proc usage() =
 
 proc onServerStreamOpen(self: ptr quicly_stream_open_t,
                         stream: ptr quicly_stream_t): cint {.cdecl.} =
+  echo "onServerStreamOpen"
   result = quicly_streambuf_create(stream, sizeof(quicly_streambuf_t).csize_t)
   stream.callbacks = addr streamCallbacksServer
 
 proc onClientStreamOpen(self: ptr quicly_stream_open_t,
                         stream: ptr quicly_stream_t): cint {.cdecl.} =
+  echo "onClientStreamOpen"
   result = quicly_streambuf_create(stream, sizeof(quicly_streambuf_t).csize_t)
   stream.callbacks = addr streamCallbacksClient
+  let msg = "hello server"
+  discard quicly_streambuf_egress_write(stream, msg.cstring, msg.len().csize_t)
 
 proc handleMsg(ctx: QuicP2PContext, msg: string, isServer: bool) =
   var offset: csize_t = 0
@@ -136,13 +144,15 @@ proc handleMsg(ctx: QuicP2PContext, msg: string, isServer: bool) =
         conn = c
         break
     if conn != nil:
+      echo "quicly_receive"
       discard quicly_receive(conn, nil, addr sockAddr, addr decoded)
     elif isServer:
+      echo "quicly_accept"
       discard quicly_accept(addr conn, addr ctx.quiclyCtx, nil, addr sockAddr,
                             addr decoded, nil, addr ctx.nextCid, nil)
       ctx.connections.add(conn)
 
-proc initContext(sock: AsyncSocket,
+proc initContext(sock: AsyncSocket, certChainPath: string, keyPath: string,
                  streamOpenCb: typeof(quicly_stream_open_t.cb)):
                  QuicP2PContext =
   var tlsCtx = ptls_context_t(randomBytes: ptlsOpensslRandomBytes,
@@ -177,33 +187,40 @@ proc sendPackets(ctx: QuicP2PContext) =
                                  dgramsBuf.len().csize_t)
     case sendResult:
     of 0:
-      for d in dgrams:
-        var sockLen = quicly_get_socklen(addr dstAddr.sa)
-        asyncCheck sendTo(ctx.sock.getFd().AsyncFD, d.iov_base, d.iov_len.int,
-                          addr dstAddr.sa, sockLen)
+      if dgramCount > 0:
+        echo &"sending {dgramCount} datagrams"
+        for i in 0 .. dgramCount - 1:
+          #echo "dstAddr.sa: ", dstAddr.sa
+          var sockLen = quicly_get_socklen(addr dstAddr.sa)
+          asyncCheck sendTo(ctx.sock.getFd().AsyncFD, dgrams[i].iov_base,
+                            dgrams[i].iov_len.int, addr dstAddr.sa, sockLen)
     of QUICLY_ERROR_FREE_CONNECTION:
       ctx.connections.del(ctx.connections.find(c))
       quicly_free(c)
     else:
       raise newException(ValueError, &"quicly_send returned {sendResult}")
 
-proc receive(ctx: QuicP2PContext, sock: AsyncSocket, isServer: bool) {.async.} =
+proc receive(ctx: QuicP2PContext, isServer: bool) {.async.} =
   while true:
-    let msg = await sock.recv(BufferSize)
-    handleMsg(ctx, msg, isServer)
+    let msg = await ctx.sock.recv(BufferSize)
+    echo &"received {msg.len()} bytes"
+    if msg.len > 0:
+      handleMsg(ctx, msg, isServer)
 
 proc main() =
   var ctx: QuicP2PContext
-  let sock = newAsyncSocket(sockType = SOCK_DGRAM, protocol = IPPROTO_UDP)
+  let sock = newAsyncSocket(sockType = SOCK_DGRAM, protocol = IPPROTO_UDP,
+                            buffered = false)
   case paramCount():
   of 1:
     let portNumber = paramStr(1).parseUInt()
     if portNumber > uint16.high:
       usage()
       quit(1)
-    ctx = initContext(sock, onServerStreamOpen)
     sock.bindAddr(Port(portNumber))
-    asyncCheck receive(ctx, sock, true)
+    ctx = initContext(sock, serverCertChainPath, serverKeyPath,
+                      onServerStreamOpen)
+    asyncCheck receive(ctx, true)
 
   of 2:
     let hostname = paramStr(1)
@@ -211,7 +228,8 @@ proc main() =
     if portNumber > uint16.high:
       usage()
       quit(1)
-    ctx = initContext(sock, onClientStreamOpen)
+    ctx = initContext(sock, clientCertChainPath, clientKeyPath,
+                      onClientStreamOpen)
     var conn: ptr quicly_conn_t
     let hostent = getHostByName(hostname)
     if hostent.addrList.len == 0:
@@ -231,7 +249,7 @@ proc main() =
     ctx.connections.add(conn)
     var stream: ptr quicly_stream_t
     discard quicly_open_stream(conn, addr stream, 0)
-    asyncCheck receive(ctx, sock, false)
+    asyncCheck receive(ctx, false)
 
   else:
     usage()
@@ -239,7 +257,6 @@ proc main() =
 
   while true:
     let nextTimeout = ctx.getRelativeTimeout()
-    echo "nextTimeout: ", nextTimeout
     poll(nextTimeout)
     ctx.sendPackets()