From bf2fcc1602001f7ef4c4cc26b558df6a8961c4bc Mon Sep 17 00:00:00 2001
From: Christian Ulrich <christian@ulrich.earth>
Date: Fri, 25 Sep 2020 20:58:04 +0200
Subject: [PATCH] use random source port to work around 'address in use' error

---
 examples/app/app.nim | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/examples/app/app.nim b/examples/app/app.nim
index aeca967..1c54fd3 100644
--- a/examples/app/app.nim
+++ b/examples/app/app.nim
@@ -6,8 +6,6 @@ import asyncutils
 import ../../message
 import random
 
-const AcceptPort = Port(2000)
-
 type
   PunchdResponse = Future[tuple[msgContent: string, sock: AsyncSocket]]
   PunchdProgressCb = proc (future: PunchdResponse, msgContent: string) {.async.}
@@ -214,11 +212,13 @@ proc runApp(serverHostname: string, serverPort: Port, peerId: string,
   asyncCheck handlePunchdMessages(punchdConn)
   if otherPeerId.len == 0:
     # register and wait for connections
+    let acceptPort = rand(Port(1024) .. Port.high)
+    echo &"init server connection, probing port: {acceptPort}"
     let serverConn = await initServerConnection(serverHostname, serverPort,
-                                                AcceptPort)
+                                                acceptPort)
     asyncCheck handleServerMessages(serverConn)
     asyncCheck handlePeerNotifications(serverConn, punchdConn, peerId)
-    let myPorts = (@[AcceptPort] & serverConn.probedPorts).join(",")
+    let myPorts = (@[acceptPort] & serverConn.probedPorts).join(",")
     let req = &"{peerId}|{serverConn.probedIp}|{myPorts}"
     echo "registering: ", req
     discard await serverConn.sendRequest("register", req)