introduce AcceptPort constant; add debug output

examples/app/app.nim

@@ -5,6 +5,8 @@ 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.}
@@ -186,6 +188,7 @@ proc initServerConnection(serverHostname: string, serverPort: Port,
     assert(args[0] == "ok")
     assert(args[1] == $id)
     let endpoint = parseMessage[OkGetEndpoint](args[2])
+    echo "endpoint: ", endpoint
     result.probedIp = endpoint.ip
     result.probedPorts.add(endpoint.port)
     let emptyLine = await sock.recvLine(maxLength = 400)
@@ -208,10 +211,10 @@ proc runApp(serverHostname: string, serverPort: Port, peerId: string,
   if otherPeerId.len == 0:
     # register and wait for connections
     let serverConn = await initServerConnection(serverHostname, serverPort,
-                                                Port(4321))
+                                                AcceptPort)
     asyncCheck handleServerMessages(serverConn)
     asyncCheck handlePeerNotifications(serverConn, punchdConn, peerId)
-    let myPorts = (@[Port(4321)] & serverConn.probedPorts).join(",")
+    let myPorts = (@[AcceptPort] & serverConn.probedPorts).join(",")
     let req = &"{peerId}|{serverConn.probedIp}|{myPorts}"
     echo "registering: ", req
     discard await serverConn.sendRequest("register", req)