server: Initialize class member on dynamic alloc

Also replace default constructor to use port 80 by default.

I noticed that server worked on global instance.
but not if used in class (allocated with new).

This change makes both use cases working.

Forwarded: #17
Relate-to: https://github.com/rzr/webthing-iotjs/wiki/MCU
Change-Id: I2e21e34a43f3cadb7981f2e359a5960735daa5d3
Signed-off-by: Philippe Coval <[email protected]>

Author: rzr

src/EthernetServer.cpp

@@ -9,6 +9,8 @@ extern "C" {
 EthernetServer::EthernetServer(uint16_t port)
 {
   _port = port;
+  _tcp_client[MAX_CLIENT] = {};
+  _tcp_server = {};
 }
 
 void EthernetServer::begin()

src/EthernetServer.h

@@ -14,7 +14,7 @@ public Server {
 
   void accept(void);
 public:
-  EthernetServer(uint16_t);
+  EthernetServer(uint16_t port = 80);
   EthernetClient available();
   virtual void begin();
   virtual size_t write(uint8_t);