inet4: added default template param N=0 for stack getters

Author: alfreb

api/net/inet4.hpp

@@ -157,15 +157,15 @@ namespace net {
     }
 
     /** Return the stack on the given Nic */
-    template <int N>
+    template <int N = 0>
     static auto&& stack()
     {
       static Inet4 inet{hw::Devices::nic(N)};
       return inet;
     }
 
     /** Static IP config */
-    template <int N>
+    template <int N = 0>
     static auto&& ifconfig(
       IP4::addr addr,
       IP4::addr nmask,
@@ -177,7 +177,7 @@ namespace net {
     }
 
     /** DHCP config */
-    template <int N>
+    template <int N = 0>
     static auto& ifconfig(double timeout = 10.0, dhcp_timeout_func on_timeout = nullptr)
     {
       stack<N>().negotiate_dhcp(timeout, on_timeout);

examples/demo_service/service.cpp

@@ -70,11 +70,11 @@ void Service::start(const std::string&)
   // DHCP on interface 0
   auto& inet = net::Inet4::ifconfig<0>(10.0);
   // static IP in case DHCP fails
-  net::Inet4::ifconfig<0>(
+  net::Inet4::ifconfig(
     { 10,0,0,42 },     // IP
     { 255,255,255,0 }, // Netmask
     { 10,0,0,1 },      // Gateway
-    { 10,0,0,1 });     // DNS  
+    { 10,0,0,1 });     // DNS
 
   // Print some useful netstats every 30 secs
   Timers::periodic(5s, 30s,