feat(server): add bool operator

Fixes #73.

Signed-off-by: Frederic Pillon <[email protected]>

Author: fpistm

src/EthernetServer.cpp

@@ -107,3 +107,9 @@ size_t EthernetServer::write(const uint8_t *buffer, size_t size)
 
   return n;
 }
+
+EthernetServer::operator bool()
+{
+  // server is listening for incoming clients
+  return ((_tcp_server.pcb != NULL) && (_tcp_server.pcb->state == LISTEN));
+}

src/EthernetServer.h

@@ -20,6 +20,7 @@ class EthernetServer :
     virtual void begin(uint16_t port);
     virtual size_t write(uint8_t);
     virtual size_t write(const uint8_t *buf, size_t size);
+    virtual operator bool();
     using Print::write;
 };