work-in-progress

add UDP network connection for physics client <-> server.
also set spinning friction in rolling friction demo (otherwise objects may keep on spinning forever)

test/enet/chat/server/main.cpp

@@ -0,0 +1,103 @@
+/* server.cpp */
+#include <stdio.h>
+#include <enet/enet.h>
+
+int main(int argc, char *argv[])
+{
+	ENetAddress address;
+	ENetHost *server;
+	ENetEvent event;
+	int serviceResult;
+
+	puts("Starting server");
+
+	if (enet_initialize() != 0)
+	{
+		puts("Error initialising enet");
+		exit(EXIT_FAILURE);
+	}
+
+
+	/* Bind the server to the default localhost.     */
+	/* A specific host address can be specified by   */
+	/* enet_address_set_host (& address, "x.x.x.x"); */
+	address.host = ENET_HOST_ANY;
+	/* Bind the server to port 1234. */
+	address.port = 1234;
+
+	server = enet_host_create(&address,
+		32,   /* number of clients */
+		2,    /* number of channels */
+		0,    /* Any incoming bandwith */
+		0);   /* Any outgoing bandwith */
+
+	if (server == NULL)
+	{
+		puts("Could not create server host");
+		exit(EXIT_FAILURE);
+	}
+
+
+	while (true)
+	{
+		serviceResult = 1;
+
+		/* Keep doing host_service until no events are left */
+		while (serviceResult > 0)
+		{
+			/* Wait up to 1000 milliseconds for an event. */
+			serviceResult = enet_host_service(server, &event, 1000);
+
+			if (serviceResult > 0)
+			{
+
+				switch (event.type)
+				{
+				case ENET_EVENT_TYPE_CONNECT:
+					printf("A new client connected from %x:%u.\n",
+						event.peer->address.host,
+						event.peer->address.port);
+
+					/* Store any relevant client information here. */
+					event.peer->data = (void*)"Client information";
+
+					break;
+
+				case ENET_EVENT_TYPE_RECEIVE:
+					printf("A packet of length %u containing '%s' was "
+						"received from %s on channel %u.\n",
+						event.packet->dataLength,
+						event.packet->data,
+						event.peer->data,
+						event.channelID);
+
+					/* Tell all clients about this message */
+					enet_host_broadcast(server, 0, event.packet);
+
+					break;
+
+				case ENET_EVENT_TYPE_DISCONNECT:
+					printf("%s disconected.\n", event.peer->data);
+
+					/* Reset the peer's client information. */
+
+					event.peer->data = NULL;
+
+					break;
+				}
+			}
+			else if (serviceResult > 0)
+			{
+				puts("Error with servicing the server");
+				exit(EXIT_FAILURE);
+			}
+		}
+
+	}
+
+	enet_host_destroy(server);
+	enet_deinitialize();
+
+	return 0;
+
+}