Add unit tests for buttons / relays; and a bunch of mocks :)

unittest/mgos_net.h

@@ -0,0 +1,32 @@
+#ifndef __MGOS_NET_H
+#define __MGOS_NET_H
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netdb.h>
+
+#define MGOS_NET_IF_WIFI_STA 0
+#define MGOS_NET_IF_WIFI_AP 1
+
+enum mgos_net_if_type {
+  MGOS_NET_IF_TYPE_WIFI,
+  MGOS_NET_IF_TYPE_ETHERNET,
+  MGOS_NET_IF_TYPE_PPP,
+  /* This is a sentinel in case all networking interface types are disabled. */
+  MGOS_NET_IF_MAX,
+};
+
+struct mgos_net_ip_info {
+  struct sockaddr_in ip;
+  struct sockaddr_in netmask;
+  struct sockaddr_in gw;
+};
+
+bool mgos_net_get_ip_info(enum mgos_net_if_type if_type, int if_instance,
+                          struct mgos_net_ip_info *ip_info);
+
+
+void mgos_net_ip_to_str(const struct sockaddr_in *sin, char *out);
+
+
+#endif // __MGOS_NET_H