Start to work on networking

esp32_device/main/unsecure_api.c

@@ -0,0 +1,11 @@
+#include "unsecure_api.h"
+#include "constants.h"
+#include "esp_http_client.h"
+
+#include <string.h>
+
+char *unsecure_api_get_secure_origin()
+{
+    const char *url = BACKEND_UNSECURE_URL "/secure_origin";
+    return strdup(url);
+}