Added a lock-free queue to lwIP driver for RX packet processing. Added checks to force strict ordering of callback events

src/lwipDriver.hpp

@@ -77,6 +77,11 @@ void lwip_hibernate_driver();
  */
 void lwip_wake_driver();
 
+/**
+ * Returns whether the lwIP network stack is up and ready to process traffic
+ */
+bool lwip_is_up();
+
 /**
  * @brief Initialize network stack semaphores, threads, and timers.
  *