thread safety in newlib, newer lwip, optimized ISR for UART, some more stuff

mission/main.cpp

@@ -143,6 +143,7 @@ XScuWdt xWatchDogInstance;
 other modules. */
 XScuGic xInterruptController;
 
+extern SemaphoreHandle_t malloc_mutex;
 
 /*-----------------------------------------------------------*/
 void mission(void *);
@@ -154,6 +155,12 @@ int main(void) {
 
   printf("Booting Software\n");
 
+  malloc_mutex = xSemaphoreCreateRecursiveMutex();
+  if (malloc_mutex == NULL) {
+    printf("Could not obtaiin malloc mutex, bye...\n");
+    exit(-1);
+  }
+
   int taskParameters  =0;
 
   xTaskCreate(