diff --git a/main.cpp b/main.cpp
index 4b09e05..de78461 100644
--- a/main.cpp
+++ b/main.cpp
@@ -46,8 +46,17 @@ struct per_session_data__echo {
 	unsigned char buf[LWS_SEND_BUFFER_PRE_PADDING + MAX_ECHO_PAYLOAD + LWS_SEND_BUFFER_POST_PADDING];
 	unsigned int len;
 	unsigned int index;
+	int counter;
 };
 
+void scramble(unsigned char* str, unsigned int len){
+	unsigned int i = rand() % (len-1);
+	unsigned int j = i+1;
+	char t = str[i];
+	str[i] = str[j];
+	str[j] = t;
+}
+
 static int
 callback_echo(struct libwebsocket_context *context,
 		struct libwebsocket *wsi,
@@ -58,6 +67,8 @@ callback_echo(struct libwebsocket_context *context,
 
 	switch (reason) {
 		case LWS_CALLBACK_SERVER_WRITEABLE:
+			pss->counter++;
+			scramble(&pss->buf[LWS_SEND_BUFFER_PRE_PADDING], pss->len);
 			n = libwebsocket_write(wsi, &pss->buf[LWS_SEND_BUFFER_PRE_PADDING], pss->len, LWS_WRITE_TEXT);
 			if (n < 0) {
 				lwsl_err("ERROR %d writing to socket, hanging up\n", n);
@@ -101,8 +112,7 @@ static struct libwebsocket_protocols protocols[] = {
 	}
 };
 
-void sighandler(int sig)
-{
+void sighandler(int sig){
 	force_exit = 1;
 }
 
diff --git a/run b/run
index 3e5983b..de5b4a3 100755
--- a/run
+++ b/run
@@ -3,7 +3,7 @@
 mkdir -p build
 cd build
 cmake ..
-make -j8
+make -j8 || exit 1
 cd ..
 
 ./build/server