diff --git a/rfudp/TxTunnel.h b/rfudp/TxTunnel.h
index 5acd3db..275a706 100644
--- a/rfudp/TxTunnel.h
+++ b/rfudp/TxTunnel.h
@@ -32,17 +32,18 @@
 // various functions and definitions
 #define eprintf(...) fprintf(stderr, __VA_ARGS__);
 
-#define FALSE (1 != 1)
-#define TRUE (!FALSE)
+#define FALSE   (1 != 1)
+#define TRUE    (!FALSE)
 
 
 // TxTunnel Congif
 #define SERVER_IP   "192.168.1.149"
 #define SERVER_PORT 8080
 #define MAX_MSG_SZ  32
-#define RF_CHANNEL 0
+#define RF_CHANNEL  0
+#define MILLIS_WAIT 200
 
-#define ACK_MODE FALSE
+#define ACK_MODE    FALSE
 
 // Radio pipe addresses for the 2 nodes to communicate.
 const uint8_t addresses[][5] = {"2RPi","0RPi"};
diff --git a/rfudp/TxTunnelSender.cpp b/rfudp/TxTunnelSender.cpp
index 0795019..7f080e6 100644
--- a/rfudp/TxTunnelSender.cpp
+++ b/rfudp/TxTunnelSender.cpp
@@ -6,10 +6,10 @@ TMRh20 2014
  version 2 as published by the Free Software Foundation.
  */
 
-/** General Data Transfer Rate Test
- * This example demonstrates basic data transfer functionality with the
- updated library. This example will display the transfer rates acheived using
- the slower form of high-speed transfer using blocking-writes.
+/** TxTunnelSender
+ * This programm acts as a middle layer between clients and a nRF24 antenna.
+ * It sends to the other node what it receive on the udp socket and answer the sender
+ * with whatever the node sends back.
  */
 
 #include "TxTunnel.h"
@@ -183,10 +183,10 @@ int main(int argc, char** argv){
 
         loop_start = millis();
         radio.startListening();
-        while ( !radio.available() && (millis() - loop_start) < 200) {
+        while ( !radio.available() && (millis() - loop_start) < MILLIS_WAIT) {
             // wait till receive or timeout
         }
-        if (millis() - loop_start >= 100) {
+        if (millis() - loop_start >= MILLIS_WAIT) {
             eprintf("Not Response.\n\r");
             strcpy(buffer,"TxERR\0");
             n=strlen(buffer);