diff --git a/modem_teszt/modem_teszt.ino b/modem_teszt/modem_teszt.ino
index 338b8d4..bfc0607 100644
--- a/modem_teszt/modem_teszt.ino
+++ b/modem_teszt/modem_teszt.ino
@@ -13,6 +13,8 @@ int socket;
 int pending;
 char * buffer;
 
+int sendResult = 0;
+
 void setup() {
   buffer = static_cast<char*>(malloc(250));
   DEBUG_STREAM.begin(DEBUG_STREAM_BAUD);
@@ -30,21 +32,24 @@ void setup() {
   nbiot.connectSocket();
 
   socket = nbiot.createSocket(1313);
-  DEBUG_STREAM.print("socket: ");
-  DEBUG_STREAM.println(socket);
 }
 
 
 void loop() {
-  DEBUG_STREAM.println("loop() start");
-  nbiot.sendSocket(socket, "87.229.111.223", 1111, "asdf", 4);
+  DEBUG_STREAM.println(F(__FILE__":loop() start"));
+  sendResult = nbiot.sendSocket(socket, "87.229.111.223", 1111, "asdf", 4);
+  DEBUG_STREAM.print(F(__FILE__":loop() sent:"));
+  DEBUG_STREAM.println(sendResult);
+
+  delay(2000);
 
   pending = nbiot.socketBytesPending(socket);
   if(pending > 0) {
+    DEBUG_STREAM.println(F(__FILE__":loop() got pending"));
     nbiot.socketReceive(socket, buffer, pending);
     DEBUG_STREAM.println(buffer);
   }
 
-  DEBUG_STREAM.println("loop() delay");
-  delay(5000);
+  DEBUG_STREAM.println(F(__FILE__":modem_teszt.ino:loop() delay"));
+  delay(2000);
 }