diff --git a/kraftsensor.c b/kraftsensor.c
index 7d4a289..2371f2a 100644
--- a/kraftsensor.c
+++ b/kraftsensor.c
@@ -27,13 +27,18 @@ void kraftsensor_init(){
 void do_kraftsensor(){
     uint16_t m_data[4];
 
+    /* read 2 16bit values and merge to 32bit signed integer */
     readReg(1,0,2);
-    if(wait_receive(2, m_data, 10))
+    if(wait_receive(2, m_data, 10)){
         kraftsensor_valid = 0;
+        printf("modbus error\n\r");
+    }
     else{
         kraftsensor_valid = 1;
         int32_t tmp = (uint32_t)m_data[0]<<16;
         tmp |= m_data[1];
+
+        /* conversion magic to milliNewton */
         kraftsensor_value = ((tmp + 539363)*9.81)/177.380;
     }
 
@@ -50,7 +55,6 @@ uint8_t wait_receive(uint8_t len, uint16_t dest[], uint8_t timeout){
     if(receiveOkay) { //if this fails, there was either no response or a crc error
         if(rxbuffer[1]&0x80) { //client responded with an error code
             //handle the error
-            printf("error\n\r");
             return -1;
         }
         else {
diff --git a/main.c b/main.c
index 9f75e1b..2ffce4f 100644
--- a/main.c
+++ b/main.c
@@ -64,7 +64,6 @@ static void avr_init()
     wdt_reset(); // wdt reset ~ every <2000ms
 
     timer0_init();// Timer0 millis engine init
-    //timer3_init();
     uart_init();
 
     sei(); //re-enable global interrupts
@@ -148,7 +147,7 @@ int main()
         while(1); //Reboot the board
     }
 
-    char SubString[] = "/Filamentanlage/04_Messmodul/set/#";
+    char SubString[] = "/Filamentanlage/05_Abzug/set/#";
     mqtt_rc = MQTTSubscribe(&mqtt_client, SubString, QOS0, messageArrived);
     printf("Subscribed (%s) %ld\r\n", SubString, mqtt_rc);
 #endif
diff --git a/uart.c b/uart.c
index aa928c8..6941792 100644
--- a/uart.c
+++ b/uart.c
@@ -50,4 +50,3 @@ void read_sync(char buffer[], uint8_t buffersize, uint8_t * bufferindex){
     putchar('\n');
 }
 
-