diff --git a/include/main.h b/include/main.h
index c93e5f4..864f8bc 100644
--- a/include/main.h
+++ b/include/main.h
@@ -38,12 +38,13 @@ extern "C" {
 /* USER CODE BEGIN ET */
 RTC_HandleTypeDef hrtc;
 
-TIM_HandleTypeDef htim2;
-
 SPI_HandleTypeDef hspi1;
 
+TIM_HandleTypeDef htim2;
+
 UART_HandleTypeDef huart1;
 UART_HandleTypeDef huart2;
+
 /* USER CODE END ET */
 
 /* Exported constants --------------------------------------------------------*/
@@ -66,6 +67,10 @@ void Error_Handler(void);
 /* Private defines -----------------------------------------------------------*/
 #define LED_Pin GPIO_PIN_1
 #define LED_GPIO_Port GPIOA
+#define USART2_TX_Pin GPIO_PIN_2
+#define USART2_TX_GPIO_Port GPIOA
+#define USART2_RX_Pin GPIO_PIN_3
+#define USART2_RX_GPIO_Port GPIOA
 #define NSS_Pin GPIO_PIN_4
 #define NSS_GPIO_Port GPIOA
 #define RST_Pin GPIO_PIN_9
@@ -79,6 +84,11 @@ void Error_Handler(void);
 #define DIO2_Pin GPIO_PIN_5
 #define DIO2_GPIO_Port GPIOB
 #define DIO2_EXTI_IRQn EXTI4_15_IRQn
+#define USART1_TX_Pin GPIO_PIN_6
+#define USART1_TX_GPIO_Port GPIOB
+#define USART1_RX_Pin GPIO_PIN_7
+#define USART1_RX_GPIO_Port GPIOB
+
 /* USER CODE BEGIN Private defines */
 
 /* USER CODE END Private defines */
diff --git a/src/main.c b/src/main.c
index 547dcf1..3cf5b62 100644
--- a/src/main.c
+++ b/src/main.c
@@ -41,7 +41,7 @@
 /* Private define ------------------------------------------------------------*/
 /* USER CODE BEGIN PD */
 
-#define BUFFER_SIZE 2048
+#define BUFFER_SIZE 1024
 
 /* USER CODE END PD */
 
@@ -70,6 +70,8 @@ static void MX_RTC_Init(void);
 /* Private user code ---------------------------------------------------------*/
 /* USER CODE BEGIN 0 */
 
+uint8_t sml_frame[BUFFER_SIZE];
+
 double T1Wh = -2, SumWh = -2;
 
 typedef struct {
@@ -247,18 +249,10 @@ void initfunc (osjob_t* j) {
 
 }
 
-const uint8_t sml_frame[BUFFER_SIZE] = {"Hallo Welt !!\n"};
 
 u2_t readsensor(){
   u2_t value = 0xDF;    /// read from evrything ...make your own sensor
 
-  HAL_UART_Transmit( &huart2, (uint8_t *)sml_frame, 8, HAL_MAX_DELAY ); 
-  // if( HAL_UART_Receive( &huart2, sml_frame, 8, 15 )  == (HAL_OK || HAL_TIMEOUT)){
-  //   for(int i = 0; i < BUFFER_SIZE; i++){
-  //     readByte( &sml_frame[i]  );  
-  //   };
-  // } 
-
 	return value;
 }
 
@@ -269,7 +263,7 @@ static void reportfunc (osjob_t* j) {
     // read sensor
     u2_t val = readsensor();
     // debug_int( os_getTime() );
-    debug_val(": val = ", val);
+    debug_val("val = ", val);
     // prepare and schedule data for transmission
     LMIC.frame[0] = val << 8;
     LMIC.frame[1] = val;
@@ -278,6 +272,30 @@ static void reportfunc (osjob_t* j) {
     // os_setTimedCallback(j, os_getTime()+sec2osticks(300), reportfunc);
 }
 
+static osjob_t testjob;
+
+static void testfunc( osjob_t *j){
+  // uint32_t ticks;
+  // ticks = HAL_GetTick();
+  // debug_str( (const char*)sml_frame );
+  // debug_val("Ticks: ",  ticks );
+  for( int i = 0; i < sizeof(sml_frame); i++ ){
+    sml_frame[i] = 0u;
+  };
+  HAL_UART_Receive( &huart2, sml_frame, 512, 2000 );
+  // HAL_UART_Transmit( &huart1, sml_frame, 512, HAL_MAX_DELAY );
+  for(int i = 0; i < 512; i++){
+    readByte( &sml_frame[i] );  
+  };
+  // debug_str( "\r\n" );
+  
+  os_setTimedCallback(j, os_getTime()+sec2osticks(10), testfunc);
+
+}
+
+    
+    
+
 //////////////////////////////////////////////////
 // LMIC EVENT CALLBACK
 //////////////////////////////////////////////////
@@ -415,7 +433,7 @@ int main(void)
   // setup initial job
   os_setCallback(&initjob, initfunc);
   // execute scheduled jobs and events
-  // os_setTimedCallback(&testjob, os_getTime()+sec2osticks(1), testfunc);
+  os_setTimedCallback(&testjob, os_getTime()+sec2osticks(10), testfunc);
   // os_setTimedCallback(&reportjob, os_getTime()+sec2osticks(300), reportfunc);
   os_runloop();
   // (not reached)
@@ -717,7 +735,9 @@ static void MX_USART2_UART_Init(void)
   huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
   huart2.Init.OverSampling = UART_OVERSAMPLING_16;
   huart2.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
-  huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
+  huart2.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_RXOVERRUNDISABLE_INIT|UART_ADVFEATURE_DMADISABLEONERROR_INIT;
+  huart2.AdvancedInit.OverrunDisable = UART_ADVFEATURE_OVERRUN_DISABLE;
+  huart2.AdvancedInit.DMADisableonRxError = UART_ADVFEATURE_DMA_DISABLEONRXERROR;
   if (HAL_UART_Init(&huart2) != HAL_OK)
   {
     Error_Handler();
diff --git a/src/stm32l0xx_hal_msp.c b/src/stm32l0xx_hal_msp.c
index 328baf2..4a47677 100644
--- a/src/stm32l0xx_hal_msp.c
+++ b/src/stm32l0xx_hal_msp.c
@@ -273,12 +273,19 @@ void HAL_UART_MspInit(UART_HandleTypeDef* huart)
     PB6     ------> USART1_TX
     PB7     ------> USART1_RX
     */
-    GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7;
+    GPIO_InitStruct.Pin = USART1_TX_Pin;
     GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
     GPIO_InitStruct.Pull = GPIO_NOPULL;
-    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
     GPIO_InitStruct.Alternate = GPIO_AF0_USART1;
-    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
+    HAL_GPIO_Init(USART1_TX_GPIO_Port, &GPIO_InitStruct);
+
+    GPIO_InitStruct.Pin = USART1_RX_Pin;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_PULLUP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
+    GPIO_InitStruct.Alternate = GPIO_AF0_USART1;
+    HAL_GPIO_Init(USART1_RX_GPIO_Port, &GPIO_InitStruct);
 
   /* USER CODE BEGIN USART1_MspInit 1 */
 
@@ -297,12 +304,19 @@ void HAL_UART_MspInit(UART_HandleTypeDef* huart)
     PA2     ------> USART2_TX
     PA3     ------> USART2_RX
     */
-    GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_3;
+    GPIO_InitStruct.Pin = USART2_TX_Pin;
     GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
     GPIO_InitStruct.Pull = GPIO_NOPULL;
-    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
     GPIO_InitStruct.Alternate = GPIO_AF4_USART2;
-    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+    HAL_GPIO_Init(USART2_TX_GPIO_Port, &GPIO_InitStruct);
+
+    GPIO_InitStruct.Pin = USART2_RX_Pin;
+    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
+    GPIO_InitStruct.Pull = GPIO_PULLUP;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
+    GPIO_InitStruct.Alternate = GPIO_AF4_USART2;
+    HAL_GPIO_Init(USART2_RX_GPIO_Port, &GPIO_InitStruct);
 
   /* USER CODE BEGIN USART2_MspInit 1 */
 
@@ -331,7 +345,7 @@ void HAL_UART_MspDeInit(UART_HandleTypeDef* huart)
     PB6     ------> USART1_TX
     PB7     ------> USART1_RX
     */
-    HAL_GPIO_DeInit(GPIOB, GPIO_PIN_6|GPIO_PIN_7);
+    HAL_GPIO_DeInit(GPIOB, USART1_TX_Pin|USART1_RX_Pin);
 
   /* USER CODE BEGIN USART1_MspDeInit 1 */
 
@@ -349,7 +363,7 @@ void HAL_UART_MspDeInit(UART_HandleTypeDef* huart)
     PA2     ------> USART2_TX
     PA3     ------> USART2_RX
     */
-    HAL_GPIO_DeInit(GPIOA, GPIO_PIN_2|GPIO_PIN_3);
+    HAL_GPIO_DeInit(GPIOA, USART2_TX_Pin|USART2_RX_Pin);
 
   /* USER CODE BEGIN USART2_MspDeInit 1 */