diff --git a/platform/posix/btstack_uart_posix.c b/platform/posix/btstack_uart_posix.c
index 9aa79c19e..efb1d71b8 100644
--- a/platform/posix/btstack_uart_posix.c
+++ b/platform/posix/btstack_uart_posix.c
@@ -90,7 +90,7 @@ static int btstack_uart_posix_init(const btstack_uart_config_t * config){
 static void hci_uart_posix_process(btstack_data_source_t *ds, btstack_data_source_callback_type_t callback_type);
 
 static void btstack_uart_block_posix_process_write(btstack_data_source_t *ds) {
-    
+
     if (btstack_uart_block_write_bytes_len == 0) return;
 
     uint32_t start = btstack_run_loop_get_time_ms();
@@ -135,7 +135,7 @@ static void btstack_uart_block_posix_process_read(btstack_data_source_t *ds) {
     }
 
     uint32_t start = btstack_run_loop_get_time_ms();
-    
+
     // read up to bytes_to_read data in
     ssize_t bytes_read = read(ds->source.fd, btstack_uart_block_read_bytes_data, btstack_uart_block_read_bytes_len);
     // log_info("read need %u bytes, got %d", btstack_uart_block_read_bytes_len, (int) bytes_read);
@@ -145,17 +145,17 @@ static void btstack_uart_block_posix_process_read(btstack_data_source_t *ds) {
     }
     if (bytes_read == 0){
         log_error("read zero bytes\n");
-        return;
+        exit(EXIT_FAILURE);
     }
     if (bytes_read < 0) {
         log_error("read returned error\n");
-        return;
+        exit(EXIT_FAILURE);
     }
 
     btstack_uart_block_read_bytes_len   -= bytes_read;
     btstack_uart_block_read_bytes_data  += bytes_read;
     if (btstack_uart_block_read_bytes_len > 0) return;
-    
+
     btstack_run_loop_disable_data_source_callbacks(ds, DATA_SOURCE_CALLBACK_READ);
 
     if (block_received){
@@ -176,13 +176,13 @@ static int btstack_uart_posix_set_baudrate(uint32_t baudrate){
         case    9600: brate=B9600;    break;
         case   19200: brate=B19200;   break;
         case   38400: brate=B38400;   break;
-        case 57600:  brate=B57600;  break;
-        case 115200: brate=B115200; break;
+        case   57600: brate=B57600;   break;
+        case  115200: brate=B115200;  break;
 #ifdef B230400
-        case 230400: brate=B230400; break;
+        case  230400: brate=B230400;  break;
 #endif
 #ifdef B460800
-        case 460800: brate=B460800; break;
+        case  460800: brate=B460800;  break;
 #endif
 #ifdef B500000
         case  500000: brate=B500000;  break;
@@ -191,7 +191,7 @@ static int btstack_uart_posix_set_baudrate(uint32_t baudrate){
         case  576000: brate=B576000;  break;
 #endif
 #ifdef B921600
-        case 921600: brate=B921600; break;
+        case  921600: brate=B921600;  break;
 #endif
 #ifdef B1000000
         case 1000000: brate=B1000000; break;
@@ -311,12 +311,12 @@ static int btstack_uart_posix_open(void){
     int fd = open(device_name, flags);
     if (fd == -1)  {
         log_error("Unable to open port %s", device_name);
-        return -1;
+        exit(EXIT_FAILURE);
     }
-    
+
     if (tcgetattr(fd, &btstack_uart_block_termios) < 0) {
         log_error("Couldn't get term attributes");
-        return -1;
+        exit(EXIT_FAILURE);
     }
     cfmakeraw(&btstack_uart_block_termios);   // make raw
 
@@ -326,11 +326,11 @@ static int btstack_uart_posix_open(void){
 
     btstack_uart_block_termios.c_cflag |= CREAD | CLOCAL;  // turn on READ & ignore ctrl lines
     btstack_uart_block_termios.c_iflag &= ~(IXON | IXOFF | IXANY); // turn off s/w flow ctrl
-    
+
     // see: http://unixwiz.net/techtips/termios-vmin-vtime.html
     btstack_uart_block_termios.c_cc[VMIN]  = 1;
     btstack_uart_block_termios.c_cc[VTIME] = 0;
-    
+
     // no parity
     btstack_uart_posix_set_parity_option(&btstack_uart_block_termios, parity);
 
@@ -339,15 +339,15 @@ static int btstack_uart_posix_open(void){
 
     if(tcsetattr(fd, TCSANOW, &btstack_uart_block_termios) < 0) {
         log_error("Couldn't set term attributes");
-        return -1;
+        exit(EXIT_FAILURE);
     }
 
     // store fd in data source
     transport_data_source.source.fd = fd;
-    
+
     // also set baudrate
     if (btstack_uart_posix_set_baudrate(baudrate) < 0){
-        return -1;
+        exit(EXIT_FAILURE);
     }
 
     // set up data_source
@@ -360,13 +360,13 @@ static int btstack_uart_posix_open(void){
 
     log_info("Open tty %s", device_name);
     return 0;
-} 
+}
 
 static int btstack_uart_posix_close_new(void){
 
     // first remove run loop handler
     btstack_run_loop_remove_data_source(&transport_data_source);
-    
+
     // then close device 
     close(transport_data_source.source.fd);
     transport_data_source.source.fd = -1;
@@ -434,7 +434,7 @@ static void (*frame_received)(uint16_t frame_size);
 static void btstack_uart_slip_posix_block_sent(void);
 
 static void btstack_uart_slip_posix_process_write(btstack_data_source_t *ds) {
-    
+
     if (btstack_uart_slip_write_bytes_len == 0) return;
 
     uint32_t start = btstack_run_loop_get_time_ms();
@@ -507,7 +507,7 @@ static void btstack_uart_slip_posix_process_read(btstack_data_source_t *ds) {
         btstack_uart_slip_receive_track_start = 0;
         btstack_uart_slip_receive_start_time = start;
     }
-    
+
     // read up to bytes_to_read data in
     ssize_t bytes_read = read(ds->source.fd, btstack_uart_slip_receive_buffer, SLIP_RECEIVE_BUFFER_SIZE);
 
@@ -517,7 +517,7 @@ static void btstack_uart_slip_posix_process_read(btstack_data_source_t *ds) {
         log_info("read took %u ms", end - start);
     }
     if (bytes_read < 0) return;
-    
+
     btstack_uart_slip_receive_pos = 0;
     btstack_uart_slip_receive_len = (uint16_t ) bytes_read;